DEPENDENCE OF THE AVERAGE TRANSVERSAL ON THE LONGITUDINAL DIMENSIONS OF STATISTICAL COILS FORMED BY CHAIN MOLECULES
DEPENDENCE OF THE AVERAGE TRANSVERSAL ON THE LONGITUDINAL DIMENSIONS OF STATISTICAL COILS FORMED BY CHAIN MOLECULES
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DOI：
10.1002/pol.1946.120010505
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发表时间：
1946-01-01
影响因子：
3.4
通讯作者：
KUHN, W
中科院分区：
文献类型：
--
作者：
KUHN, W
由长链分子在溶液或本体橡胶中形成的统计卷曲的横向尺寸与卷曲的纵向尺寸h1无关，只要h1与拉伸分子的长度相比是小的。另一方面，其纵向矢量h1沿拉伸方向取向的线圈的横向尺寸在本体橡胶变形期间经历强制收缩。因此，横向维度的强制收缩对熵变有额外的贡献。在早期的工作中已经估计了它的量，它影响了公式中出现的数字因子，该公式将橡胶的应变-拉伸关系与净碎片的分子量联系起来。
The transversal dimension of the statistical coil formed by a long‐chain molecule in solution or in bulk rubber is independent of the longitudinal dimension, h1, of the coil as long as h1is small compared with the length of the stretched molecule. On the other hand, the lateral dimension of a coil whose longitudinal vector, h1, is oriented in the direction of stretch undergoes a forced contraction during the deformation of bulk rubber. The forced contraction of the transversal dimension is therefore supplying an extra contribution to the entropy change. Its amount has been estimated in earlier work and it influences the numerical factor occurring in the formula connecting the strain‐stretch relation for rubber with the molecular weight of the net fragments.