Concentrated Polymer Solutions are Different from Melts: Role of Entanglement Molecular Weight
Concentrated Polymer Solutions are Different from Melts: Role of Entanglement Molecular Weight
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DOI：
10.1021/ma4008434
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发表时间：
2013-06-25
期刊：
影响因子：
5.5
通讯作者：
Hassager, Ole
中科院分区：
文献类型：
--
作者：
Huang, Qian;Mednova, Olga;Hassager, Ole
我们比较了几种聚苯乙烯溶液和熔体的粘弹性与相同数量的纠缠。它表明，模量和时间可以移动，使得线性粘弹性性能是相同的，提供的缠结的数量是相同的。然而，在强拉伸流动的非线性特性是不同的，与聚合物溶液显示出显着更强的拉伸硬化比相应的熔体。虽然增加链的可扩展性的解决方案可以提供部分的解释，它表明，需要其他机制的解决方案和熔体之间的差异的充分解释。
We compare viscoelastic properties of several polystyrene solutions and melts with the same number of entanglements. It is demonstrated that the modulus and time can be shifted such that the linear viscoelastic properties are identical provided the number of entanglements are identical. However the nonlinear properties in strong extensional flow are different with polymer solutions showing markedly stronger extensional hardening than the corresponding melts. While increased chain extensibility for solutions may provide part of the explanation, it is demonstrated that other mechanisms are needed for a full explanation for the differences between solutions and melts.