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高分子链的去拥挤转变及低温流动

DOI: 10.3724/SP.J.1105.2011.11123, PP. 1001-1006

Keywords: 高分子链低温流动,去拥挤转变,高分子加工,玻璃化转变

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Abstract:

简述了拥挤理论的基本原理,运用拥挤理论来说明高分子链间弱相互作用对高分子链所处的状态的影响,特别是对高分子玻璃化转变的影响.在实验中,采用固体核磁共振方法探测高分子的链间邻近度,并比较了不同链间邻近度的高分子样品在玻璃化转变温度以下的压力诱导流行行为,发现即使测试温度比高分子玻璃化转变温度低132℃,高分子链在压力下依然可以进行局部流动,即高分子链的低温流动行为.拥挤理论为高分子链的低温流动行为提供了依据,并为玻璃化转变的机理提供了新的解释.与此同时,高分子链的低温流动也为高分子加工提供了新的思路和方法.

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