ORDERING PHENOMENA OF POLYMERIC CLUSTERS NEAR THE SOL-GEL TRANSITION - LIGHT-SCATTERING EXPERIMENTS

被引：17

作者：

DAHMANI, M ^{[1
]}

SKOURI, M ^{[1
]}

GUENET, JM ^{[1
]}

MUNCH, JP ^{[1
]}

机构：

[1] UNIV CADI AYYAD, FAC SCI SEMLALIA, MARRAKECH, MOROCCO

来源：

EUROPHYSICS LETTERS | 1994年 / 26卷 / 01期

关键词：

D O I：

10.1209/0295-5075/26/1/004

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Light scattering has been performed on solutions of polymeric clusters of poly(vinyl chloride) near the sol-gel transition where a peak in the scattering function is observed. This effect is analysed here in terms of a liquidlike order of polydisperse clusters. Clusters distributions were quenched to T = 20-degrees-C for solutions prepared at high temperature at different concentrations PHI(Q) below the critical gelation concentration PHI(Q)*. For a system diluted after quenching, the weight average molecular weight M(w)(PHI(Q)) and the peak position q* are shown to scale as M(w) is-proportional-to R(z)1.6 +/- 0.1 and q* is-proportional-to PHI-1/3 M(w)1/3, respectively in which R(z)(PHI(Q)) is the z-average radius of gyration and PHI(PHI(Q)) is the polymer volume fraction.

引用

页码：19 / 24

页数：6

共 14 条

[1] PHYSICAL GELS FROM PVC - MOLECULAR-STRUCTURE OF PREGELS AND GELS BY LOW-ANGLE NEUTRON-SCATTERING [J].