The mechanism of the radiation‐induced crosslinking of polyolefins
The mechanism of the radiation‐induced crosslinking of polyolefins
复制标题
聚烯烃辐射交联机理
DOI：
10.1002/macp.1967.021000120
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发表时间：
1967
影响因子：
2.5
通讯作者：
D. O. Geymer
中科院分区：
文献类型：
--
作者：
D. O. Geymer
聚丙烯作为聚烯烃的模型，在各种自由基清除剂和离子清除剂存在下用 60Co-γ-辐射进行辐照，以确定交联反应本质上是自由基反应还是离子反应。结果发现，碘和具有不稳定氢原子的化合物可以抑制辐射诱导的交联。抑制剂的性质和相对有效性表明，交联反应是相当缓慢的热自由基反应。辐照聚丙烯的交联速率取决于温度，在 -196°C 下。它是如此之慢以至于无法被察觉。
Polypropylene, as a model for polyolefins, was irradiated with 60Co-γ-radiation in the presence of various radical scavengers and ion scavengers to determine whether the crosslinking reaction is free radical or ionic in nature. it was found that iodine and compounds having labile hydrogen atoms can inhibit the radiation-induced crosslinking. The nature and relative effectiveness of the inhibitors show, that the crosslinking reaction is a rather slow and thermal free radical reaction. The rate of crosslinking of irradiated polypropylene depends upon the temperature, and at -196°C. it is so slow as to be undetectable.