A thermodynamic prediction of tie chain length distribution in drawn semicrystalline polymers
A thermodynamic prediction of tie chain length distribution in drawn semicrystalline polymers
复制标题
拉伸半结晶聚合物中连接链长度分布的热力学预测
DOI：
10.1002/pen.760251307
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发表时间：
1985
期刊：
影响因子：
--
通讯作者：
D. Roylance
中科院分区：
文献类型：
--
作者：
R. Popli;D. Roylance
许多取向半晶聚合物断裂的机制被假设为一个热激活的、应力辅助的速率过程，在这个过程中，连接晶体单元的链发生了热机械解离。以往基于这一概念的一些数值模型假设在较高的试样应变作用下逐渐断裂的领带链轮廓长度为高斯分布，并采用电子自旋共振（ESR）谱法获得其分布的数值参数。本文基于自由能最小化理论计算了晶体间链长分布。我们的结果，虽然与早期的模型基本一致，但建议对一些关于分子断裂过程的ESR发现进行重新解释。
The mechanism underlying fracture of many oriented semicrystalline polymers is hypothesized to be a thermally activated, stress-aided rate process in which the tie chains connecting crystalline units suffer thermomechanical dissociation. Some previous numerical models based on this concept have assumed a Gaussian distribution of tie chain contour lengths which are ruptured progressively by successively higher specimen strains, and have used electron spin resonance (ESR) spectroscopy to obtain the numerical parameters of the distribution. The distribution of tie chain lengths in the intererystalline region is calculated theoretically in this paper, based on minimization of free energy. Our results, although in basic agreement with earlier models, suggest a reinterpretation of some of the ESR findings with regard to molecular fracture processes.