Journal
POLYMER
Volume 47, Issue 1, Pages 429-434Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2005.11.039
Keywords
biodegradable polymer; branched poly(lactide); stereocomplex
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Branched poly(lactide)(PLA)s with various lengths of graft chain were synthesized by ring-opening polymerization of L- or D-lactide (L- or DLA) in bulk. using polyglycidol as a macromitiator. The properties of polymer films of branched PLLA or PDLA obtained and their stereocomplex were investigated through thermal analysis and tensile testing. The branched PLLA or PDLA film exhibited a lower glass transition temperature (T-m), melting temperature (T-m). crystallinity, Young's modulus and a higher strain at break than the corresponding linear PLLA or PDLA film. The branched PLLA/branched PDLA stereocomplex film showed a high maximum stress and a high Young's modulus keeping its high strain at break. Moreover, the usefulness of branched PLLA or PDLA as a plasticizer of linear PLLA was investigated with 1:9 blend or stereocomplex film prepared from the branched PLLA or branched PDLA and linear PLLA. The blend or linear PLLA/branched PDLA stereocomplex film showed a higher strain at break compared with linear PLLA film. The mechanical properties of the blend or linear PLLA/branched PLLA stereocomplex film could easily be controlled by changing the molecular weight of branched PLA. (c) 2005 Elsevier Ltd. All rights reserved.
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