High temperature GPC of polypropylene

The highest temperature at which molecular weight distributions can be characterized by current techniques is 145°C. Supermolecular aggregates may exist at this temperature in polypropylene solutions in trichlorobenzene and other solvents. Dissolution procedures at higher temperatures are ineffectiv...

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Bibliographic Details
Published in:Journal of applied polymer science 1985-06, Vol.30 (6), p.2413-2418
Main Authors: Grinshpun, V., Rudin, Alfred
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Properties and characterization
Solution and gel properties
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Summary:The highest temperature at which molecular weight distributions can be characterized by current techniques is 145°C. Supermolecular aggregates may exist at this temperature in polypropylene solutions in trichlorobenzene and other solvents. Dissolution procedures at higher temperatures are ineffective in this case because of the limited thermal stability of polypropylene. Aggregate‐free solutions can be prepared, however, by controlling storage times at 145°C in mixtures with added stabilizers. Low angle laser light scattering measurements can be used to determine when true solutions have been produced. This occurs when measured second virial coefficients agree with values predicted for the Mw measured in the light scattering experiment. GPC–LALLS measurements of Mw and Mz provide similar information about the effects of storage time on dissolution of aggregates and polymer degradation.
ISSN:0021-8995
1097-4628
DOI:10.1002/app.1985.070300612