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Dynamics of each component in miscible blends of polyisoprene and polyvinylethylene

Arendt, B. H. and Kannan, R. M. and Zewail, M. and Kornfield, J. A. and Smith, S. D. (1994) Dynamics of each component in miscible blends of polyisoprene and polyvinylethylene. Rheologica Acta, 33 (4). pp. 322-336. ISSN 0035-4511.

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The dynamics of the individual components in 1,4-polyisoprene/polyvinylethylene (PIP/PVE) miscible blends are studied using dynamic stress-optical measurements. While the homopolymers are thermorheologically simple and obey the stress-optic rule, the blends show failure of time-temperature superposition and complex stress-optic behavior. The way in which the stress-optic rule fails reveals the relaxation dynamics of each species. The dynamic modulus and complex birefringence coefficient are analyzed to infer the relaxation of each component. The entanglement molecular weight, M_e, and monomeric friction coefficient, ζ_0, of each species as a function of blend composition and temperature are determined from the contribution of each species to the dynamic modulus. The effect of blending on M_e of each component is small; however, its effect on ζ_0 of each species is dramatic. Blending strongly speeds the rate of relaxation of the high T_g component (PVE), while more modestly slowing the relaxation of the low T_g component (PIP). The dynamics of each species have different temperature dependencies in the blend, which leads to the failure of the superposition principle. Furthermore, both the difference between the friction coefficients of the two species and the difference in their temperature dependencies is greater in blends rich in the high T_g material (PVE).

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Kornfield, J. A.0000-0001-6746-8634
Additional Information:© 1994 Dr. Dietrich Steinkopff Verlag GmbH & Co.
Subject Keywords:Polymer melt - dynamic moduli - flow birefringence - stress-optic rule - rheo-optical investigation - polymer blend
Issue or Number:4
Record Number:CaltechAUTHORS:20160901-075646346
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Official Citation:Arendt, B.H., Kannan, R.M., Zewail, M. et al. Rheola Acta (1994) 33: 322. doi:10.1007/BF00366959
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:70102
Deposited By: Ruth Sustaita
Deposited On:01 Sep 2016 17:08
Last Modified:03 Oct 2019 10:28

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