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Title of Journal: J Polym Res

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Abbravation: Journal of Polymer Research

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Springer Netherlands

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DOI

10.1007/s00406-015-0635-8

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1572-8935

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Synthesis of biodegradable material polylactic ac

Authors: ShiHe Luo QunFang Wang JinFeng Xiong ZhaoYang Wang
Publish Date: 2012/09/01
Volume: 19, Issue: 9, Pages: 9962-
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Abstract

To further verify the mechanism of forming multicore structure during the direct melt copolycondensation of lactic acid LA with compounds containing multihydroxyl groups the biodegradable material polylactic acidcosorbitol PLAcoSB was synthesized by using DLlactic acid DLLA and sorbitol SB as starting materials For the molar feed ratio nLA/nSB of 120/1 optimal synthetic conditions were investigated After prepolymerization at 140 °C for 8 h melt copolymerization with the catalysis of SnO 05 wt at 160 °C for 6 h gave a polymer with the biggest intrinsic viscosity η 091 dL•g−1 The copolymer PLAcoSBs obtained at different molar feed ratios were characterized by Fourier transform infrared spectroscopy FTIR proton nuclear magnetic resonance 1HNMR gel permeation chromatography GPC differential scanning calorimetry DSC and Xray diffraction XRD The results show that the weightaverage molecular weight Mw doesn’t increase all the time along with the increasing of the molar feed ratio nLA/nSB but a Mw peak value exists which validates again the special Mw peak phenomenon during the direct melt copolycondensation of LA with the monomers containing multifunctional groups including polyols eg glycerol However compared with the results of using glycerol as the core the mechanism of forming the multicore copolymer is somewhat different due to SB’s different structure All the results show that the Mw peak value of the copolymers with multicore structure is related to not only the number of hydroxyl groups in polyols but also the reactivity of hydroxyl groups resulted from their type and the steric hindrance of hydroxyl groups in the polyolWe are grateful to the financial support by Guangdong Provincial Natural Science Foundation of China No 5300082 the 3rd Talents Special Funds of Guangdong Higher Education grant number GuangdongFinanceEducation2011431 and National Natural Science Foundation of China No 20772035

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