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Miscibility and crystallization behaviors of stereocomplex-type poly(l- and d-lactide)/poly(methyl methacrylate) blends

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Abstract

Stereocomplex-poly(l- and d-lactide) (sc-PLA) and poly(methyl methacrylate) (PMMA) blends were prepared by solution blending at PMMA loadings from 20 to 80 mass%. The miscibility and crystallization behaviors of the blends have been studied in detail by differential scanning calorimeter. The single-glass transition temperatures (T g) of the blends demonstrated that the obtained system was miscible in the amorphous state. It was observed that the crystallization peak temperature of sc-PLA/PMMA blends was marginally lower than that of neat sc-PLA at various cooling rates, indicating the dilution effect of PMMA on the sc-PLA component to restrain the overall crystallization process. In the study of isothermal crystallization kinetics, the reciprocal value of crystallization peak time (\( t_{\text{p}}^{ - 1} \)) decreased with increasing PMMA content, indicating that the addition of non-crystalline PMMA inhibited the isothermal crystallization of sc-PLA at an identical crystallization temperature (T c). Moreover, the negative value of Flory–Huggins interaction parameter (χ 12 = −0.16) of the blend further indicated that sc-PLA and PMMA formed miscible blends.

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Acknowledgements

This work is supported by the National Science Foundation of China (51021003, 50703042).

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Authors and Affiliations

  1. Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China

    Qinglin Dong, Yijie Bian, Yi Li, Changyu Han & Lisong Dong

  2. Synthetic Resin and Special Fiber Research Center, Changchun University of Technology, Changchun, 130012, China

    Qinglin Dong

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  1. Qinglin Dong
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  2. Yijie Bian
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Correspondence to Changyu Han.

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Dong, Q., Bian, Y., Li, Y. et al. Miscibility and crystallization behaviors of stereocomplex-type poly(l- and d-lactide)/poly(methyl methacrylate) blends. J Therm Anal Calorim 118, 359–367 (2014). https://doi.org/10.1007/s10973-014-3966-1

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