Abstract
Thermal decomposition behavior of Poly(L-lactic acid) (PLLA) and PLLA composites after different heat treatment were investigated using thermogravimetric analysis. Firstly, the thermal decomposition results of neat PLLA showed that the decomposition of PLLA was a first-order kinetic reaction, and thermal decomposition kinetics indicated that the heat treatment significantly affected activation energy of thermal decomposition of PLLA. The measurement results also exhibited that the onset decomposition temperature of PLLA treated below 115°C was lower than that of the pristine PLLA. Then, the effect of additive CaCo3 on the thermal decomposition behavior of PLLA was evaluated. The addition of CaCo3 could significantly improve the crystallization performance of PLLA, but the CaCo3 did not change the decomposition trend of PLLA, and the thermal decomposition behavior of PLLA/CaCo3 composites after isothermal heat treatment was similar to that of PLLA. However, the thermal decomposition activation energy of PLLA/CaCo3 is lower than that of PLLA.
Highlights
Poly(L-lactic acid) (PLLA) is one of the most important biodegradable polymers [1]
The addition of N, N'-bis(benzoyl)sebacic acid dihydrazide enhanced the crystallization rate of PLLA, and thermogravimetric analysis showed that the thermal stability of PLLA with N, N'-bis(benzoyl)sebacic acid dihydrazide was enhanced, indicating that there were strong hydrogen bonds between N, N'-bis(benzoyl)sebacic acid dihydrazide and PLLA matrix
Yeng-Fong Shih et al [5] prepared the PLA/banana fiber composites though melt blending technologies, the thermogravimetric analysis showed that the decomposition temperatures of PLLA reinforced by the banana fiber were smaller than those of the pristine PLA
Summary
Poly(L-lactic acid) (PLLA) is one of the most important biodegradable polymers [1]. There exist many literatures about PLLA and its composites based on PLLA [2, 3], and the addition of a functional additive can significantly improve the properties of PLLA. Yeng-Fong Shih et al [5] prepared the PLA/banana fiber composites though melt blending technologies, the thermogravimetric analysis showed that the decomposition temperatures of PLLA reinforced by the banana fiber were smaller than those of the pristine PLA. Meng et al [6] reported that the addition of montmorrilonite considerably decreased the thermal decomposition rate and shifted the peak rate to a higher temperature compared to that of PLA composites with wood. There exists relevant literature to investigate the thermal decomposition kinetics of PLLA composites. In this article, we focus on the thermal decomposition behavior of PLLA and PLLA/CaCO3 composites after heat treatment at different temperatures to illustrate the role of heating rate, heat treatment process and additive in decomposition behavior of PLLA. The related results can be used to help us further investigate the properties of PLLA to widen the application field of PLLA and composites
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