High temperature continuous viscometry coupled with analytic tem

Details High temperature continuous viscometry coupled with analytic tem High temperature continuous viscometry coupled with analytic tem

1987-12-22

1989-01-17

Levy, Stewart J.

Measuring and testing

Liquid analysis or analysis of the suspension of solids in a...

Lubricant testing

73 611C, G01N 1100

Patent

active

047980818

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.

REFERENCES:
patent: 3837217 (1974-09-01), Schulz
patent: 4258564 (1981-03-01), Hulme et al.
patent: 4286457 (1981-09-01), Johnson, Jr.
patent: 4578990 (1986-04-01), Abbott et al.
patent: 4627271 (1986-12-01), Abbott et al.

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