Star-shaped poly(lactic acid) with carboxylic acid terminal groups via poly-condensation

A series of star-shaped poly(lactic acid)s with carboxylic acid terminal groups have been synthesized by direct poly-condensation of lactic acid in the presence of a poly-carboxylic acid core molecule with triphenylphosphonium trifluoromethanesulfonate (TPP-T) catalyst. These star-polymers had therm...

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Bibliographic Details
Published in:Polymer (Guilford) 2012-08, Vol.53 (18), p.3842-3848
Main Authors: Abiko, Atsushi, Yano, Shin-ya, Iguchi, Makoto
Format: Article
Language:English
Subjects:
ammonium salts
Applied sciences
Exact sciences and technology
lactic acid
Organic polymers
Physicochemistry of polymers
poly(lactic acid)
Poly-condensation
Polycondensation
polymers
Preparation, kinetics, thermodynamics, mechanism and catalysts
solubility
Star-shaped
thermal properties
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Summary:A series of star-shaped poly(lactic acid)s with carboxylic acid terminal groups have been synthesized by direct poly-condensation of lactic acid in the presence of a poly-carboxylic acid core molecule with triphenylphosphonium trifluoromethanesulfonate (TPP-T) catalyst. These star-polymers had thermal properties not very much different from those of star-shaped poly(lactic acid) with hydroxyl terminal groups and linear poly(lactic acid), irrespective of the structure of the core molecule and number of polymer arms. Solubility and degradability of these star-polymers were, however, greatly enhanced compared to those of star-polymers with hydroxyl terminal groups and increased depending on the number of polymer arms. From the star-shaped polymers, a variety of ammonium salts and the corresponding carboxyamides were successfully prepared. [Display omitted]
ISSN:0032-3861
1873-2291
DOI:10.1016/j.polymer.2012.07.009