Degradation Mechanism of Peroxide-crosslinked EPDMs by Residual Peroxide
Degradation Mechanism of Peroxide-crosslinked EPDMs by Residual Peroxide
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残留过氧化物对过氧化物交联 EPDM 的降解机制
DOI：
10.2324/gomu.83.65
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
Y. Ohtake
中科院分区：
文献类型：
--
作者：
K. Nakayama;Y. Ohtake
用FT-IR和13 C高分辨固体NMR研究了老化过氧化二异丙苯（DCP）交联EPDM的化学结构。研究了DCP交联EPDM中残余DCP的降解机理，发现DCP交联EPDM的热降解是由于亚乙基双烯C=C键的消失，羰基、羧基和羟基的生成以及聚合物链的断裂。可以认为，DCP交联EPDM中残留的DCP加速了过氧化物和过氧化氢的生成。过氧化物和氢过氧化物极不稳定，从而引起各种降解反应，例如自由基的产生、断链和EPDM聚合物的氧化反应。
The chemical structures of aged dicumyl peroxide(DCP)-crosslinked EPDMs were investigated with FT-IR and 13C high-resolution solid state NMR. The mechanism of degradation induced by residual DCP was studied in DCP-crosslinked EPDMs.The thermal degradation of DCP-crosslinked EPDMs occurred with the disappearance of C=C bond of ethylidene norbornene and generation of carbonyl, carboxy and hydroxy groups and the scission of polymer chains. It can be considered that the residual DCP in DCP-crosslinked EPDMs accelerated the production of peroxide and hydroperoxide. The peroxide and hydroperoxide are extremely unstable, thereby causing various degradation reactions such as production of radicals, chain scission, and oxidation reactions of EPDM polymer.