High temperature continuous viscometry coupled with analytic temperature rising elution fractionation for evaluating crystalline and semi-crystalline polymers
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United States of America Patent
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Jan 17, 1989
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app pub date -
Dec 22, 1987
filing date -
Nov 27, 1985
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Abstract
A method and apparatus for analyzing a solution of a crystalline or a semi-crystalline polymer sample to determine a crystallinity versus weight percent profile concurrently with viscosity average molecular weight. The polymer sample is first precipitated from solution over a cooling temperature gradient to produce a precipitated polymer sample, which is precipitated as a function of its crystallinity. The precipitated polymer sample is then eluted and redissolved over a heating temperature gradient to produce successive fractions of a fractionated polymer sample solution, which are measured to produce concentration and specific viscosity data from which the intrinsic viscosity and viscosity average molecular weight are calculated.
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