High temperature continuous viscometry coupled with analytic temperature rising elution fractionation for evaluating crystalline and semi-crystalline polymers
US4798081A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 22, 1987 |
| Grant date | Jan 17, 1989 |
| Priority date | — |
| Expiry date | Dec 22, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2030/885
- WIPO fieldMeasurement
- WIPO sectorInstruments
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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