Don't cry for me Charlie Brown, or with compliance comes comprehension
Don't cry for me Charlie Brown, or with compliance comes comprehension
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不要为我哭泣查理·布朗，否则顺从就会得到理解
DOI：
10.1122/1.551117
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发表时间：
2000
影响因子：
3.3
通讯作者：
I. Echeverrı́a
中科院分区：
文献类型：
--
作者：
D. Plazek;I. Echeverrı́a
不同的线性粘弹性函数在理论上是彼此等价的，尽管它们强调的信息不同。然而，由于粘弹性测量永远无法在整个时间或频率范围内进行，并且结果无法以无限精度得知，因此值得研究各种其他等效的粘弹性函数。我们提供的实验数据表明，在硒和分子量分布较窄的低分子量聚苯乙烯的非缠结样品中，模量似乎存在缠结网络平台。我们展示了如何通过检查顺应性和延迟光谱来轻松避免混淆。我们还提供了根据动态储能模量和延迟光谱确定的平台长度的分子量依赖性数据。我们发现延迟光谱表明聚合物链缠结网络的存在，而在低分子量...
The different linear viscoelastic functions are, in theory, equivalent to each other, although the information that they emphasize is different. However, since viscoelastic measurements are never available over the entire time or frequency scale, and the results are not known with infinite precision, it is worthwhile to look at various of the otherwise equivalent viscoelastic functions. We present experimental data which show what appears to be an entanglement network plateau in the modulus, in nonentangled samples of selenium and a low molecular weight polystyrene with a narrow distribution of molecular weights. We show how the confusion can be easily avoided by inspecting the compliances and the retardation spectrum. We also present data on the molecular weight dependence of the length of the plateau as determined from the dynamic storage modulus and from the retardation spectrum. We find that the retardation spectrum identifies the presence of an entanglement network of polymer chains, whereas at low m...