Hydrolysis of lactic acid based poly(ester-urethane)s

Kari Hiltunen*, Jukka Tuominen, Jukka V. Seppälä

*Corresponding author for this work

    Research output: Contribution to journalArticleScientificpeer-review

    30 Citations (Scopus)

    Abstract

    The hydrolysis behaviour of lactic acid based poly(ester-urethane)s has been studied in a buffer solution of pH 7-00 at 37 and 55°C. Samples were prepared using a straight two step lactic acid polymerization process. The lactic acid was first polymerized by condensation with a low molecular weight by hydroxyl terminated telechelic prepolymer and the molecular weight then was increased with a chain extender such as a diisocyanate. In the hydrolysis study, the effect on the hydrolysis rate of different stereostructures (different amount of D-units in the polymer chain) and the length of the ester units were studied. The rate of hydrolysis was examined by various techniques including weighing (water absorption and weight loss), GPC (molecular weight and polydispersity), and DSC (thermal properties). GPC measurements showed that at 37°C the weight average molecular weight of the poly(ester-urethane)s started to decrease slowly during the first week of hydrolysis, but that at 55°C the weight average molecular weight decreased dramatically during the first week of hydrolysis. Significant mass loss occurred later at both temperatures.

    Original languageEnglish
    Pages (from-to)186-192
    Number of pages7
    JournalPolymer International
    Volume47
    Issue number2
    DOIs
    Publication statusPublished - 1998
    MoE publication typeA1 Journal article-refereed

    Keywords

    • Hydrolysis
    • Lactic acid
    • Poly(ester-urethane)s

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