Abstract
Thermal analysis is an effective mean to study the crystallization of polymers. Fast scanning chip calorimetry (FSC) has ultra-high cooling and heating rate and plays an important role in the study of crystallization behavior. The crystallization kinetics of poly (l-lactic acid) (PLLA) with amino polyhedral oligomeric silsesquioxane (POSS-NH2) and polyethylene glycol-grafted POSS (POSS-PEG) was investigated by traditional differential scanning calorimetry (DSC) and FSC. The results show that the addition of POSS-PEG has a better promoting effect on the crystallization rate of PLLA than POSS-NH2. And there are two differences between the results of FSC and DSC: firstly, FSC can effectively avoid the nucleation and crystallization behavior in the cooling process and ensure that the crystallization process occurs completely in the isothermal stage, while DSC cannot; second, the measured crystallization rate by FSC is lower than the traditional DSC data. In a word, POSS plays a role of nucleation agent in PLLA crystallization, and PEG as nucleation accelerator further improves the crystallization rate; FSC can effectively avoid the nucleation and crystallization in the cooling and heating process.
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Acknowledgements
This work was supported by the Natural Science Basic Research Plan in Shaanxi Province of China (Program No. 2021JM‐431) and National Natural Science Foundation of China (Grant no. 21506167). And I would like to thank Professor Wenbing Hu and his team member Yucheng He of Nanjing University for kindly providing the FSC devices and guidance in FSC testing.
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Luo, C., Fang, M., Sun, J. et al. The effect of POSS-NH2 and POSS-PEG on the crystallization kinetics of poly (l-lactic acid) by traditional DSC and fast scanning chip calorimetry. J Therm Anal Calorim 148, 753–766 (2023). https://doi.org/10.1007/s10973-022-11833-3
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DOI: https://doi.org/10.1007/s10973-022-11833-3