Temperature dependence of segmental motion in polyisobutylene and poly(vinylethylene)
Temperature dependence of segmental motion in polyisobutylene and poly(vinylethylene)
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DOI：
10.1021/ma00045a014
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发表时间：
1992-09
期刊：
影响因子：
5.5
通讯作者：
K. Mcgrath;K. Ngai;C. Roland
中科院分区：
文献类型：
--
作者：
K. Mcgrath;K. Ngai;C. Roland
对聚（乙烯基乙烯）和聚异丁烯进行的固态 13 C NMR 测量表明，它们各自的链段弛豫背后的分子运动具有截然不同的温度依赖性。这些差异与两种聚合物在玻璃化转变温度附近表现出的对比机械行为相似。这表明更大的温度敏感性反映了更多的分子间合作弛豫
Solid-state 13 C NMR measurements carried out on poly(vinylethylene) and polyisobutylene demonstrate that the molecular motions underlying their respective segmental relaxations have vastly different temperature dependencies. These differences parallel the contrasting mechanical behavior exhibited by the two polymers in the vicinity of their glass transition temperature. It is suggested that greater temperature sensitivity reflects a more intermolecularly cooperative relaxation