The crystallization behavior of poly(l-lactide)/poly(d-lactide) blends: effect of stirring time during solution mixing

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Blending of poly(l-lactide) and poly(d-lactide) (PLLA, PDLA) results in the formation of poly(lactide) stereocomplex crystallites (SC). For the preparation method, numerous reports employed solution mixing and stirring to receive a product with uniform performance. However, the effect of stirring time during solution mixing on the subsequent crystallization behavior did not clear yet, and which is important for solution crystallization, casting and spinning. In this paper, linear PLLA and PDLA with various molecular weights were synthesized. The PLLA and PDLA solutions were mixed together and stirred for different times before casting. Results revealed that the structures of PLA SC and homochiral crystallites (HC) did not vary with change in the stirring time. More amount of content of SC with uniform structure and less amount of content of HC were produced in the specimens stirred for longer time. When the specimens crystallized either from the melt or from the melt-quenching, less amount of content of crystallites (total crystallinity of SC and HC) was produced and the melting temperature of SC and HC depressed in the specimens that were stirred for longer time. With the increase in molecular weights, the effect of stirring time on the crystallization behaviors declined. This investigation provides a route to tailor the crystallization behavior of PLLA/PDLA specimens.

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This work was financially supported by the National Natural Science Foundation of China (Grants Nos. 51403089 and 21574060), the Major Special Projects of Jiangxi Provincial Department of Science and Technology (Grant No. 20114ABF05100), the Project of Jiangxi Provincial Department of Education (GJJ170229), the Technology Plan Landing Project of Jiangxi Provincial Department of Education (GCJ2011-243), the Outstanding Youth Foundation of Jiangxi Normal University, the China Postdoctoral Science Foundation (2019M652282), and Postdoctoral Science Foundation of Jiangxi Province (2018KY37).

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Correspondence to Jun Shao or Shouzhi Pu.

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Shao, J., Xu, L., Pu, S. et al. The crystallization behavior of poly(l-lactide)/poly(d-lactide) blends: effect of stirring time during solution mixing. Polym. Bull. (2020) doi:10.1007/s00289-020-03103-9

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  • Poly(lactide)
  • Poly(lactide) stereocomplex
  • Crystallization
  • Stirring time
  • Solution mixing