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The Effect of Nanoclays on the Properties of PLLA-modified Polymers Part 1: Mechanical and Thermal Properties 总被引:2,自引:0,他引:2
D. Lewitus S. McCarthy A. Ophir S. Kenig 《Journal of Polymers and the Environment》2006,14(2):171-177
Organically modified montmorillonite clays were incorporated at a 5% loading level into film grade of poly-L-lactic acid (PLLA) using a variety of masterbatches based on either semi-crystalline or amorphous poly-(lactic acid), as well as biodegradable aromatic aliphatic polyester. The PLLA masterbatches and compounded formulations were prepared using a twin screw compounding extruder, while the films were prepared using a single screw cast film extruder. The thermal and mechanical properties of the films were examined in order to determine the effect of the clay and different carriers on the polymer–clay interactions. In the optimal case, when a PLLA-based masterbatch was used, the tensile modulus increased by 30%, elongation increased by 40%, and the cold crystallization temperature decreased by 15 °C, compared to neat PLLA. The properties improvement of PLLA films containing nano clays demonstrated the possibility to extend the range of biodegradable film applications, especially in the field of packaging. 相似文献
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Taddao Pahasup-anan Kowit Suwannahong Wipada Dechapany Ratthapol Rangkupan 《环境科学学报(英文版)》2018,30(10):13-24
In present study, a simultaneous electrospinning and electrospraying(SEE) process was employed to produce microclusters of TiO_2 nanoparticles and interlock them in nanofibrous network. The photocatalytic composite membranes(PCMs) were fabricated by electrospraying TiO_2 nanoparticle suspension into microcluster form that dispersed and entrapped within nylon-6 electrospun fiber membrane. Three PCMs membrane with TiO_2 content of 52.0, 83.6,and 91.7 wt.% were successfully fabricated. The membrane consisted of TiO_2 microclusters,ranging in sizes from around 0.3 to 10 μm, distributed uniformly within the nylon-6 nanofibrous network. PCMs photocatalytic activity against Methylene Blue(MB) in aqueous solution showed more than 98% MB removal efficiency after 120 min of photocatalytic oxidation(PCO) for all PCMs. For PCM with the highest TiO_2 content tested for 5 PCO cycles, it was found that most of their TiO_2 content remained incorporated within the nanofibrous structure. The concept of nanoparticles clusters entrapment with SEE fabrication employed here provide a simple and effective method for reducing detachment of nanostructure phase from nanocomposite membrane. 相似文献
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《环境科学学报(英文版)》2023,35(2):310-318
BiFeO3 (BFO), as a kind of narrow band-gap semiconductor material, has gradually emerged advantages in the application of photocatalysis. In this paper, Ca doped BFO nanoparticles Bi0.9Ca0.1FeO3 (BCFO) were prepared by sol-gel method. And BCFO and CdS nanocomposites with two morphologies were obtained by controlling the time of loading CdS under a low temperature liquid phase process. It is found that the band gap becomes narrower after doping Ca into BFO, which is conducive to the absorption of visible light. Among all the samples, the composite of CdS nanowires and BCFO nanoparticles obtained by reaction time of 10 min has the best photocatalytic performance. The degradation rate of Methyl Orange solution was 94% after 90 min under visible light irradiation, which was much higher than that of pure BCFO and CdS. Furthermore, significant enhancement in the degradation rate (100% degradation in 60 min) can be achieved in poled samples after electric polarization process. The highest degradation rate is due to the promoted separation of photogenerated carriers induced by the internal polarization field and the formation of S-scheme heterostructure between BCFO and CdS. Such BCFO-CdS nanocomposites may bring new insights into designing highly efficient photocatalyst. 相似文献
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M. M. Reddy Rahul K. Gupta Rakesh K. Gupta S. N. Bhattacharya R. Parthasarathy 《Journal of Polymers and the Environment》2008,16(1):27-34
The best approach to induce oxo-biodegradation in polyethylene is the use of special additives known as pro-oxidants. Pro-oxidants
accelerate abiotic oxidation and subsequent polymer chain cleavage rendering the product apparently more susceptible to biodegradation.
In this work, the abiotic oxidation is studied to understand how the addition of nanoclay affects the oxidation rate and the
degradation mechanism of oxo-biodegradable polyethylene. In order to achieve this, the following materials were used in this
study: (1) polyethylene (PE), (2) oxo-biodegradable polyethylene (OPE), (3) polyethylene nanocomposite (PENac), and (4) oxo-biodegradable
polyethylene nanocomposite (OPENac). Wide-Angle X-ray scattering (WAXS) and Transmission Electron Microscopy (TEM) studies
reveal that grafting in the preparation of composites helps to achieve mixed intercalated/exfoliated morphology in PENac and
OPENac. Abiotic oxidation was carried out in an oven for a period of 14 days at 70 °C with air supply. The effect of abiotic
oxidation was evaluated by measuring the changes in tensile strength, elongation at break, carbonyl index and molecular weight.
Results show that OPE and OPENac are more susceptible to oxidation than PENac. The molecular weight distribution data obtained
from GPC reveal that the addition of nanoclay does not alter the oxidation mechanism in OPE significantly. 相似文献
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