Prediction of melt state poly(α-olefin) rheological properties:: The unsuspected role of the average molecular weight per backbone bond
Prediction of melt state poly(α-olefin) rheological properties:: The unsuspected role of the average molecular weight per backbone bond
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DOI：
10.1021/ma025659z
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发表时间：
2002-12-31
期刊：
影响因子：
5.5
通讯作者：
Richter, D
中科院分区：
文献类型：
--
作者：
Fetters, LJ;Lohse, DJ;Richter, D
先前已经表明，柔性聚合物的缠结分子量（M-e）和平台模量（G（N）（0））可以通过使用填充长度（rho）与未扰动的链尺寸（0）/M、链密度（rho）相关联，所述填充长度（rho）被定义为链的体积除以其均方端到端距离。对于其中（0）/M保持未测量的聚烯烃和共聚烯烃，本文提出了一种方法，其中每个主链键的平均分子量（m（B））的知识允许估计G（N）（0）并因此估计M-e。这对于聚烯烃共聚物的情况是特别有价值的，其中熔体链尺寸（以及因此填充长度）是未知的。
It has previously been shown that the entanglement molecular weight (M-e) and the plateau modulus (G(N)(0)) of flexible polymers can be correlated to the unperturbed chain dimension, (0)/M, chain density (rho) via the use of the packing length (rho), which is defined as the volume of a chain divided by its mean square end to end distance. For polyolefins and co-polyolefins where (0)/M remains unmeasured a method is presented herein where knowledge of the average molecular weight per backbone bond (m(b)) allows G(N)(0) and thus M-e to be estimated. This is particularly valuable for the case of polyolefin copolymers where the melt chain dimensions (and thus the packing length) are unknown.