ON THE NUMBER OF BLOBS PER ENTANGLEMENT IN SEMIDILUTE AND GOOD SOLVENT SOLUTION - MELT INFLUENCE
ON THE NUMBER OF BLOBS PER ENTANGLEMENT IN SEMIDILUTE AND GOOD SOLVENT SOLUTION - MELT INFLUENCE
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DOI：
10.1021/ma00108a020
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发表时间：
1995-02-13
期刊：
影响因子：
5.5
通讯作者：
ADAM, M
中科院分区：
文献类型：
--
作者：
RASPAUD, E;LAIREZ, D;ADAM, M
报告了良好溶剂半稀溶液中粘弹性的测量结果。对于三种线性聚合物：聚苯乙烯、聚异戊二烯和聚丁二烯。结果表明，使用与静态特性相同的折合浓度 C/C*，可以得到三种不同的折合粘度 eta/eta（溶剂）曲线。用于静态属性的缩放不再有效，并且每条链需要 n(e) 个斑点才能使聚合物缠结。该数字（此处由渗透模量与弹性模量之比 K/G = n(e) 确定）被发现对于三种聚合物而言是不同的，并且与在熔体中测量的每次缠结的单体数量相同。粘度的简化变量为 eta/eta(Rouse)，作为 C/C-e 的函数，其中 eta(Rouse) = eta(溶剂)(C/C*)(1.30) 是 Rouse 模型预测的粘度，C-e = n(e)(0.76)C* 是聚合物开始缠结时的浓度。
Measurements of viscoelastic properties in good solvent semidilute solution are reported. for three linear polymer species: polystyrene, polyisoprene, and polybutadiene. It is shown that using the same reduced concentration C/C* as for static properties, three different curves are obtained for the reduced viscosity eta/eta(solvent). The scaling used for static properties is no longer valid and a number n(e) of blobs per chains are needed for polymers to be entangled. This number, here determined by the ratio of the osmotic modulus to the elastic modulus K/G = n(e), is found to be different for the three kinds of polymer and identical to the number of monomers per entanglement measured in the melt. The reduced variables for the viscosity are eta/eta(Rouse) as a function of C/C-e where eta(Rouse) = eta(solvent)(C/C*)(1.30) is the viscosity predicted by the Rouse model and C-e = n(e)(0.76)C* is the concentration at which polymers begin to be entangled.