Abstract
The effect of 1,2,3-triazolium-functionalized PCL-b-PEG block copolymer (PCL-b-PEG(IL)) on crystallization behavior and kinetics of PLA was systematically studied by DSC, POM and XRD. A small amount of micelle of aggregated PCL-b-PEG(IL) containing ionic clusters and a large number of disaggregated PCL-b-PEG(IL) can significantly improve the chain segment mobility of PLA. The glass transition temperature and cold crystallization temperature of PLA gradually decreased with the increase in PCL-b-PEG(IL) or PCL-b-PEG content. Compared with PCL-b-PEG, PCL-b-PEG(IL) decreases the Tg of PLA more obviously because of the strong plasticizing effect of PCL-b-PEG(IL). More importantly, the isothermal crystallization kinetics results manifested that the synergistic effect of heterogeneous nucleation agent of ionic clusters of PCL-b-PEG(IL) and chain mobility promoter of PEG chain segment can enhance the crystallization ability of PLA at all crystallization temperature. The 5 mass% PCL-b-PEG(IL) can induce high amount of stable α-form crystal of PLA after annealing treatment.
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Acknowledgements
This research was supported by the National Natural Science Foundation of China (No. 51903002), Natural Science Foundation of Anhui Education Department (No. KJ2019A0774, KJ2019JD18, KJ2019ZD51), Major science and technology projects of Anhui Province (201903a05020027), Anhui Jianzhu University PhD Startup Fund (2019QDZ22, 2018QD59) and University Collaborative Innovation Project of Anhui province (GXXT-2019-017), WuHu Key Technology Major R&D Projects (2020yf14) and Research Fund for Postdoctoral Researchers in Anhui Province (2020B413).
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Wang, P., Fan, B., Zhou, Y. et al. Effect of 1,2,3-triazolium-functionalized PEG-b-PCL block copolymer on crystallization behavior of poly(L‑lactic acid) as nucleation agent and mobility promoter. J Therm Anal Calorim 147, 3207–3216 (2022). https://doi.org/10.1007/s10973-021-10694-6
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DOI: https://doi.org/10.1007/s10973-021-10694-6