LINEAR VISCOELASTIC BEHAVIOR OF DENSELY GRAFTED POLY (CHLOROETHYL VINYL ETHER)-G-POLYSTYRENE COMBS IN THE MELT
LINEAR VISCOELASTIC BEHAVIOR OF DENSELY GRAFTED POLY (CHLOROETHYL VINYL ETHER)-G-POLYSTYRENE COMBS IN THE MELT
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DOI：
10.1122/1.1579688
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发表时间：
2003-06
影响因子：
3.3
通讯作者：
C. Bailly;V. Stéphenne;Z. Muchtar;M. Schappacher;A. Deffieux
中科院分区：
文献类型：
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作者：
C. Bailly;V. Stéphenne;Z. Muchtar;M. Schappacher;A. Deffieux
我们测量了两种密集接枝聚（氯乙基乙烯基醚）-g-聚苯乙烯梳形聚合物熔体的线性粘弹性行为。两个样品均具有约800个乙基乙烯基醚单体的主链，并且接枝主链单体的比例分别为98%和10%。粘弹性行为表现出显着的特征。具有最高接枝密度的梳形聚合物在频率上表现出超过五个数量级的幂律行为。幂律可以通过整个链条的“劳斯式”运动来理解，其表观摩擦系数来自短移植物的快速劳斯动力学。或者，相同的行为可以被描述为“波动”物理凝胶的特征。接枝密度较低的梳形聚合物具有更复杂的行为。
We have measured the linear viscoelastic behavior in the melt of two densely grafted poly(chloroethyl vinyl ether)-g-polystyrene comb polymers. Both samples have a backbone of approximately 800 ethyl vinyl ether monomers and the fractions of grafted backbone monomers are 98% and 10%, respectively. The viscoelastic behavior shows remarkable features. The comb polymer with the highest grafting density shows a power law behavior over five orders of magnitude in frequency. The power law can be understood through a “Rouse-like” motion of the entire chains with an apparent friction coefficient coming from the fast Rouse dynamics of the short grafts. Alternatively, the same behavior can be described as the signature of a “fluctuating” physical gel. The less densely grafted comb polymer has a more complex behavior.