Readily controllable step-growth polymerization method for poly(lactic acid) copolymers having a high glass transition temperature.

Abstract:

:Poly(lactic acid) (PLA) copolymers having a significantly higher glass transition temperature (T(g)) than that of high molar mass PLA homopolymers (typically 60 +/- 5 degrees C) were prepared. Lactic acid was copolymerized with 1,4:3,6-dianhydro-D-glucitol (isosorbide, ISB) and succinic acid (SA-2), 1,2,3,4-butanetetracarboxylic acid (BTCA-4) or 1,2,3,4,5,6-cyclohexanehexacarboxylic acid (HCA-6). The highest T(g)s obtained for the copolymers containing BTCA-4 and HCA-6 were 80 and 86 degrees C, respectively. The polymers were prepared by step-growth polymerization in the melt phase, which is an easily operable and simple PLA production method in comparison to the ring-opening polymerization (ROP) route. It was shown that the T(g) and the cross-linking induced by the polyfunctional carboxylic acid comonomers could be readily controlled by choosing a suitable polymerization time and temperature. Similar improvement in the T(g) as achieved for the copolymers of BTCA-4 and HCA-6 was not observed for linear copolymers containing ISB and SA-2.

journal_name

Biomacromolecules

journal_title

Biomacromolecules

authors

Inkinen S,Stolt M,Södergård A

doi

10.1021/bm901338n

subject

Has Abstract

pub_date

2010-05-10 00:00:00

pages

1196-201

issue

5

eissn

1525-7797

issn

1526-4602

journal_volume

11

pub_type

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