Table of Contents
Journal of Polymers
Volume 2013, Article ID 209529, 6 pages
http://dx.doi.org/10.1155/2013/209529
Research Article

Creep and Recovery Behavior of Compression Molded Low Density Polyethylene/Cellulose Composites

Department of Physics, Kenyatta University, P.O. Box 43844, Nairobi, Kenya

Received 15 August 2013; Revised 29 October 2013; Accepted 16 November 2013

Academic Editor: Cornelia Vasile

Copyright © 2013 Martin M. Riara et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Low density polyethylene (LDPE) is an important industrial material because it is durable, light-weight, easily processed and characteristically inert, but its everyday use is hazardous to the environment. The solution to this seems to consist of incorporation of biopolymers in the structure of LDPE to form composites. Compression molded composites at different cellulose loading were subjected to creep tests at 30, 40, 50, and 60°C. The samples were displaced for 12 minutes and allowed to recover for 12 minutes. Creep behavior of the polymer composites was governed by temperature, time, and cellulose loading. Creep performance decreased with increase in temperature and improved with cellulose loading while creep modulus decreased with increase in time and temperature. Time temperature superposition was used to predict the long time (up to 106 s) creep behavior of the samples. William-Landel-Ferry (WLF) model offered a better description of the shift factors based on the short term data that was used to predict the long time behavior of the polymer composites by shifting the curves along the logarithmic time axis. The deformation was dependent on free volume.