INTRAMOLECULAR CROSSLINKING
INTRAMOLECULAR CROSSLINKING
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DOI：
10.1002/apmc.1977.050620110
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发表时间：
1977-01-01
期刊：
影响因子：
--
通讯作者：
AHARONI, SM
中科院分区：
文献类型：
--
作者：
AHARONI, SM
当一种高相对分子质量的聚合物在高于临界缠结浓度的溶液中轻微交联，只影响每个大分子的几个键时，它的溶液粘度会受到很大的影响。随机卷曲模型预测，作为交联剂密度的函数，粘度单调增加，导致快速凝胶化。大分子结构域模型预测，在相同的条件下，粘度将通过一个最小值，然后发展到凝胶。随着聚合物分子量的减小，模型之间的差异变得难以区分。研究表明，至少有四种聚合物--聚丙烯酰胺、聚乙烯醇、聚乙烯亚胺和高相对分子质量的环氧树脂(苯氧基)符合大分子结构域模型的预测。
When a high molecular weight polymer, in a solution of concentration above the critical concentration for entanglement, is lightly crosslinked to effect only a few bonds per macromolecule, its solution viscosity is significantly affected. The random coil model predicts a monotonous increase in viscosity as a function of crosslink density, leading to a fast gelation. The macromolecular domain model predicts that, under the same conditions, the viscosity will pass through a minimum before progressing to gelation. As the molecular weight of the polymer decreases, the differences between the models become indistinguishable. In this inquiry it is shown that at least the four polymers polyacrylamide, polyvinylalcohol, polyethyleneimine and high molecular weight epoxy (phenoxy), adhere to the prediction of the macromolecular domain model.