Flow-injection polymer analysis of ethylene propylene diene monomer elastomers. I

Autor: Larry Meiske, Drew S. Poché, Raymond J. Brown
Rok vydání: 2002
Předmět:
Zdroj: Journal of Applied Polymer Science. 85:2178-2189
ISSN: 0021-8995
DOI: 10.1002/app.10821
Popis: A rapid, flow-injection polymer analysis (FIPA) method for the solution characterization of EPDM elastomers, with a wide range of ethylene comonomer content, was developed. Solutions of the polymer were introduced into a flowing mobile phase which was monitored by an array of three detectors: a right-angle laser light-scattering unit, a differential refractive index detector, and a differential pressure viscometer. To adequately characterize a wide range of comonomer composition, it was found that a nominal temperature of 90°C and a solvent (e.g., 1,2,4-trichlorobenzene) capable of high-temperature sample dissolution was needed for the analysis. Polymer association or aggregation was observed in cyclohexane at lower analysis temperatures. With an analysis time of a few minutes, information on molecular weight, molecular size, and comonomer composition can be obtained directly. Information regarding polydispersity and properties such as melt viscosity may be obtained indirectly or through correlation to other, independent property measurements. The data were also compared to a high-temperature GPC analysis method already in use. The combination of rapid analysis time and measurement of fundamental molecular properties suggests the usefulness of the instrumentation and method to plant process control. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 85: 2178–2189, 2002
Databáze: OpenAIRE
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