Characterization of polyether-polyurethanes by SEC coupled with viscometry and LALLS
- National Inst. of Chemistry, Ljubljana (Slovenia). Polymer Dept.
- Inst. Charles Sadron, Strasbourg (France)
Two- and three-component polyether-polyurethanes were characterized by means of size exclusion chromatography (SEC)-multidetector methods. SEC was coupled with three or two detectors in series, a continuous viscometer (CVM), a low angle laser light scattering (LALLS) photometer and a differential refractometer (DR), or with CVM and DR. Molecular weight (MW) averages were determined independently by SEC-LALLS and by SEC using universal calibration (SEC-UC). MWs obtained by SEC-UC agreed with the corresponding SEC-LALLS MWs up to 60,000, but were higher for MWs over 60,000. This apparent increase in MW was attributed to the non-linearity of the calibration curve in the range of MW over 7.10. Due to high limiting viscosity number [[eta]] of polyurethanes as compared to polystyrenes with the same MW, there was a big influence of concentration effects upon SEC when using calibration curves. For an accurate SEC-UC determination of the MW distribution, the parameter [[eta]] [center dot] c should be considered.
- OSTI ID:
- 5651265
- Journal Information:
- Journal of Liquid Chromatography; (United States), Journal Name: Journal of Liquid Chromatography; (United States) Vol. 16:17; ISSN 0148-3919; ISSN JLCHD8
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400102* -- Chemical & Spectral Procedures
CHEMICAL COMPOSITION
CHROMATOGRAPHY
LIGHT SCATTERING
MATERIALS
MOLECULAR WEIGHT
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PETROCHEMICALS
PETROLEUM PRODUCTS
PLASTICS
POLYAMIDES
POLYMERS
POLYURETHANES
SCATTERING
SEPARATION PROCESSES
SYNTHETIC MATERIALS