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Third normal stress difference and component relaxation spectra for bidisperse melts under oscillatory shear

Kornfield, Julia A. and Fuller, Gerald G. and Pearson, Dale S. (1991) Third normal stress difference and component relaxation spectra for bidisperse melts under oscillatory shear. Macromolecules, 24 (19). pp. 5429-5441. ISSN 0024-9297. https://resolver.caltech.edu/CaltechAUTHORS:20180720-132716832

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Abstract

A recently developed rheooptical technique that simultaneously measures infrared dichroism and birefringence is used to study bidisperse, linear polymer melts in an oscillatory shear. The method was used to individually measure the contribution of the high and low molecular weight components to the third normal stress difference. This was accomplished by measuring the infrared dichroism due to deuterium-labeled polymers. Binary blends are prepared from nearly monodisperse pairs of hydrogenated and deuteriated polyisoprenes of molecular weights 53 000 and 370 000 with volume fractions of long polymer, Φ_L, of 0.10, 0.20, 0.30, 0.50, and 0.75. The long-chain relaxation in the blends shows the appearance of a peak for compositions with Φ_L ≤ 0.50 at approximately the same frequency as a similar peak in the pure short polymer. The response of the short-chain relaxation in the blends shows the appearance of a low-frequency shoulder that becomes surprisingly large as the volume fraction of long chains increases. The results are used to test a modified reptation model that includes constraint release and a short-range orientational coupling between chain segments.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://dx.doi.org/10.1021/ma00019a034DOIArticle
ORCID:
AuthorORCID
Kornfield, Julia A.0000-0001-6746-8634
Additional Information:© 1991 American Chemical Society. Received January 24, 1991; Revised Manuscript Received May 8, 1991. We are grateful for support for this research from the National Science Foundation through the Presidential Young Investigator (G. Fuller) and Graduate Fellowship (J. Kornfield) programs and from the Exxon Foundation and the Center for Materials Research at Stanford University. We thank Lewis Fetters for synthesizing the polymers employed in this study. We would like to thank Ron Larson for reading the manuscript and for his helpful comments and suggestions.
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Exxon Education Foundation UNSPECIFIED
Stanford UniversityUNSPECIFIED
Issue or Number:19
Record Number:CaltechAUTHORS:20180720-132716832
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20180720-132716832
Official Citation:Third normal stress difference and component relaxation spectra for bidisperse melts under oscillatory shear Julia A. Kornfield, Gerald G. Fuller, and Dale S. Pearson Macromolecules 1991 24 (19), 5429-5441 DOI: 10.1021/ma00019a034
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:88069
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:23 Jul 2018 21:51
Last Modified:03 Oct 2019 20:02

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