The effect of POSS-NH 2 and POSS-PEG on the crystallization kinetics of poly ( l -lactic acid) by traditional DSC and fast scanning chip calorimetry
Journal of Thermal Analysis and Calorimetry(2022)
摘要
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-NH 2 ) 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-NH 2 . 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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关键词
Fast scanning chip calorimetry,Crystallization kinetics,Nucleation agent,Nucleation accelerator,Poly (l-lactic acid),Polyhedral oligomeric silsesquioxane
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