SEDIMENTATION EQUILIBRIUM IN A DENSITY GRADIENT AND CHARACTERIZATION OF THE MOLECULAR-WEIGHT DISTRIBUTION OF POLY(METHYL METHACRYLATE)

被引：0

作者：

HARZSCHEL, R ^{[1
]}

MEYERHOFF, G ^{[1
]}

机构：

[1] UNIV MAINZ,INST PHYS CHEM,JAKOB WELDER WEG 11-15,W-6500 MAINZ,GERMANY

来源：

MAKROMOLEKULARE CHEMIE-MACROMOLECULAR CHEMISTRY AND PHYSICS | 1990年 / 191卷 / 12期

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 average molecular weights and the characterization of molecular weight distributions by the ratio of the weight- to number-average molecular weights MBAR(W)/MBAR(n) from sedimentation equilibrium in the ultracentrifuge are described. The essential measurement of the density profile of the mixed solvent is conducted according to Munk (Macromolecules 15, 500 (1982)). Special evaluation of the polymer band in the equilibrium allowed to deduce from the observed concentration profile MBAR(W) and MBAR(n) of a series of poly(methyl methacrylate) samples and thus to characterize the molecular weight distribution of the samples.

引用

页码：3139 / 3155

页数：17

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