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Recent Advances in Understanding Flow Effects on Polymer Crystallization

Kornfield, Julia A. and Kumaraswamy, Guruswamy and Issaian, Ani M. (2002) Recent Advances in Understanding Flow Effects on Polymer Crystallization. Industrial & Engineering Chemistry Research, 41 (25). pp. 6383-6392. ISSN 0888-5885. https://resolver.caltech.edu/CaltechAUTHORS:20170424-105033192

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Abstract

Molecular aspects of polymer melt rheology play an extremely strong role in governing the processing−structure−property relations of semicrystalline polymers, the dominant materials in the plastics industry. Recent advances in experimental apparatus and methods have revealed that the dramatic changes in crystallization kinetics and morphology induced during shear follow a kinetic pathway. The rate of formation of oriented precursors is not limited by the usual activation barrier to nucleation but instead occurs many orders of magnitude faster, at a rate that tracks the dynamics of the polymer chains in the melt. Model polymers and their binary blends have shown that the relevant melt dynamics that control formation of the oriented threadlike nuclei are those of the longest chains in the melt and that the effect of the long chains is cooperative, greatly enhanced by long chain−long chain overlap. Thus, insights gained into the role of chain dynamics in the molecular mechanism of shear-enhanced crystallization may soon combine with parallel advances over the past decade regarding the dynamics of polydisperse melts to provide the underpinnings for truly predictive models of flow-enhanced crystallization of polymers.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1021/ie020237zDOIArticle
http://pubs.acs.org/doi/abs/10.1021/ie020237zPublisherArticle
ORCID:
AuthorORCID
Kornfield, Julia A.0000-0001-6746-8634
Additional Information:© 2002 American Chemical Society. Received 1 April 2002. Date accepted 6 June 2002. Published online 19 October 2002. Published in print 1 December 2002. We are very grateful to Dr. A. Prasad (Equistar Chemical) and Dr. R. L. Sammler (The Dow Chemical Co.) for providing the materials used in our studies. Synchrotron experiments were carried out at the beamline X27C of the National Synchrotron Light Source, Brookhaven National Laboratory, which is supported by the U.S. Department of Energy, Divisions of Material Sciences and Chemical Sciences, under Contract DE-AC02-98CH10886. This work was made possible by a number of funding sources:  Financial support from Proctor and Gamble, the Cargill-NIST ATP, the Schlinger fund, and NSF (DMR9901403 and PHY99-07949) is gratefully acknowledged.
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)DE-AC02-98CH10886
Proctor and GambleUNSPECIFIED
Cargill, Inc.UNSPECIFIED
Caltech Schlinger FundUNSPECIFIED
NSFDMR99-01403
NSFPHY99-07949
National Institute of Standards and Technology (NIST)UNSPECIFIED
Issue or Number:25
Record Number:CaltechAUTHORS:20170424-105033192
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20170424-105033192
Official Citation:Recent Advances in Understanding Flow Effects on Polymer Crystallization Julia A. Kornfield, Guruswamy Kumaraswamy, and Ani M. Issaian Industrial & Engineering Chemistry Research 2002 41 (25), 6383-6392 DOI: 10.1021/ie020237z
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:76849
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:24 Apr 2017 18:31
Last Modified:03 Oct 2019 17:50

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