Syntheses of High Molecular Weight Poly(L-phenyllactic acid)s by a Direct Polycondensation in the Presence of Stable Lewis Acids

Poly(L-phenyllactic acid)s (PLPhLAs) with high molecular weight were prepared by a direct polycondensation of L-phenyllactic acid in the presence of stable Lewis acids such as HfCl4·2THF under various reaction conditions. As a result, PLPhLAs with a number-average molecular weight (Mn) more than 100...

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Bibliographic Details
Published in:Chemistry letters 2011-06, Vol.40 (6), p.584-585
Main Authors: Nguyen, Hieu Duc, Jin, Xin, Kaneko, Daisaku, Kaneko, Tatsuo
Format: Article
Language:English
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Summary:Poly(L-phenyllactic acid)s (PLPhLAs) with high molecular weight were prepared by a direct polycondensation of L-phenyllactic acid in the presence of stable Lewis acids such as HfCl4·2THF under various reaction conditions. As a result, PLPhLAs with a number-average molecular weight (Mn) more than 100000 g mol−1 were obtained and showed specific optical rotation [α ]D25 of −46° and the glass-transition temperature (Tg) of 55 °C whose absolute values were higher than the reported values and was comparable with Tg of poly(L-lactic acid).
ISSN:0366-7022
1348-0715
DOI:10.1246/cl.2011.584