...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of thermal analysis and calorimetry >Pyrolytic degradation of common polymers present in packaging materials
【24h】

Pyrolytic degradation of common polymers present in packaging materials

机译：Pyrolytic degradation of common polymers present in packaging materials

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相关主题

摘要

Pyrolysis of polymers with widespread use, such as PET, HDPE, PVC, LDPE, PP and PS, been utilized extensively as plastic packaging materials, is the subject of this study. Low biodegradability and short life of polymers used in packaging have resulted in enormous waste amounts; thus, polymer recycling is more than imperative for modern, developed municipalities. One of the main problems is the production of either feedstock or valuable secondary materials, without additional environmental burden. In this context, the thermochemical methods lead not only to recycling of plastics but also to the creation of specific petrochemical industrial products, and the profit will be considerable. Pyrolizer accompanied by a GC/MS is a useful instrumental array for the study of the thermal degradation of several types of polymers. It is resulted that the cracking temperature affects the type and number of the segments produced, since higher temperatures strongly parcel the polymer chain to monomers and release smaller molecules, while at lower temperatures it is more likely to detect oligomers. Chromatographic results were sometimes complicated due to the isomers produced during pyrolysis. It is mainly supposed that polyolefins decompose through a radical process, where depolymerization propagates until H-abstraction occurs. PVC behaves differently due to the presence of halogens, fond to chain reactions, while for PS the main fragments eluted are styrene monomer, dimmer and trimmer. From PET analysis, it is concluded that the products of decomposition include CO2, PhCOOH, PhCOOCH = H-2 and other aromatic vinyl-substitutes, while PET depolymerization is keen on CaO catalysis for lower decomposition temperatures.

著录项

获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号