Abstract
Directly starting from lactic acid (LA) and trimesic acid (TMA), novel biodegradable material poly(lactic acid-trimesic acid) (PLT), a modified polylactic acid (PLA) with terminal carboxyl, was synthesized via melt copolycondensation. The optimal synthetic conditions, including catalyst kinds and dosage, prepolymerization time, copolymerization temperature and time, were discussed. When L-lactic acid (L-LA) and TMA as molar feed ratio n(L-LA)/n(TMA) 120/1 was prepolymerized for 8 h at 140 °C, the copolycondensation catalyzed by 0.9 wt % SnCl2 at 190 °C for 8 h gave PLT with the biggest intrinsic viscosity ([η]) 1.91 dL∙g−1, and the corresponding weight-average molecular weight (Mw) was 14,100 Da. Serial L-PLTs at different molar feed ratios were synthesized and characterized with FTIR, 1H NMR, GPC, DSC, and XRD. Increasing n(L-LA), Mw increased first, and the biggest Mw was 17500 Da at n(L-LA)/ n(TMA) 240/1, then decreased. Using D,L-lactic acid (D,L-LA) instead of L-LA, the influences of LA stereochemical configuration were investigated. The peak phenomenon of Mw was similar, but the biggest Mw was 23,100 Da at n(D,L-LA)/n(TMA) 320/1. The serial L-PLTs had a certain crystallinity (10.2%∼23.0%), while all D,L-PLTs were amorphous. These differences may be in touch with the reaction mechanism of direct melt copolycondensation. The method was simple and practical for the synthesis of PLA biomedical materials applied in drug delivery carrier, and vessel substitution material.
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Acknowledgements
We are grateful to the financial support by Guangdong Provincial Natural Science Foundation of China (No. 5300082) and National Natural Science Foundation of China (No. 20772035). We also thank Dr & Prof. Ling-Ting YANG for helpful discussion.
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Wang, ZY., Luo, YF., Ye, RR. et al. Synthesis of novel biodegradable material poly(lactic acid-trimesic acid) via direct melt copolycondensation and its characterization. J Polym Res 18, 499–508 (2011). https://doi.org/10.1007/s10965-010-9442-0
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DOI: https://doi.org/10.1007/s10965-010-9442-0