SOLUTION PROPERTIES OF POLY(VINYLIDENE FLUORIDE) .2. RELATION BETWEEN MICROGEL FORMATION AND MICROSTRUCTURE

被引：23

作者：

LUTRINGER, G ^{[1
]}

MEURER, B ^{[1
]}

WEILL, G ^{[1
]}

机构：

[1] UNIV STRASBOURG 1,INST CHARLES SADRON,ECOLE APPLICAT HAUTS POLYMERES,F-67083 STRASBOURG,FRANCE

来源：

POLYMER | 1991年 / 32卷 / 05期

关键词：

POLY(VINYLIDENE FLUORIDE); MICROGEL; SIZE EXCLUSION CHROMATOGRAPHY; F-19 NUCLEAR MAGNETIC RESONANCE; MICROSTRUCTURE;

D O I：

10.1016/0032-3861(91)90515-K

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

In contrast to type I poly(vinylidene fluoride) (PVDF), solutions of type II PVDF contain, even in good solvents, a fraction of microgel that cannot be fully eliminated for characterization by light scattering. Intrinsic viscosity and size exclusion chromatography reveal that the soluble fraction has a molecular mass in the same range as type I samples, which are fully soluble in the same solvents. The shear moduli in the molten state reveal that the microgel fraction does not contain a high enough molecular mass to explain microgel formation by phase separation. From an analysis of the F-19 nuclear magnetic resonance spectra of both suspension- and emulsion-polymerized PVDF samples, with first-order Markov statistics, microgel formation is attributed to differences in microstructure, involving sequences with two reversed additions in a row.

引用

页码：884 / 891

页数：8

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