Abstract
Various acids such as aliphatic or carbocyclic fatty or aromatic acids were successfully conjugated into the ending hydroxyl group of poly(l-lactide) (PLLA). The chemical structures of various acid–PLLAs were confirmed by Fourier transform infrared and proton nuclear magnetic resonance analysis. The crystallinity and solubility of the original PLLA were maintained after the terminal conjugation of various acids. The thermal properties were significantly improved, especially the 10% weight-loss temperature that showed an increase of over 80°C for conjugation of aliphatic or aromatic acids as compared to that of the corresponding original PLLA. In addition, more than 60 wt.% of the aliphatic acid–PLLAs was pyrolyzed, and aromatic acid–PLLAs degraded only about 10 wt.% for 150 min, although the original PLLA was pyrolyzed completely at 250°C for 7 min. The thermal stability of PLLA was controlled by the conjugation of aliphatic or aromatic acids into a chain end. These acid–PLLAs may be useful as materials with high thermal stability for various application fields.
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We acknowledge Prof. H. Uyama of the Department of Applied Chemistry, Graduate of Engineering, Osaka University for the TGA measurements.
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Tran, H.T., Matsusaki, M., Akashi, M. et al. Enhanced Thermal Stability of Polylactide by Terminal Conjugation Groups. J. Electron. Mater. 45, 2388–2394 (2016). https://doi.org/10.1007/s11664-015-4329-9
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DOI: https://doi.org/10.1007/s11664-015-4329-9