Synthesis and characterization of a biodegradable thermoplastic poly(ester-urethane) elastomer

Janne Kylmä, Jukka V. Seppälä*

*Corresponding author for this work

    Research output: Contribution to journalArticleScientificpeer-review

    143 Citations (Scopus)

    Abstract

    Thermoplastic poly(ester-urethanes) were polymerized in a two-step process: a condensation copolymerization of lactic acid (LA) and ∈-caprolactone (CL), using stannous octoate as catalyst, followed by an increase in the molecular weight through urethane linking. The use of 1,4-butanediol results in oligomer molecules with hydroxyl functionality at both ends. The effect of comonomer ratio on the thermal and mechanical properties of the poly(ester-urethane) was investigated. SEC, FTIR, and 13C NMR were used to confirm the formation and structure of the polymer; a random sequence distribution of the comonomer units was concluded along the polymeric chains. All poly(ester-urethanes) were amorphous, with Tg varying from 53 to -45 °C. Poly(ester-urethanes) with a small amount of CL units were rigid, having a tensile modulus of 1700-2100 MPa, maximum stress of 36-47 MPa, and maximum strain of 4-7%. CL-rich poly(ester-urethanes) were highly elastomeric with maximum stress of 9 MPa and with maximum strain over 1000%. Hydrolytic degradation was studied in phosphate buffer solution (pH 7.4) at 37 °C.

    Original languageEnglish
    Pages (from-to)2876-2882
    Number of pages7
    JournalMacromolecules
    Volume30
    Issue number10
    DOIs
    Publication statusPublished - 19 May 1997
    MoE publication typeA1 Journal article-refereed

    Keywords

    • biodegradable plastics
    • epsilon-caprolactone
    • P(LA/CL)
    • PEU
    • poly(ester-urethane) copolymers
    • thermoplastic elastomers

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