Abstract
In this work, acetylated nanocellulose (ANC) were prepared by acetylation of cellulose nanocrystals (CNC), and the polylactic acid/CNC (PLA/CNC) and PLA/ANC composites were prepared by solution blending method. Then the effects of CNC and ANC on the crystallization kinetics and thermal stability of PLA were studied by differential scanning calorimetry (DSC), polarized light microscope (POM) and thermogravimetric analysis (TGA). DSC results indicate that no crystallization behavior occurs during the cooling process from melt, but cold crystallization peak appears in the heating curve. With the addition of CNC, the temperature of cold crystallization increases. With the addition of ANC, the crystallization behavior can be observed during cooling process and the cold crystallization temperature decreases, indicating that the adding of ANC promotes the crystallization ability dramatically. The POM results show that both CNC and ANC can promote the nucleation density of PLA crystals. In terms of isothermal crystallization after cooling at 300°C/min, the addition of CNC has little positive effect on the crystallization rate of PLA, while the crystallization rate is significantly improved by the addition of ANC. In addition, CNC can slightly promote the maximum thermal decomposition temperature of PLA, while ANC can’t.
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This work was supported by the Natural Science Basic Research Plan in Shaanxi Province of China (Program no. 2021JM-431).
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Minggang Fang, Luo, C., Guo, X. et al. The Effect of Cellulose Nanocrystals and Acetylated Nanocellulose on the Crystallization Kinetics and Thermal Stability of Polylactic Acid. Polym. Sci. Ser. A 64, 802–817 (2022). https://doi.org/10.1134/S0965545X22700523
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DOI: https://doi.org/10.1134/S0965545X22700523