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Impact of Annealing on the Melt Recrystallization of a-PDLA/α-PLLA Double-layered Films

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Abstract

Poly(lactic acid) (PLA) as a bio-based polymer with biodegradability and biocompatibility has attracted much attention. To manipulate its properties for different applications, regulation of crystal structure and crystalline morphology becomes an attractive research topic. In this work, the structure evolution of layered samples containing an amorphous poly(D-lactide) (PDLA) layer and a crystalline poly(L-lactide) (PLLA) layer with highly oriented edge-on α lamellar crystals after annealing at 150 °C or/and after melt-recrystallization has been studied by AFM, FTIR, and TEM combined with electron diffraction. The results demonstrate that melt recrystallization of the as-prepared sample leads to the formation of abundant randomly oriented PLA stereo-complex (PLA SC) crystals. Annealing at 150 °C results in the formation of a small amount of oriented PLA SC crystals at the interface. These PLA SC crystals show great impact on the recrystallization behavior of sample after melting at 190 °C and then crystallizing at 90 °C. First, they impede the mutual diffusion of the overlying PDLA and underlying PLLA, and thus reduce their stereocomplexation ability as manifested by the decreased amount of PLA SC crystals. Second, they act as substrate to initiate the epitaxial crystallization of the overlying PDLA and underlying PLLA, which ensures the production of a highly oriented structure of PDLA and PLLA after melt recrystallization again.

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Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (Nos. 52027804 and 22022501), Postgraduate Independent Innovation Project (No. B2022KY004, Qingdao University of Science and Technology).

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Authors and Affiliations

  1. Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-plastics, Qingdao University of Science & Technology, Qingdao, 266042, China

    Yun-Peng Li, Hao-Ran Shen, Shao-Juan Wang, Hao Zhang, Jian Hu, Rui Xin & Shou-Ke Yan

  2. State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, China

    Xiao-Li Sun & Shou-Ke Yan

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  1. Yun-Peng Li
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Correspondence to Rui Xin or Shou-Ke Yan.

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Shou-Ke Yan is an associate editor for Chinese Journal of Polymer Science and was not involved in the editorial review or the decision to publish this article. All authors declare that there are no competing interests.

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Li, YP., Shen, HR., Wang, SJ. et al. Impact of Annealing on the Melt Recrystallization of a-PDLA/α-PLLA Double-layered Films. Chin J Polym Sci 42, 230–238 (2024). https://doi.org/10.1007/s10118-023-3035-y

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