On Chain Statistics and Entanglement of Flexible Linear Polymer Melts
On Chain Statistics and Entanglement of Flexible Linear Polymer Melts
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柔性线性聚合物熔体的链统计和缠结
DOI：
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发表时间：
2007
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通讯作者：
Shi‐Qing Wang
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文献类型：
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作者：
Shi‐Qing Wang
理解链纠缠的起点是彻底检查链统计行为。着眼于最熟悉的线性柔性聚合物，我们根据文献数据表明：（a）在主链键数相同的情况下，大多数柔性线性聚合物具有可比较的线圈尺寸，并且尽管链厚度变化很大，但具有相似的柔性；（b）如果链厚度较大，则填充给定体积的链较少。已经提出了许多模型将起始缠结分子量 Me 或 Mc 与链构象特征联系起来。这些模型的具体预测经常与实验数据的各个子集一致，但它们常常被认为是彼此不相容的，因为它们是从不同的物理考虑中得出的。在目前的工作中，我们将理论预测与 Me 或 Mc 的广泛可用的实验数据进行比较。从精简版中得出以下结论...
A starting point to understand chain entanglement is to thoroughly examine chain statistical behavior. Focusing on the most familiar linear flexible polymers, we show based on the literature data that (a) at the same number n of backbone bonds most flexible linear polymers have comparable coil sizes and are similarly flexible in spite of widely varying chain thickness and (b) there are fewer chains to fill up a given volume if they are of larger chain thickness. Many models have been proposed to relate the onset entanglement molecular weight Me or Mc to chain conformational characteristics. The specific predictions of these models frequently find agreement with various subsets of experimental data, but they have often been regarded to be incompatible with each other because they are derived from different physical considerations. In the present work, we compare the theoretical predictions against the extensively available experimental data on either Me or Mc. The following conclusions emerge from the lite...