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PSisslowlyattackedbyozoneascomparedtounsaturatedpolymers.Therelativeyieldofproductsid... PS is slowly attacked by ozone as compared to unsaturated polymers. The relative yield of products identified from this attack is 35% peroxide, 18% ketone and 47% acid. These products are similar to those expected from free radical chain oxidation processes. Ozen et al. have studied the effect on structural and mechanical properties of packaging films by ozone exposure and have reported that ozone treatment has affected the PE and polyamide films differently. It is responsible for formation of oxygen-containing functional groups, degradation of polymeric chains in PE films and increase in the eCeNe stretching in polyamide. Clough and Gillen have observed that the ozone generated by the action of the ionizing radiation in the air present in the atmosphere surrounding the samples affect the surface of the polymer. This observation has been made during gamma-radiation degradation studies of poly(butadiene-co-styrene) [SBRrubber] and poly(butadiene-co-acrylonitrile) [Buna-n rubber] in the presence of air. The oxides of nitrogen, sulfur, and ozone promote UV-induced oxidative damage of common plastics, particularly in rubber products . Ozone mainly affects vulcanized rubbers with unsaturation in the main polymer
chain and causes cracking in stretched form in rubber. Exposure to ozone gas causes change in the mechanical properties of linear LDPE, oriented PP and biaxially oriented nylon [99]. Gatenholm et al. have studied the effect of ozone on the microporous structure of PP. Exposure of isotactic PP to ozone results in surface oxidation which further increases when a microporous membrane has large surface area.
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磷脂酰丝氨酸缓慢侵袭臭氧比不饱和聚合物。从这次侵袭确定产品的相对收益率为35%双氧水,18%酮,47%酸。这些产品类似自由基链的氧化过程的预期的。对包装膜的结构和力学性能的影响臭氧接触进行研究,报告还说到,臭氧处理影响了聚乙烯和聚酰胺薄膜的差异。它负责氧形成含官能团,在聚乙烯薄膜和拉伸eCeNe在聚酰胺高分子链的降解增加。克拉夫和吉伦观察到,由电离辐射的空气样本周围大气层中存在的行动所产生的臭氧影响聚合物表面。这种看法已在γ-聚(丁二烯辐射降解研究,合作苯乙烯)[SBRrubber]和聚(丁二烯丙烯腈)[丁腈橡胶橡胶]存在。氮,硫氧化物,紫外线和臭氧推动所致,特别是在橡胶制品的普通塑料氧化损伤。臭氧主要影响硫化与主体聚合物不饱和橡胶
链和橡胶拉伸形式的侵袭原因。暴露在臭氧气体导致的线性低密度聚乙烯聚丙烯的力学性能为导向,改变和双向拉伸尼龙[99]。 Gatenholm已研究了聚丙烯微孔结构的臭氧的效果。等规聚丙烯的暴露在表面氧化,进一步提高微孔膜,比臭氧表面积大。
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