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Home  >  Journal list  >  Polymer Journal  >  Vol.32  No.4 (2000)  >  pp.307-315

Polymer Journal
<<Previous article Vol.32  No.4 (2000)   pp.307 - 315 Next article>>

Synthesis and Characterization of Copoly(succinic anhydride-ethylene oxide)-Poly(L-lactide) Block Copolymer

Yasukatsu MAEDA1), Atsuyoshi NAKAYAMA2), Ioannis ARVANITOYANNIS3), Norioki KAWASAKI2), Kazuko HAYASHI2), Noboru YAMAMOTO2) and Seiichi AIBA2)
1) Industrial Technology Center of Wakayama Prefecture, WINTEC, Department of Material Technology, 60 Ogura, Wakayama, 649-6261, Japan
2) Osaka National Research Institute, AIST, Department of Organic Materials, 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan
3) Aristotelian University of Thessaloniki, Faculty of Agriculture, Department of Food & Science Technology, Box 265 540 06 Thessaloniki, Greece


ABSTRACT:  The polymerization of L-lactide (LA) was carried out in the presence of tin(II) 2-ethylhexanoate, Sn-(Oct)2 and copoly[succinic anhydride (SA)-ethylene oxide (EO)] which has a hydroxyl end group. The synthesized copolymers were characterized by GPC, 1H NMR, 13C NMR, and DSC. The products were block copolymers consisting of copoly(SA-EO) and poly(L-lactide) (PLA) segments. Optical micrographs of the copolymer films confirmed the presence of spherulitic morphology. Spherulite size was enhanced with increase in the LA content in the copolymers. The block copolymers were hydrolyzed with or without lipase and biodegraded by enzymes from microorganisms in activated sludge. Hydrolyzability decreased with increase in LA content in the block copolymers. The solubility of the block copolymers containing LA segment in tetrahydrofuran (THF) was higher than that of copoly(SA-EO).


Keyword:
Poly(L-lactide)/ Synthesis/ Block Polymer/ Biodegradable

Published online: June 29, 2001
© Copyright, 2000 by The Society of Polymer Science, Japan

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