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首页> 外文期刊>Journal of Applied Polymer Science >Photodegradation of thermoplastic elastomeric rubber-polyethylene blends
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Photodegradation of thermoplastic elastomeric rubber-polyethylene blends

机译：热塑性弹性橡胶-聚乙烯共混物的光降解

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The photodegradation of a new family of thermoplastic elastomers, based on blends of natural rubber and polyethylene, was studied with laboratory ultraviolet exposures in the unstrained state and under tensile strain (25 and 50%). Strained exposure caused reduction of the strain to failure in subsequent tensile tests. The blends were more resistant to degradation than the natural rubber homopolymer. The introduction of crosslinks (at a low concentration so that the thermoplastic nature of the blends was retained) changed the resistance to photo-oxidation. Two different crosslinking systems were used. When dicumyl peroxide was used as the crosslinking agent, the resistance to degradation was reduced, whereas the compound containing a sulfur curing system showed improved resistance to photodegradation. Photo-oxidation rather than ozone degradation was found to be the major cause of breakdown, even with samples held in tension. (C) 2002 Wiley Periodicals, Inc. [References: 31]
机译：在天然橡胶和聚乙烯的共混物的基础上，研究了一系列新的热塑性弹性体的光降解性，并在实验室紫外线下以未应变状态和拉伸应变（25％和50％）进行了研究。在随后的拉伸试验中，暴露的应力使应变降低至破坏。该共混物比天然橡胶均聚物更耐降解。交联的引入（低浓度使共混物保持热塑性）改变了抗光氧化性。使用了两种不同的交联体系。当使用过氧化二枯基作为交联剂时，抗降解性降低，而含硫固化体系的化合物显示出抗光降解性提高。发现光氧化而不是臭氧降解是分解的主要原因，即使样品处于张力下也是如此。 （C）2002 Wiley Periodicals，Inc. [参考：31]

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