排序方式: 共有27条查询结果,搜索用时 23 毫秒
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Tamer?Karay?ld?r?mEmail author Jale?Yan?k Mithat?Yüksel Mehmet?Sa?lam Michael?Haussmann 《Journal of Polymers and the Environment》2005,13(4):365-374
Degradation of a model polymer mixture (PVC/PS/PE) and a waste polymer mixture in the presence of HCl fixators (Red Mud, precipitated CaCO3 and dolamite) was studied using thermal gravimetric analysis (TGA) and a cycled-spheres-reactor. The experiments in cycled-spheres reactor model were performed by stepwise pyrolysis. Liquid products and HCl from each step were collected separately. For the model polymer mixture, the precipitated CaCO3 showed the best effect on the fixation of evolved HCl and the reduction of chlorine content in the liquid products whereas RM yielded the best result for the waste polymer mixture. In addition, using HCl fixator also affected the degradation of both types of polymer mixture, leading to the formation of more gaseous and less residue. 相似文献
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聚苯乙烯基离子交换纤维去除铅离子的应用研究 总被引:5,自引:0,他引:5
聚苯乙烯其离子交换纤维是一种理想的离子交换材料。它的特殊的物理形态决定它对一些有害气体如铅烟、颗粒铅等具有很好的净化作用,铅烟净化效率可达80%;对水溶液中毒性铅离子去除率可达86%。该纤维可做为治理毒性铅离子的材料。 相似文献
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The cracking of styrene derivative polymers dissolved in decalin was conducted with metal-supported carbon catalysts under
an inert gas atmosphere to recover monosubstituted styrene or monosubstituted ethylbenzene in higher yields than is obtained
by pyrolysis, and to elucidate the detailed reaction mechanisms in the solvent. Poly-(4-methylstyrene), poly-(4-t-butylstyrene), poly-(α-methylstyrene), and polystyrene were used. In decalin without a catalyst, each polymer was decomposed
into the monomer, dimer, and trimer derived from the corresponding polymer except for poly-(α-methylstyrene), which was decomposed
into the monomer and styrene. By using metal-supported carbon, the olefinic compounds derived from the corresponding polymer
were thoroughly hydrogenated to the saturated form in a nitrogen atmosphere by a hydrogen transfer reaction from decalin,
which was simultaneously dehydrogenated to tetralin and naphthalene with the evolution of hydrogen gas. In comparison with
metal species, Pd- and Ru-supported carbon catalysts maintained the hydrogenation activity for a longer time and with a lower
evolution of hydrogen than Pt or Rh. The dehydrogenation of decalin was mainly observed not on the metal surfaces, but on
the carbon surfaces over Pd-supported carbon. Stabilization of the monomers will be able to suppress the coking which occurs
with repolymerization in long running process.
Received: July 19, 2000 / Accepted: March 16, 2001 相似文献
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Maria Teresa García Gema Duque Ignacio Gracia Antonio de Lucas Juan F. Rodríguez 《Journal of Material Cycles and Waste Management》2009,11(1):2-5
The amount of extruded polystyrene (XPS) waste has increased in recent years due to the increase of its use in the thermal
insulation of buildings, transport vehicles, and refrigerators, among others. Dissolution with suitable solvents to achieve
a volume reduction of more than 100 times without degradation of polymer chains is one of the cheapest and most efficient
methods of recycling XPS. Several environmentally friendly solvents have been tested as dissolution agents for XPS volume
reduction; the action of these solvents does not produce any degradation of polymer chains. The solubility of the polymer
in such solvents at different temperatures was investigated. The solvent can be easily recycled by distillation, obtaining
a high-quality recycled polymer.
Chemical Feedstock Recycling & Other Innovative Recycling Techniques 6 相似文献
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We have succeeded in converting waste polystyrene from electrical appliances into a polymer flocculant for treating some kinds
of wastewater after chemical modification. Waste polystyrene, such as polystyrene foam and additive-containing TV cabinets,
was converted into a water-soluble polymer, polystyrene sulfate (PSS), and PSS of various degrees of aqueous viscosity was
obtained by introducing sulfone bridges during sulfonation. We examined the relationship between the degree of flocculation
of wastewater and the aqueous viscosity of the PSS, and found that PSS with medium viscosity is most suitable for flocculating
inorganic wastewater from a factory, and PSS with high viscosity is most suitable for dewatering organic domestic wastewater.
We report how PSS containing sulfone bridges works as a polymer flocculant for treating wastewater.
Received: July 19, 2000 / Accepted: September 21, 2000 相似文献
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采用熔融共混法制备聚苯乙烯(PS)/二硫化铁(FeS2)纳米复合材料研究FeS2对PS热稳定性和燃烧性能的影响。扫描电镜(SEM)结果表明FeS2能够很好地分散在PS基体中。热重分析(TGA)的数据显示,FeS2可以显著地提高残余炭量。锥形量热仪(CONE)结果表明,FeS2可以改变PS的分解,从而在复合材料的表面上形成炭层,导致燃烧和烟气方面的参数有效降低,如热释放速率(HRR)、总热释放(THR)、烟释放率(SPR)、烟释放总量(TSR)、平均质量损失速率(AMLR)和平均烟消光面积(ASEA)等。此外,极限氧指数也得到了提高。拉曼(LRS)的结果证实了残余炭中有石墨碳的存在,热降解过程中石墨碳的形成有利于对热扩散的抑制,从而改善了PS的热稳定和燃烧性能。 相似文献
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