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Homo- and hetero-stereocomplexes of substituted poly(lactide)s as promising biodegradable crystallization-accelerating agents of poly(L-lactide)

Authors

  • Hideto Tsuji,

    Corresponding author
    1. Department of Environmental and Life Sciences, Graduate School of Engineering, Toyohashi University of Technology, Tempaku-cho, Toyohashi, Aichi 441-8580, Japan
    • Department of Environmental and Life Sciences, Graduate School of Engineering, Toyohashi University of Technology, Tempaku-cho, Toyohashi, Aichi 441-8580, Japan
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  • Satomi Yamamoto,

    1. Department of Environmental and Life Sciences, Graduate School of Engineering, Toyohashi University of Technology, Tempaku-cho, Toyohashi, Aichi 441-8580, Japan
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  • Ayaka Okumura

    1. Department of Environmental and Life Sciences, Graduate School of Engineering, Toyohashi University of Technology, Tempaku-cho, Toyohashi, Aichi 441-8580, Japan
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Abstract

Accelerated crystallization of poly(L-lactide) (PLLA) homo-crystallites occurred in the presence of poly(L-2-hydroxybutyrate) [P(L-2HB)], poly(D-2-hydroxybutyrate) [P(D-2HB)], and the mixture of P(L-2HB) and P(D-2HB) [P(L-2HB)/P(D-2HB)]. The accelerating effect of incorporated polymers decreased in the following order: P(L-2HB)/P(D-2HB) > P(D-2HB) > P(L-2HB) > none, for heating and isothermal crystallization for Tc of 130 and 135°C and P(D-2HB) > P(L-2HB)/P(D-2HB) > none > P(L-2HB), for cooling. The P(L-2HB)/P(D-2HB) homo-stereocomplex (HMSC) crystallites, P(D-2HB)/PLLA hetero-stereocomplex (HTSC) crystallites, and P(L-2HB) or P(D-2HB) homo-crystallites are found to be promising biodegradable nucleating agents for PLLA homo-crystallization. The P(L-2HB)/P(D-2HB) HMSC crystallites are most effective during isothermal crystallization and nonisothermal crystallization with heating, whereas the P(D-2HB)/PLLA HTSC crystallites are most effective during nonisothermal crystallization with cooling from the melt. In addition to the nucleating effect, the plasticizing effect of free P(2HB) chains increases both G and the PLLA spherulite number per unit mass. These effects result in accelerated crystallization of PLLA homo-crystallites. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011.

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