DYNAMICS OF RELAXATION AT STRONGLY INTERACTING POLYMER-SOLID INTERFACES - EFFECTS OF CHAIN ARCHITECTURE

被引:22
作者
ADRIANI, PM
CHAKRABORTY, AK
机构
[1] LAWRENCE BERKELEY LAB,CTR ADV MAT,BERKELEY,CA 94720
[2] UNIV CALIF BERKELEY,DEPT CHEM ENGN,BERKELEY,CA 94720
关键词
D O I
10.1063/1.465033
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The relaxation dynamics of a polymer chain strongly adsorbed to a solid surface are simulated via a kinetic Ising model that includes chain connectivity constraints (steric hindrance, rotational strain, and configurational entropy). The two polymer architectures examined consist of one or two chemisorbing functional groups per segment. In both architectures, the chemisorbed polymer chain is trapped in nonequilibrium conformational states at low temperatures, but relaxes to equilibrium at higher temperatures with stretched exponential (KWW) relaxation kinetics. The average relaxation time for the two pendant group architecture has a strongly non-Arrhenius temperature dependence that obeys the Vogel-Fulcher law. In contrast, average relaxation times for the one pendant group architecture cannot be described b the Vogel-Fulcher law.
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页码:4263 / 4274
页数:12
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