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Crystal and Thermal Properties of PLLA/PDLA Blends Synthesized by Direct Melt Polycondensation

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Abstract

We herein report the effects of the component ratio and method of blending on the synthesis of stereocomplex poly(lactic acid) (SC-PLA) based on poly(l-lactic acid) (PLLA) and poly(d-lactic acid) (PDLA) prepolymers. PLLA and PDLA were prepared by direct melt polycondensation of lactic acid (DMP). Combined with the dual catalyst system, PLA prepolymers with Mw more than 20,000 were prepared by DMP. PLLA was mixed by powder blending or melt blended with PDLA. It is revealed that melt-point and spherulite growth rate of SC-PLA is strongly dependent on the perfection of SC structure. The melt point of PLA can be increased by nearly 50 °C because of the particular strong intermolecular interaction between PLLA and PDLA chains. Solid-state polycondensation (SSP) is an efficient method to increase the molecular weight of SC-PLA, but it can have a negative effect on the regularity of linear chains of SC-PLA. Thermogravimetry analyzer (TGA) results show that SC structure cannot cause the delay reaction on the thermal degradation of PLA.

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Acknowledgments

This work is supported by the National High Technology Research and Development Program of China (No. 2006AA02Z248), the Program of Shanghai Subject Chief Scientist (No. 07XD14029) and the fund of Shanghai International co-operation of Science and Technology (No. 075207046).

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Authors and Affiliations

  1. Institute of Nano- and Bio-Polymeric Materials, School of Material Science and Engineering, Tongji University, 200092, Shanghai, China

    Dakai Chen, Jing Li & Jie Ren

  2. Key Laboratory of Advanced Civil Engineering Materials, Ministry of Education, Tongji University, 200092, Shanghai, China

    Jie Ren

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  1. Dakai Chen
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  2. Jing Li
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Correspondence to Jie Ren.

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Chen, D., Li, J. & Ren, J. Crystal and Thermal Properties of PLLA/PDLA Blends Synthesized by Direct Melt Polycondensation. J Polym Environ 19, 574–581 (2011). https://doi.org/10.1007/s10924-011-0301-9

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  • DOI: https://doi.org/10.1007/s10924-011-0301-9

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