The Critical Gel
The Critical Gel
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关键凝胶
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
H. Winter
中科院分区：
文献类型：
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作者：
H. Winter
大自然允许聚合物以惊人的简单和优雅通过凝胶点。然而，凝胶点的流变性是什么？处于凝胶点的聚合物，即“临界凝胶”，是否处于一种独特的物质状态，具有自己的特性？直到最近，这些问题似乎还没有得到解决。这些问题本可以避免，因为众所周知，已建立的流变学概念在凝胶点完全失效：粘度的概念不适用，因为粘度发散到无穷大，而平衡模数的概念是无用的，因为在凝胶点的模数仍然为零。凝胶点本身一直是个谜。
Nature allows polymers to pass through the gel point with striking simplicity and elegance. However, what are the rheological properties at the gel point? Is the polymer at the gel point, the ‘critical gel’, at a distinct material state that has its own properties? It seems that these questions, until recently, have not been pursued. The questions might have been avoided since it was well known that the established rheological concepts fail altogether at the gel point: the concept of a viscosity is inapplicable since the viscosity diverges to infinity and the concept of an equilibrium modulus is useless since the modulus is still zero at the gel point. The gel point itself had remained mysterious.