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Improvement of Crystallization and Mechanical Properties of PLA by Means of Clay Nanocomposite

Published online by Cambridge University Press:  01 February 2011

Hirotaka Okamoto ,
Mitsuru Nakano ,
Makoto Ouchi ,
Arimitsu Usuki  and
Yuji Kageyama
Hirotaka Okamoto
Affiliation:
Toyota Central R&D Labs., Inc., Nagakute, Aichi, 480–1192, Japan
Mitsuru Nakano
Affiliation:
Toyota Central R&D Labs., Inc., Nagakute, Aichi, 480–1192, Japan
Makoto Ouchi
Affiliation:
Toyota Central R&D Labs., Inc., Nagakute, Aichi, 480–1192, Japan
Arimitsu Usuki
Affiliation:
Toyota Central R&D Labs., Inc., Nagakute, Aichi, 480–1192, Japan
Yuji Kageyama
Affiliation:
Toyota Motor Corporation, 1200, Mishuku, Susono, Shizuoka, 410–1193, Japan
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Abstract

Some composite materials of poly (lactic acid) (PLA) with organophilic clays and an organic crystal accelerator (OCA) were prepared by melt compounding method to improve the rate of crystallization and mechanical properties, especially heat distortion temperature (HDT). The PLA/clay nanocomposite with 2.9wt% of finely dispersed organophilic clay and 1wt% of the OCA showed an exothermic peak corresponding to its crystallization at 1.9 minutes in the isothermal measurement of DSC at 100°C from its molten state, although PLA itself did not show a clear peak in the same procedure. Crystallized specimens of the nanocomposite were well obtained by injection molding when the hold time was set at more than 90 seconds. The HDT of the specimens that were held for more than 120 seconds in the mold exceeded 120°C. It is about 65°C higher than amorphous PLA. The crystallized specimen with 1wt% of the clay showed higher tensile modulus and Izod impact strength than the amorphous one.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 791: Symposium Q – Mechanical Properties of Nanostructured Materials and Nanocomposites , 2003 , Q11.10
Copyright
Copyright © Materials Research Society 2004

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References

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