Polymer Bulletin

, Volume 66, Issue 7, pp 939–953 | Cite as

Thermal properties and degradation characteristics of polylactide, linear low density polyethylene, and their blends

  • Gursewak Singh
  • Haripada Bhunia
  • Anita Rajor
  • Veena Choudhary
Original Paper


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.


Poly(l-lactic acid) Linear low density polyethylene Blending Thermal stability Soil compost 



The authors are thankful to the All India Council of Technical Education (AICTE), New Delhi, for part funding the project and Pluss Polymers, New Delhi for gifting the compatibilizer.


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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Gursewak Singh
    • 1
  • Haripada Bhunia
    • 1
  • Anita Rajor
    • 2
  • Veena Choudhary
    • 3
  1. 1.Department of Chemical EngineeringThapar UniversityPatialaIndia
  2. 2.Department of Biotechnology & Environmental SciencesThapar UniversityPatialaIndia
  3. 3.Centre for Polymer Science and EngineeringIndian Institute of TechnologyNew DelhiIndia

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