ANOMALOUS SEGMENT DIFFUSION IN POLYMER MELTS

被引：31

作者：

APPEL, M

FLEISCHER, G

KARGER, J

FUJARA, F

CHANG, I

机构：

[1] UNIV LEIPZIG,FAK PHYS & GEOWISSENSCH,LINNESTR 5,D-04103 LEIPZIG,GERMANY

[2] UNIV DORTMUND,FACHBEREICH PHYS,D-44221 DORTMUND,GERMANY

[3] UNIV MAINZ,INST PHYS CHEM,D-55099 MAINZ,GERMANY

来源：

MACROMOLECULES | 1994年 / 27卷 / 15期

关键词：

D O I：

10.1021/ma00093a031

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

For three high molecular weight samples of poly(dimethylsiloxane), polybutadiene, and polyisoprene the self-diffusion for times smaller than the reptation time T(rep) was investigated using field gradient NMR in the stray field of a cryomagnet. A time-dependent apparent self-diffusion coefficient D(app) is observed with time exponents b of the power law D(app) approximately t(b) between -0.57 and -0.73. These values are at variance with the strict reptation picture and support more recent theoretical concepts and computer simulations.

引用

页码：4274 / 4277

页数：4

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