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1.
Guirong Peng Haifeng Wang Haiyan Wang Qiuyun Liu Wenguang Hao 《Journal of Polymers and the Environment》2009,17(3):159-164
Carbonyl iron/epoxy coatings are widely used in military as a radar absorbing coating (RAC). The behaviors of RACs under working
environments are very important, especially in the new environments such as ozone appeared with widening of the application
fields. The effects of ozone degradation on pure epoxy cured with anhydride and the influence of carbonyl Fe on the degradation
of epoxy are studied. The results indicate that if the peak at 1,510 cm−1 was used as the inner standard, the intensity of absorption peaks at 1,738, 1,247 and 1,182 cm−1 increases with exposure time for pure epoxy resin, while for the carbonyl iron/epoxy coatings, the three peaks changes insignificantly
with the exposure time. The results indicates the oxidation process begins at the hydroxyl and methyl groups, and finally
ozonide and carbonyl are formed on the surface for pure epoxy, and epoxy is eroded gradually in depth by ozone. Carbonyl iron
could hinder the meeting of ozone with epoxy with dilution or hindrance effect and could protect epoxy resin from ozone and
thus delay the deterioration of the coating performance. 相似文献
2.
Tadeusz Spychaj Ewa Fabrycy Stanislawa Spychaj Michal Kacperski 《Journal of Material Cycles and Waste Management》2001,3(1):24-31
This paper describes the chemical degradation of waste poly(ethylene terephthalate) (PET) with polyamines or triethanolamine,
the characteristics of the products, and a search for ways to use these products. Solvolysis of the polymer ester bonds was
caused by diethylenetriamine, triethylenetetramine, and their mixtures, as well as mixtures of triethylenetetramine and p-phenylenediamine or triethanolamine. Products of aminolysis or aminoglycolysis of PET obtained in reactions performed at
200–210°C (with a molar ratio of the recurrent polymer unit to amine of 1 : 2) have been characterized using nuclear magnetic
resonance (NMR). Viscosity and hydroxyl number measurements have been done for PET/triethanolamine products. Substances from
aminolytical reactions with polyamines were tested as hardeners for liquid epoxy resins, and the product of polymer aminoglycolysis
with triethanolamine was tested as an epoxy resin hardener, e.g., for water-borne paints, and a polyol component for rigid
polyurethane foams. The compositions of epoxy resin hardeners have been characterized using DSC and rheometry. Comparative
analyses of the hardened epoxy materials have been done on the basis of glass temperature and mechanical properties data,
as well as some specific properties of the coating materials and rigid polyurethane foams.
Received: September 15, 2000 / Accepted: September 21, 2000 相似文献
3.
Biodegradable Polyester-Based Blend Reinforced with Curauá Fiber: Thermal,Mechanical and Biodegradation Behaviour 总被引:1,自引:1,他引:0
Fernanda Harnnecker Derval dos Santos Rosa Denise Maria Lenz 《Journal of Polymers and the Environment》2012,20(1):237-244
Biodegradable composites can be produced by the combination of biodegradable polymers (BP) as matrix and vegetal fibers as
reinforcement. Composites of a commercial biodegradable polymer blend and curauá fibers (loaded at 5, 15 and 20 wt%) were
prepared by melt mixing in a twin-screw extruder. Chemical treatments such as alkali treatment of the fiber and addition of
maleic anhydride grafted polypropylene (MA-g-PP) as coupling agent were performed to promote polymer/fiber interfacial adhesion so that mechanical performance can be
improved. The resulting composites were evaluated through hardness, melt flow index and tensile, flexural and impact strengths
as well as water absorption. Thermal analysis and Fourier transform infrared spectroscopy were also employed to characterize
the composites. The polymer/fiber interface was investigated through scanning electron microscopy analysis. The biodegradability
of composites was evaluated by compost-soil burial test. The addition of curauá fiber promoted an increase in the mechanical
strengths and composites treated with 2 wt% MA-g-PP with 20 wt% curauá fiber showed an increase of nearly 75% in tensile and 56% in flexural strengths besides an improvement
in impact strength with respect to neat polymer blend. Nevertheless, treated composites showed an increase in water absorption
and biodegradation tests showed that the addition of fiber retards degradation time. The retained mass of BP/20 wt% fiber
composite with MA-g-PP and neat BP was 68 and 26%, respectively, after 210 days of degradation test. 相似文献
4.
Yue Zhang Hongsheng Zhang Luping Ni Qilin Zhou Weihong Guo Chifei Wu 《Journal of Polymers and the Environment》2010,18(4):647-653
Recycled poly(ethylene terephthalate) (R-PET) was blended with 15–30 wt% of styrene–ethylene/butylenes–styrene (SEBS) block
copolymer and maleic anhydride grafted SEBS (SEBS-g-MA). Effects of nucleation and toughening of the elastomers were evaluated
systematically by study of morphology, crystallization, thermal and mechanical properties of the blend. The addition of 30 wt%
SEBS promoted the formation of co-continuous structure of the blend and caused the fracture mechanism to change from strain
softening to strain hardening. Addition of SEBS-g-MA resulted in significant modification of phase morphology and obviously
improved the impact strength. The compatibilization reaction of PET with SEBS-g-MA accelerated the crystallization of PET
and increased the crystallinity. The shifts in glass transition temperature of PET towards that of SEBS-g-MA and the higher
modulus for R-PET/SEBS-g-MA (70/30) blend found by DMA are also indications of better interactions under the conditions of
compatibilization and interpenetrating structure. 相似文献
5.
Ariyanti Sarwono Zakaria Man M. Azmi Bustam 《Journal of Polymers and the Environment》2012,20(2):540-549
Epoxy resin prepared by the reaction of a diglycidyl ether of bisphenol A (DGEBA) and m-xylylenediamine (m-XDA) was modified with 10% wt of epoxidized palm oil (EPO). The EPO was first pre-polymerized with m-XDA at various temperatures and reaction times. The resulting product was then mixed with the epoxy resin at 40?°C and allowed to react at 120?°C for another 3?h. The fully reacted DGEBA/m-XDA/EPO blend was characterized by using scanning electron microscopy (SEM), differential scanning calorimetry (DSC), thermal gravimetric analysis, tensile test, hardness indentation and dynamic mechanical analysis. The SEM study shows that different types of morphology, ranging from phase separated to miscible blends were obtained. A miscible blend was obtained when the m-XDA and EPO were reacted for more than 2?h. The results from DSC analysis show that the incorporation of EPO at 10% wt in the epoxy blend reduced the glass transition temperature (T g). The lowered T g and mechanical properties of the modified epoxy resins are caused by a reduction in crosslinking density and plasticizer effect. 相似文献
6.
Wan-Lan Chai Jing-Dong Chow Chien-Chung Chen Fu-Sheng Chuang Wei-Chuan Lu 《Journal of Polymers and the Environment》2009,17(2):71-82
Polyvinyl alcohol (PVA) and starch are both biodegradable polymers. These two polymers can be prepared as biodegradable plastics
that are emerging as one of the environmental friendly materials available now. In this study, after reacting with sodium
trimetaphosphate (STMP), modified corn starch was blended with PVA in different ratios by a barbender. Test samples were prepared
for mechanical and thermal properties measurements. The surface roughness and morphology of fractured surface of the samples
were observed by an atomic force microscopy (AFM) and scanning electron microscope (SEM) measurements. Aqueous degradation
by enzyme, water absorption and biodegradability behavior were evaluated for the degradability. The biodegradability of these
materials was followed by bio-reactivity kinetics models. Results showed that the addition of modified starch could enhance
its water uptake. With an addition of 20 wt% of modified starch, the blend had a maximum weight loss during enzymatic degradation.
It was found that the degradability was enhanced with the addition of the starch. Analyzing the results of the biodegradability
based on the kinetic models, the growth rate of the microorganism was found to be increasing with the increase of the content
of starch in the PVA/starch blends in the first order reaction fashion. In our biodegradability analysis, i.e., based on the
China national standards (CNS) 14432 regulations, we estimated the decomposition behavior based on the mentioned first order
reaction. We found that the PVA/starch blends would take 32.47, 16.20 and 12.47 years to degrade by 70% as their starch content
0, 20 and 40 wt%, respectively. 相似文献
7.
Suvangshu Dutta Niranjan Karak Jyoti Prasad Saikia Bolin Kumar Konwar 《Journal of Polymers and the Environment》2010,18(3):167-176
Mesua ferrea L. seed oil (MFLSO) modified polyurethanes blends with epoxy and melamine formaldehyde (MF) resins have been studied for
biodegradation with two techniques, namely microbial degradation (broth culture technique) and natural soil burial degradation.
In the former technique, rate of increase in bacterial growth in polymer matrix was monitored for 12 days via a visible spectrophotometer
at the wavelength of 600 nm using McFarland turbidity as the standard. The soil burial method was performed using three different
soils under ambient conditions over a period of 6 months to correlate with natural degradation. Microorganism attack after
the soil burial biodegradation of 180 days was realized by the measurement of loss of weight and mechanical properties. Biodegradation
of the films was also evidenced by SEM, TGA and FTIR spectroscopic studies. The loss in intensity of the bands at ca. 1735 cm−1 and ca. 1050 cm−1 for ester linkages indicates biodegradation of the blends through degradation of ester group. Both microbial and soil burial
studies showed polyurethane/epoxy blends to be more biodegradable than polyurethane/MF blends. Further almost one step degradation
in TG analysis suggests degradation for both the blends to occur by breakage of ester links. The biodegradation of the blends
were further confirmed by SEM analyses. The study reveals that the modified MFLSO based polyurethane blends deserve the potential
to be applicable as “green binders” for polymer composite and surface coating applications. 相似文献
8.
K. Abdel Tawab M. M. Magida Sayeda M. Ibrahim 《Journal of Polymers and the Environment》2011,19(2):440-446
Blends of water—soluble polymers based on Poly vinyl alcohol (PVA) and Polyethylene glycol (PEG) have been prepared by the
solution casting technique. The effect of various doses of γ-radiation on the structural properties of PVA/PEG polymer blends
with all its compositions has been investigated. From the visual observation of all the blend compositions, it was found that,
the best compatibility of the blend is up to 40% PVA/60%PEG. The structure–Property behavior of all the prepared blends before
and after γ-irradiation was investigated by IR Spectroscopy, thermogravimetric analysis (TGA), mechanical properties and Scanning
electron microscope (SEM). The gel content and the swelling behavior of the PVA/PEG blends were investigated. It was found
that the gel content increases with increasing irradiation dose and PVA concentration in the blend. Swelling percent increased
as the composition of PEG increased in the blend. The results obtained by FTIR analysis and SEM confirm the existence of possible
interaction between PVA and PEG homopolymers. TGA of PVA/PEG blend, before and after γ-irradiation, showed that the unirradiated
and irradiated PVA/PEG blends are more stable against thermal decomposition than pure PVA. Improvement in tensile mechanical
properties of PVA/PEG blends was occurred. 相似文献
9.
Yeon-Hum Yun Young-Jung Wee Hun-Soo Byun Soon-Do Yoon 《Journal of Polymers and the Environment》2008,16(1):12-18
Biodegradable films were successfully prepared by using cornstarch (CS), chemically modified starch (RS4), polyvinyl alcohol
(PVA), glycerol (GL), and citric acid (CA). The physical properties and biodegradability of the films using CS, RS4, and additives
were investigated. The results of the investigation revealed that the RS4-added film was better than the CS-added film in
tensile strength (TS), elongation at break (%E), swelling behavior (SB) and solubility (S). Especially, the RS4/PVA blend film with CA as an additive showed physical properties superior to other films. Furthermore,
when the film was dried at low temperature, the properties of the films clearly improved because the hydrogen bonding was
activated at low temperature. The biodegradation of films was carried out using the enzymatic, microbiological and soil burial
test. The enzyme used in this study was amyloglucosidase (AMG), α-amylase (α-AM) and β-amylase (β-AM). At the enzymatic degradation
test, the GL-added films had an approximately 60% degradation, while the CA-added films were degraded about 25%. The low degradation
value on CA-added film is attributed to low pH of film added CA that deactivated the enzymatic reaction. The microbiological
degradation teat was performed by using Bacillus subtilis and Aspergillus niger. 相似文献
10.
Maurizio Avella Luigi Calandrelli Barbara Immirzi Mario Malinconico Ezio Martuscelli Beniamino Pascucci Patrizia Sadocco 《Journal of Polymers and the Environment》1995,3(1):49-60
The biodegradability of a multicomponent system based on biotechnological occurring polyester (poly(-hydroxybutyrate-co--hydroxyvalerate) (PHBV)) with inclusion of acrylate elastomer (polybutylacrylate) (PBA) was investigated. A bacterium which produced extracellular enzymes that degrades PHBV even when blended with PBA was isolated and tentatively designated asAureobacterium saperdae. It was observed, by morphological investigation, that, while the bacterial degradation was permitted for PBA content of 20% by weight, it was inhibited for PBA content of 30%, owing to the occurrence of a rubbery layer that prevents to the bacteria an easy accessibility in the PHBV-rich regions. In fact, owing the bacterial growth, only PHBV was metabolized, whereas no degradation of PBA was detected for blend samples. It was confirmed that the degradation proceeded via surface erosion of PHBV also in the blends. Finally, mechanical tests on PHBV/PBA specimens as a function of degradation extent have shown different behavior of the blends at different the PBA content. Thermal analysis of blends and PHBV has been reported, too 相似文献
11.
Physical properties and biodegradability of blends containing poly(ε-caprolactone) and tropical starches 总被引:1,自引:0,他引:1
Hardaning Pranamuda Yutaka Tokiwa Hideo Tanaka 《Journal of Polymers and the Environment》1996,4(1):1-7
In order to assess feasibility of tropical starches (sago and cassava starches) as biodegradable plastic materials, blending with poly(-caprolactone) (PCL), a biodegradable polymer, was carried out. It was confirmed that the physical properties (tensile strength and elongation) of PCL/sago and PCL/cassava blends were similar to those of PCL/corn blend, suggesting that sago and cassava starches can also be blended with PCL for production of biodegradable plastic. However, the properties of all PCL/starch blends were still low compared with those of polyethylene. Enzymatic degradability evaluation showed that lipase degradation of PCL and-amylase degradation of starch increased as the starch content in the blend increased. Burial test of the blends for 1, 3, and 5 months was carried out and the rate of degradation of the PCL/sago blend was confirmed to be slower than those of PCL/corn and PCL/cassava blends. Observation of the film blends structure by scanning electron microscope revealed that the starch was dispersed in a PCL continuous phase. Furthermore, changes in the film surface before and after enyzme treatments were observed. 相似文献
12.
Zhao Rongfang Ye Shufeng Xie Yusheng Chen Yunfa 《Journal of Material Cycles and Waste Management》2007,9(1):7-14
A new way to implement the simultaneous reutilization of solid waste, the desulfurization of coke oven gas (COG), and even
the desulfurization of coke by the co-coking of coking coal (CC) and waste plastic (WP) blended with a sorbent is proposed;
the evolution of H2S and the removal efficiency of H2S from COG during the co-coking process were investigated in a lab-scale cylindrical reactor. The experimental results indicated
that for the coking of CC blended with ZnO, Fe2O3, or blast furnace dust (BFD) as a sorbent, the instantaneous concentration of H2S in COG was lower than 500 mg/m3 (which meets the technical specification requirement of the Chinese Cleaner Production Standard–Coking Industry, HJ/T 126-2003)
when the molar ratio between the key component of the sorbent and the volatile S in CC or the CC/WP blend, n
Zn+Fe/n
S, was about 1.2 for ZnO and Fe2O3, but not for BFD under the same conditions, suggesting that ZnO and Fe2O3 are promising sorbents, but that BFD must be treated chemical or thermally before being used as a sorbent because of the
size and complicated nature of the influence of its phase/chemical composition on its desulfurization ability. However, for
the co-coking of CC and WP blended with ZnO as a sorbent, n
Zn+Fe/n
S must increase to 1.4 and 1.7 for 100/2 and 100/5 blends of CC/WP, respectively, to ensure a satisfactory efficiency for H2S removal from COG.
Part of this paper was presented at the International Symposium on EcoTopia Science 2005 (ISET05), Aug 8–9, 2005, Chikusa-ku,
Nagoya, Japan 相似文献
13.
Effect of Nucleating Agents on Physical Properties of Poly(lactic acid) and Its Blend with Natural Rubber 总被引:1,自引:0,他引:1
Poly(lactic acid) (PLA) presents high strength and modulus, but very low toughness as well as slow crystallization. Natural
rubber (NR) was blended to enhance the toughness and nucleating agent was added to improve the crystallization. Cyclodextrin
(CD), considered as a green compound, as well as calcium carbonate (CaCO3) and talc were used as nucleating agents. Effects of these nucleating agents on crystallization, mechanical properties and
morphology of neat PLA and PLA/NR blend were investigated. It was found that the addition of talc and CD decreased cold crystallization
temperature (Tcc) of the PLA. Same result was obtained in PLA/NR blend containing talc. All nucleating agents increased the degree of crystallinity
(ΧC) of PLA, whereas only talc and CaCO3 increased ΧC of PLA in PLA/NR blends. The enhanced toughness of PLA by the addition of nucleating agent was attributed to its increased
crystallinity, as well as decreased spherulite size. For PLA/NR blends, the increase in toughness was mainly contributed by
the presence of the rubber. 相似文献
14.
Haihong Huang Yanzhen Yin Huanbo Cheng Zhipei Zhao Baoyu Zhang 《Journal of Polymers and the Environment》2017,25(2):115-125
CF/EP (carbon fibre/epoxy resin) composites were degraded by supercritical n-butanol with alkali additive KOH in a batch reactor. The catalytic degradation mechanism of the composites was investigated based on the analysis of liquid phase products by GC–MS and solid phase products by FTIR. The results indicate that alkali additive (KOH) can promote Guerbet reaction and increase hydrogen donor capability of supercritical n-butanol. The H· can combine promptly with the free radical formed by the scission of linear and crosslinked chains in epoxy resin to generate the liquid products, including phenol, 4-isopropylphenol, 4-(2-methylallyl)phenol and other derivatives of benzene and phenol. The combination of supercritical n-butanol with alkali additive is an effective way to degrade and recycle CF/EP composites. 相似文献
15.
Yueqin Yu Lingxiu Liu Yanyan Kong Erchi Zhang Yanping Liu 《Journal of Polymers and the Environment》2011,19(4):926-934
A high-swelling superabsorbent was synthesized with biodegradable N-maleyl chitosan as cross-linker, acrylic acid (AA) and acrylamide (AM) as the monomers, ammonium peroxodisulfate–sodium bisulfite
(NaHSO3) as redox initiation system, by means of aqueous solution polymerization. The best reaction condition was based on the orthogonal
experiment design. The optimal conditions on distilled water absorbency and on 0.9 wt% NaCl solution absorbency were monomer
concentration 20 wt%, mole ratio of AA to (AA + AM) 60%, the neutralization degree of AA 40%, cross-linker concentration 2%
and monomer concentration 25 wt%, mole ratio of AA to (AA + AM) 60%, neutralization degree of AA 50% and cross-linker concentration
1%, respectively. Factors influencing the water absorbency of superabsorbent also were investigated, by single factor experiment
method. The absorbency of superabsorbents in distilled water and 0.9 wt% NaCl solution increased and then decreased with the
increasing of monomer concentration, mole ratio of AA to (AA + AM) and degree of neutralization of AA. With the increasing
of cross-linker concentration, the absorbency in distilled water increased and then decreased, but it decreased all the time
in 0.9 wt% NaCl solution. In enzymatic degradation tests, the weight loss of superabsorbent was related to the content of
cross-linker. 相似文献
16.
Kunichika Nakamiya Tohru Furuichi Kazuei Ishii 《Journal of Material Cycles and Waste Management》2002,4(2):127-134
This article reports the potential of denitrifying activated sludge to degrade highly chlorinated dioxins, especially from
a (landfill) leacheate treatment plant in Japan, and the isolation from this denitrifying activated sludge of a microorganism
able to degrade highly chlorinated dioxins. Using a 700-ml bioreactor, denitrifying activated sludge was cultivated under
denitrifying conditions by adding 2.0 ng of a mixture of 4- to 8-chlorinated dioxins from fly ash. The dioxin contents of
the sample, effluent, and medium before and after cultivation were measured by gas chromatography–mass spectrometry (GC–MS).
After 7 days cultivation, about 90% of added dioxins were lost (average percentage of isomer depletion). A dioxin-degrading
microorganism was isolated from the activated sludge. Lignin was added to the medium as a color indicator of aromatic compound
degradation, and the lignin-decolorizing microorganisms in the denitrifying activated sludge were screened. Some strains were
isolated, and one major isolated fungus, strain 622, decolorized lignin effectively. Strain 622 was identified as an Acremonium sp. from its morphological characteristics. It could decolorize lignin by 24% under paraffin-sealed anaerobic conditions.
After the cultivation of strain 622 with a 2 ng/ml mixture of 4- to 8-chlorinated dioxins for 1 day, 82% (average for individual
isomers) of the added 4- to 8-chlorinated dioxins had been degraded. Added octachlorodibenzo-p-dioxin (OCDD, 100 ng) was degraded under aerobic conditions after 8 h of incubation. During this process, heptachlorodibenzo-p-dioxin was produced and appeared to be a degradation product of OCDD. 1- or 2-hydroxydibenzo-p-dioxin from OCDD was also identified as the degradation product by GC–MS. These results indicated that OCDD was degraded
to the nonchlorinated dibenzo-p-dioxins through dechlorination by Acremonium sp. strain 622.
Received: October 12, 2001 / Accepted: March 11, 2002 相似文献
17.
Piotr Rutkowski 《Waste management (New York, N.Y.)》2009,29(12):2983-2993
The chemical structure of liquid products of the pinewood sawdust (W) co-pyrolysis with polystyrene (PS) and polypropylene (PP) with and without the zinc chloride as an additive was investigated. The pyrolysis process was carried out at 450 °C with the heating rate of 5 °C/min. The yield of liquid products of pyrolysis was in the range of 37–91 wt% and their form was liquid or semi-solid depending on the composition of the wood/polymer blend. The zinc chloride addition to wood/polymer blends has influenced the range of samples decomposition as well as the chemical structure of resulted bio-oils. All bio-oils from wood/polypropylene blends were two-phase (liquid and solid). Contrarily, all bio-oils obtained from biopolymer/polypropylene blends with zinc chloride added were yellow liquids. All analyses proved that the structure and the quality of bio-oil strongly depend on both the composition of the blend and the presence of ZnCl2 as an additive. The FT-IR analyses of oils showed that oxygen-containing groups and hydrocarbons content highly depend on the composition of biomass/synthetic polymer mixture. The fractionation of bio-oils by column chromatography with four different solvents was followed by GC–MS analysis. Results confirmed the significant removal and/or transformation of oxygen-containing organic compounds due to the zinc chloride presence during pyrolysis process. 相似文献
18.
Shogo Kumagai Guido Grause Tomohito Kameda Toshiaki Yoshioka 《Journal of Material Cycles and Waste Management》2014,16(2):282-290
Pure poly(ethylene terephthalate) (PET) resin and metal-/metal oxide-containing PET composites were thermally decomposed in the presence of Ca(OH)2 using a tube reactor. The effects of batch and continuous processing, the presence of Ca(OH)2, and PET size on benzene production were investigated. A maximum benzene yield and purity of 82.9 % and 78.8 wt%, respectively, were obtained at 700 °C in the presence of Ca(OH)2 when using small PET particles; further, a continuous feed reactor was favored over a batch reactor. Effective contact between PET and Ca(OH)2 was important in the PET degradation, which promoted hydrolysis of PET and decarboxylation of terephthalic acid, whereas pyrolysis was suppressed. Furthermore, the results of thermal decomposition of PET-based waste—PET-based X-ray films, magnetic tape, and prepaid cards—indicated that the metal and metal oxides contained in the waste had no significant catalytic effect on PET degradation or on the recovery of benzene-rich oil in the presence of Ca(OH)2. 相似文献
19.
The influence of poly(dioxolane) (PDXL), a poly(ethylene oxide-alt-methylene oxide), as compatibilizer on poly(ɛ-caprolactone) (PCL)/tapioca starch (TS) blends was studied. In order to facilitate blending; PCL, PDXL and TS must be blended together directly; so that PDXL is partially adhered at the TS surface as shown by scanning electron microscopy. The molecular weight effect of PDXL on the PCL/TS blends showed that mechanical properties of PCL/TS/PDXL blends from low molecular weight (M
n=10,000) and high molecular weight (M
n=200,000) PDXL were rather dependent on TS content. The enzymatic degradability of PCL/TS/PDXL blends using α-amylase increased as the TS content increased but was independent on the dispersion of tapioca starch in the PCL matrix. 相似文献
20.
Separation of waste printed circuit boards (WPCBs) has been a bottleneck in WPCBs resource processing. In this study, the separation of WPCBs was performed using dimethyl sulfoxide (DMSO) as a solvent. Various parameters, which included solid to liquid ratio, temperature, WPCB sizes, and time, were studied to understand the separation of WPCBs by dissolving bromine epoxy resin using DMSO. Experimental results showed that the concentration of dissolving the bromine epoxy resin increased with increasing various parameters. The optimum condition of complete separation of WPCBs was solid to liquid ratio of 1:7 and WPCB sizes of 16 mm2 at 145 °C for 60 min. The used DMSO was vapored under the decompression, which obtained the regenerated DMSO and dissolved bromine epoxy resin. This clean and non-polluting technology offers a new way to separate valuable materials from WPCBs and prevent the environmental pollution of waste printed circuit boards effectively. 相似文献