Crystallization of sheared polymer melts: poly(ethylene oxide) fractions

Crystallization under controlled shear conditions has been optically monitored for a series of sharp molecular weight fractions of poly(ethylene oxide). The minimum shear rate (MSR) necessary to produce oriented crystalline morphologies exhibited a strong molecular weight (M) dependence: MSR = K/M e...

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Bibliographic Details
Published in:Polymer bulletin (Berlin, Germany) Germany), 1989-12, Vol.22 (5-6), p.593-598
Main Authors: BUERGER, D. E, ENGBERG, K, JANSSON, J.-F, GEDDE, U. W
Format: Article
Language:English
Subjects:
Applied sciences
Crystallization
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Properties and characterization
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Summary:Crystallization under controlled shear conditions has been optically monitored for a series of sharp molecular weight fractions of poly(ethylene oxide). The minimum shear rate (MSR) necessary to produce oriented crystalline morphologies exhibited a strong molecular weight (M) dependence: MSR = K/M exp 1.47 . The time necessary for erasure of orientation effects after crystal melting was also determined and found to be proportional to M exp 1.42 . Graphs. 11 ref.--AA
ISSN:0170-0839
1436-2449
DOI:10.1007/BF00718939