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Molecular weight dependence of component dynamics in bidisperse melt rheology

Ylitalo, Caroline M. and Kornfield, Julia A. and Fuller, Gerald G. and Pearson, Dale S. (1991) Molecular weight dependence of component dynamics in bidisperse melt rheology. Macromolecules, 24 (3). pp. 749-758. ISSN 0024-9297. https://resolver.caltech.edu/CaltechAUTHORS:20180720-134054459

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Abstract

Simultaneous measurement of infrared dichroism and birefringence is used to study component relaxation in bimodal molecular weight distribution melts. Nearly monodisperse poly(ethylenepropylene) samples of molecular weights 53K, 125K, and 370K, all above the critical molecular weight for entanglement, were used. Results for the step-strain relaxation of each component and of the total sample are presented and discussed for binary blends of 10, 20, 30, 50, and 75% by volume of the higher molecular weight species for three seta of blends: 53K/125K, 53K/370K, and 125K/370K. For each sample, the relaxation dynamics of the blend and of each component depend upon the two polymer relaxation times and the blend composition. Effects of intermolecular orientational coupling interactions were observed, and a coupling strength of 0.45 was measured. The results of these experiments are compared to a reptation-based constraint release model, and a qualitative agreement is found.


Item Type:Article
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https://dx.doi.org/10.1021/ma00003a019DOIArticle
ORCID:
AuthorORCID
Kornfield, Julia A.0000-0001-6746-8634
Additional Information:© 1991 American Chemical Society. Received April 19, 1990; Revised Manuscript Received July 30, 1990. We are grateful to the National Science Foundation for support through the Presidential Young Investigator program for G. Fuller. This work was also supported by the Exxon Foundation and the Center for Materials Research at Stanford University. We thank Lewis Fetters for synthesizing the polymers used in this study.
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NSFUNSPECIFIED
Exxon Educational FoundationUNSPECIFIED
Stanford UniversityUNSPECIFIED
Issue or Number:3
Record Number:CaltechAUTHORS:20180720-134054459
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20180720-134054459
Official Citation:Molecular weight dependence of component dynamics in bidisperse melt rheology Caroline M. Ylitalo, Julia A. Kornfield, Gerald G. Fuller, and Dale S. Pearson Macromolecules 1991 24 (3), 749-758 DOI: 10.1021/ma00003a019
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:88074
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:23 Jul 2018 21:49
Last Modified:03 Oct 2019 20:02

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