外文翻译--聚氯乙烯的回收（节选）

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1、中文 4500 字 ， 2700 单词， 15500 英文字符 出处： Braun D. Recycling of PVCJ. Progress in Polymer Science, 2002, 27(10):2171-2195. Recycling of PVC Abstract Recycling of used PVC needs a careful characterization of PVC waste. The analysis of the scrap, especially with respect to the thermal stability and the mole

2、cular weight, is useful before reprocessing. Additional stabilization of used PVC can be done by up to 10 wt% fillers, e.g. chalk, which does not change the mechanical properties. A literature survey on the proposed concepts and methods for material and chemical recycling of PVC is given. q 2002 Pub

3、lished by Elsevier Science Ltd. Keywords: Poly(vinyl chloride); Degradation; Stabilization; Material and chemical recycling 1. Introduction With a todays worldwide annual production capacity of approximately more than 30 million to poly(vinyl chloride) (PVC) is the second largest volume thermoplasti

4、c only to polyethylene as volume leader in the plastics industry 1. Its ability to be compounded with many additives to a wide range of flexible and rigid products constitutes the major factor responsible for the versatile application of PVC.Because of the low cost and the processability by a wide v

5、ariety of techniques (e.g. calendering,extrusion, injection moulding, and plastisol techniques) combined with good physical, chemical and weathering properties, PVC has become a universal polymer 2 with many applications, e.g. for pipes,profiles, floor coverings, cable insulation, roofing sheets, pa

6、ckaging foils, bottles, and medical products. At the end of the service-time of these articles, large amounts of scrap arise. Therefore, the question of the disposal of used PVC has gained increasing importance in the public discussion because of the environmental problems resulting from the rapid growth of the plastic waste during the last years.Landfilling of municipal solid waste is becoming a burden as, for example, in the United States about80% of waste is dumped into landfil