Pom-pom-like constitutive equations for comb polymers
Pom-pom-like constitutive equations for comb polymers
复制标题
梳状聚合物的类 pom-pom 本构方程
DOI：
10.1122/1.4895606
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发表时间：
2014
影响因子：
3.3
通讯作者：
D. Read
中科院分区：
文献类型：
--
作者：
Helen Lentzakis;Chinmay Das;D. Vlassopoulos;D. Read
与pomm -pom模型类似，我们引入了一个简单的梳状聚合物模型，通过考虑一组描述单个分支间主链段拉伸的耦合方程，将多个侧臂连接到一个线性主链上。拉伸方程预测随着流速的增加，主干拉伸会突然发生。拖-应变耦合在某种程度上平滑了这种过渡。对于一系列表征良好的聚异戊二烯和聚苯乙烯梳子，我们发现与实验测定的单轴拉伸瞬态应力增长系数吻合良好。
In analogy with the pom-pom model, we introduce a simple model for comb polymers with multiple side-arms attached to a linear backbone by considering a set of coupled equations describing the stretch in the individual interbranch backbone segments. The stretch equations predict a sudden onset of backbone stretch as the flow rate is increased. Drag-strain coupling smooths this transition to some extent. For a series of well characterized polyisoprene and polystyrene combs, we find good agreement with the experimentally determined transient stress growth coefficients in uniaxial extension.