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TECHNICAL PAPERS

The Role of Temperature in the Entanglement Kinetics of a Polymer Melt

[+] Author and Article Information
R. S. Jeyaseelan

Rheology Research Laboratory, Mechanical Engineering Department, Texas A&M University, College Station, TX 77843-3123

A. J. Giacomin

Department of Mechanical Engineering, University of Wisconsin, 1513 University Avenue, Madison, Wl 53706-1572

J. Appl. Mech 62(3), 794-801 (Sep 01, 1995) (8 pages) doi:10.1115/1.2897016 History: Received September 13, 1993; Revised April 19, 1994; Online October 30, 2007

Abstract

Large-amplitude oscillatory shear (LAOS) experiments were conducted at different temperatures on a molten low-density polyethylene standard, designated IUPAC LDPE X. Jeyaseelan et al. (1993) have successfully employed a simplification of transient network theory to describe the LAOS behavior of this polymer melt, at 150°C. The transient network is described by two kinetic rate constants, one for the formation of entanglements due to Brownian motion (k 1 ), and another for the destruction of entanglements (k 2 ) due to the imposed deformation. Upon comparison of the predictions of this transient network theory with the measured LAOS behavior of this polymer, we find that the kinetic rate constants k 1 and k 2 are invariant in the range of temperatures examined (150 to 190°C). The temperature dependence of departures from linear viscoelasticity is fully accounted for in the equilibrium entanglement kinetics.

Copyright © 1995 by The American Society of Mechanical Engineers
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