Thermal properties and degradation characteristics of polylactide,linear low density polyethylene,and their blends |
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Authors: | Gursewak Singh Haripada Bhunia Anita Rajor Veena Choudhary |
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Affiliation: | (1) Department of Chemical Engineering, Thapar University, Patiala, India;(2) Department of Biotechnology & Environmental Sciences, Thapar University, Patiala, India;(3) Centre for Polymer Science and Engineering, Indian Institute of Technology, New Delhi, India; |
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Abstract: | Melt blending of linear low density polyethylene (LLDPE) and polylactide (PLLA) was performed in an extrusion mixer with post
extrusion blown film attachment with and without compatibilizer-grafted low density polyethylene maleic anhydride. The blend
compositions were optimized for tensile properties as per ASTM D 882-91. Based on this, LLDPE 80 (80 wt% LLDPE & 20 wt% PLLA)
and M-g-L 80/4 (80 wt% LLDPE, 20 wt% PLLA and 4 parts compatibilizer per hundred parts of resin) were found to be an optimum
composition. FTIR reveals that the presence of compatibilizer shifts carbonyl peak hence some increase in interaction between
LLDPE and PLLA. Morphological characteristics of the fracture surface of with and without compatibilizer blends were examined
by scanning electron microscopy. It shows that use of compatibilizer enhances the dispersions of PLLA in LLDPE matrix. Thermogravimetric
(TG) analysis of blends shows the M-g-L 80/4 blend has higher thermal stability among studied blends. The degradation study
under different pH of soil compost gives that in alkaline condition and the presence of compatibilizer was favorable for degradation.
This blend may be used for packaging application. |
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