Crystallization of amorphous poly(lactic acid) induced by organic solvents |
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| Authors: | Naofumi Naga Yuji Yoshida Masaya Inui Keiichi Noguchi Shigemitsu Murase |
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| Affiliation: | 1. Department of Applied Chemistry, Material Science Course, College of Engineering, Shibaura Institute of Technology, Koto‐ku, Tokyo 135‐8548, Japan;2. Department of Organic and Polymer Materials Chemistry, Faculty of Technology, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184‐8588, Japan;3. Instrumentation Analysis Center, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184‐8588, Japan |
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| Abstract: | ![]()
Crystallization of amorphous poly(lactic acid) (PLA) was investigated in various organic solvents, such as acetone, ethylacetate, diethylether, tetrahydrofurane, methanol, hexane, toluene, xylene, and o‐dichlorobenene. Most of the solvents, except hexane, induced crystallization of amorphous PLA. Acetone was the most effective solvent to accelerate the crystallization among the solvents used. The crystallization was induced by permeation of acetone into the amorphous phase of PLA, and the permeation obeyed Fick type diffusion. The crystallization rate increased with increasing of conducting temperature. Crystallized PLA formed α crystalline structure. The permeated acetone in the crystallized PLA gradually evaporated as time passes, and the elimination of acetone affected thermal and mechanical properties of the crystallized PLA. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011 |
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| Keywords: | poly(lactic acid) organic solvent acetone crystallization |
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