Correlation between molecular structure and copolymer composition and the Mark-Houwink constants of methyl methacrylate N-phenylmaleimide copolymers

被引：0

作者：

Menges, M ^{[1
]}

Schmidt-Naake, G ^{[1
]}

机构：

[1] Tech Univ Clausthal, Inst Tech Chem, D-38678 Clausthal Zellerfeld, Germany

来源：

ANGEWANDTE MAKROMOLEKULARE CHEMIE | 1998年 / 258卷

关键词：

D O I：

暂无

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 determination of Mark-Houwink constants using gel permeation chromatography data, based on a universal calibration and Ubbelohde capillary viscosimetry, for methyl methacrylate (MMA)/N-phenylmaleimide (NPI) copolymers of different molar mass or molar mass distribution has been examined. Mark-Houwink constants of bimodal molar mass distributions could not be obtained. They give, under the prerequisite of similar chemical composition, considerable deviations from the usual relation between intrinsic viscosity and molar mass. The Mark-Houwink constants determined for MMA/NPI copolymers with monomodal molar mass distributions containing 20-30 mol-% NPI at 35 degrees C in tetrahydrofuran were K = 1.34.10(-4) and alpha = 0.73. Comparison with poly(methyl methacrylate) (PMMA) under the same measurement conditions shows constants of the Mark-Houwink relation with K = 1.43.10(-4) and alpha = 0.71, similar to those for monomodal MMA/NPI copolymers with 20-30 mol-% NPI. Higher contents of NPI in monomodal MMA/NPI copolymers or poly(N-phenylmaleimide) (PNPI) give no clear Linear proportionality of the intrinsic viscosity to molar mass.

引用

页码：51 / 55

页数：5

共 14 条

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