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High molecular weight poly(l-lactic acid)s by polyesterification using diisopropylcarbodiimide (DIPC) and 4-(dimethylamino) pyridinium-p-toluene sulfonate (DPTS)

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Abstract

High molecular weight poly(l-lactic acid) has been prepared from the corresponding functionally terminated oligomers employing a polyesterification method at room temperature using diisopropylcarbodiimide and 4-(dimethylamino) pyridinium-p-toluene sulfonate. Self-condensation of hydroxyl and carboxylic acid-terminated poly(l-lactic acid) oligomers (M n : ~1,000) resulted in polymers with high molecular weights (M n  > 45,000) under mild conditions. End-group analysis by MALDI-TOF provided evidence for N-acylurea formation in the product under the reaction conditions employed.

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Authors and Affiliations

  1. Polymer Science and Engineering Division, CSIR-National Chemical Laboratory, Pune, 411008, India

    S. Shyamroy, B. Garnaik & S. Sivaram

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  1. S. Shyamroy
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  2. B. Garnaik
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  3. S. Sivaram
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Correspondence to B. Garnaik.

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Shyamroy, S., Garnaik, B. & Sivaram, S. High molecular weight poly(l-lactic acid)s by polyesterification using diisopropylcarbodiimide (DIPC) and 4-(dimethylamino) pyridinium-p-toluene sulfonate (DPTS). Polym. Bull. 72, 405–415 (2015). https://doi.org/10.1007/s00289-014-1285-0

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  • DOI: https://doi.org/10.1007/s00289-014-1285-0

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