A LOCAL APPROACH TO THE DYNAMICS OF STAR POLYMERS

被引：24
作者：
GUENZA, M [1 ]
MORMINO, M [1 ]
PERICO, A [1 ]
机构：
[1] CNR, CTR STUDI CHIMICOFIS MACROMOLEC SINTET & NAT, CORSO EUROPA 30, I-16132 GENOA, ITALY
来源：
MACROMOLECULES | 1991年 / 24卷 / 23期
关键词：
D O I：
10.1021/ma00023a018
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
The optimized Rouse-Zimm approach to the local dynamics of polymer solutions (ORZLD: Perico, A. Acc. Chem. Res. 1989, 22, 336) is extended to describe star polymers. A first-order model in the ORZLD hierarchy is defined for dilute THETA solutions, based on a freely rotating chain (FRC) description of semiflexible stars. The effects of the correlation at the star center and of the total or partial stretching of the arms due to segment concentration in the interior of the star are approximately taken into account. The partially stretched FRC star model is found in fairly good agreement with the available shrinking factor data on polystyrene stars as a function of the molecular weight. Strong effects are calculated for the slowing down of the correlation times for the bond relaxation in the interior of the star.
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收藏
页码：6168 / 6174
页数：7
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