Increased impact strength of biodegradable poly(lactic acid)/poly(butylene succinate) blend composites by using isocyanate as a reactive processing agent

  1. Masaki Harada1,
  2. Tsubasa Ohya2,
  3. Kouji Iida1,*,
  4. Hideki Hayashi1,
  5. Koji Hirano1,
  6. Hiroyuki Fukuda1

Article first published online: 18 JUL 2007

DOI: 10.1002/app.26717

Issue

Journal of Applied Polymer Science

Journal of Applied Polymer Science

Volume 106, Issue 3, pages 1813–1820, 5 November 2007

Additional Information

How to Cite

Harada, M., Ohya, T., Iida, K., Hayashi, H., Hirano, K. and Fukuda, H. (2007), Increased impact strength of biodegradable poly(lactic acid)/poly(butylene succinate) blend composites by using isocyanate as a reactive processing agent. Journal of Applied Polymer Science, 106: 1813–1820. doi: 10.1002/app.26717

Author Information

  1. 1

    Nagoya Municipal Industrial Research Institute, Atsuta-ku Rokuban, Nagoya 456-0058, Japan

  2. 2

    Aichi Institute of Technology, Yachigusa, Yakusa-cho Toyota 470-0356, Japan

*Nagoya Municipal Industrial Research Institute, Atsuta-ku Rokuban, Nagoya 456-0058, Japan

Publication History

  1. Issue published online: 11 AUG 2007
  2. Article first published online: 18 JUL 2007
  3. Manuscript Accepted: 3 APR 2007
  4. Manuscript Received: 21 NOV 2006

Funded by

  • Japan Keirin Association, Tokyo, Japan

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Keywords:

  • PLA;
  • biodegradable;
  • biopolymers;
  • reactive processing;
  • compatibility

Abstract

Poly(lactic acid) (PLA) blended with poly(butylene succinate) (PBS) was prepared in the presence of lysine triisocyanate (LTI) by using a twin-screw extruder and injection molding machine. The physical properties, rheological behavior, compatibility, and morphology were investigated by using a tensile test, a Charpy impact test, melt mass-flow rate (MFR) measurements, size exclusion chromatography (SEC), and laser scanning confocal microscopy (LSCM). The impact strength of PLA/PBS(90/10 wt %) blend composite was about 18 kJ/m2 in the absence of LTI, and it increased to 50–70 kJ/m2 in the presence of LTI at 0.5 wt %. The MFR value of PLA/PBS(90/10 wt %) decreased from 25 g/10 min at 200°C in the absence of LTI to approximately 3 g/10 min in the presence of LTI. These results imply that isocyanate groups of LTI reacted with both terminal hydroxyl or carboxyl groups of the polymers. Spherical particles at 1 μm were observed by using LSCM in the presence of LTI. These results indicate that the LTI is a useful reactive processing agent to increase the compatibility of PLA/PBS blend composites to increase the impact strength of PLA. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007

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