CHARACTERIZATION OF THE MOLECULAR-WEIGHT DISTRIBUTION OF ISOTACTIC POLYPROPYLENE BY TURBIDITY AT THE LOWER CRITICAL SOLUTION TEMPERATURE (LCST)

被引：8

作者：

BOHOSSIAN, T

DELMAS, G

机构：

[1] Chemistry Department, Université du Québec À Montréal, Montréal, Quebec, H3C 3P8, C.P. 8888, succursale A

来源：

JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS | 1992年 / 30卷 / 09期

关键词：

POLYPROPYLENE; MWD FROM TURBIDITY AT LOWER CRITICAL SOLUTION TEMPERATURE OF; MOLECULAR WEIGHT DISTRIBUTION OF POLYPROPYLENE FROM TURBIDITY AT LCST; TURBIDITY AT LCST OF POLYPROPYLENE; MWD CHARACTERIZATION BY;

D O I：

10.1002/polb.1992.090300907

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 molecular weight distribution (MWD) of high-molecular-weight isotactic polypropylene is measured by a new method developed for polyethylene (PE) using the turbidity at the lower critical solution temperature (LCST). The attenuation of transmitted light h(i) is measured at T(i) as each fraction i is separated from the solution during a temperature increase DELTA-T(i). From the thermogram, the set of h(i) (T(i)), the MWD can be calculated through a relation M(i) = f (T(i)). The solvent chosen, a mixture of butane and 2-methylbutane, optimizes resolution and relatively rapid dissolution. Homogenization and absence of degradation are verified by different methods including calorimetry in solution.

引用

页码：993 / 1004

页数：12

共 17 条

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Baker C.H., 1965, POLYMER, V6, P181

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