Effect of Compatibilizing Agent on the Properties of Highly Crystalline Composites Based on Poly(lactic acid) and Wood Flour and/or Mica |
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| Authors: | Adriana Gregorova Vladimir Sedlarik Miroslav Pastorek Hari Jachandra Franz Stelzer |
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| Institution: | (1) Institute for Chemistry and Technology of Materials, Faculty of Technical Chemistry, Chemical and Process Engineering, Biotechnology, Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria;(2) Polymer Centre, Faculty of Technology, Tomas Bata University in Zlin, Namesti T. G. Masaryka 275, 76272 Zlin, Czech Republic;(3) Jozef Stefan Institute, Jamova cesta 39, 1000 Ljubljana, Slovenia;(4) Department of Polymer Engineering, Faculty of Technology, Tomas Bata University in Zlin, Namesti T. G. Masaryka 275, 76272 Zlin, Czech Republic |
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| Abstract: | This article contains a concept of the mechanical properties improvement of the highly crystalline poly(lactic acid) (PLA)
and filled composites. PLA as a semi-crystalline thermoplastic polymer was plasticized with poly(ethylene glycol) and filled
with 30 vol% of organic and/or inorganic filler. The degree of crytallinity was intentionally increased by annealing. The
filler/polymer matrix interphase was modified with the addition of 4, 4′-Methylenediphenyl diisocyanate (MDI). The effect
of compatibilizing as well as plasticizing agent on the thermal and mechanical properties, the water-absorption behaviour
and crystallization characteristics were studied. The results indicated that high content of filler and crystallites have
a strong influence on the composite′s mechanical properties despite of the plasticizer content, showing a high Young modulus.
The MDI seems to react in preference easy with plasticizing agent and then alternatively with filler due to the low functionality
of commercial PLA grade. |
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