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Title:: Effect of molar ratio of DL-LA/GA/TMC on the thermal behavior and mechanical property of the terpolymer

Author(s):: DONG Hao; LIU Yang; MA Lixia; WANG Qin; Li Shangbin; SUN Qian; WANG Chuandong; Shandong Academy of Pharmaceutical Sciences, Shandong Provincial Key Laboratory of Biomedical Polymers, Jinan 250101, China

Keywords:: DL-Lactide; Glycolide; Trimethylene carbonate; Terpolymer; Thermal behavior; Mechanical property

摘要:: 以辛酸亚锡为催化剂，采用本体开环聚合的方法，合成了一组不同摩尔比的DL-LA/GA/TMC三元共聚物。通过GPC、1H-NMR、DSC和力学性能测试，研究不同摩尔比对共聚物热性能以及力学性能的影响。结果表明共聚物组成摩尔比与投料摩尔比基本一致；共聚物为无定形态，其玻璃化转变温度（Tg）随DL-LA含量的增加略有升高，〖JP2〗而随TMC含量的增加明显降低；共聚物的拉伸强度随TMC含量的增加呈现降低的趋势，而断裂伸长率呈先升高后降低的趋势。通过改变TMC的含量有效地提高了材料的韧性，当TMC含量≥35%时，共聚物显示了热塑性弹性体的特征；当TMC含量为50%时，聚合物断裂伸长率达到1778.5%，〖JP〗拉伸强度仍保持在12.4 MPa。

Abstract:: Poly(DL-lactide-co-glycolide-co-trimethylene carbonate) with various DL-lactide/glycolide/trimethylene carbonate (DL-LA/GA/TMC) molar ratio was prepared by ring-opening polymerization in bulk using stannous octoate as a catalyst. The influence of molar ratio on the thermal behavior and mechanical property of the terpolymer was investigated by GPC、1H-NMR、DSC and tensile tests. The results showed that the terpolymer composition was in agreement with DL-LA/GA/TMC feed mole ratio. The terpolymer was amorphous, and their glass transition temperature (Tg) was increased slightly with the DL-LA content increasing, while decreased obviously with the TMC content increasing. With the increase of TMC content, the tensile strength of the terpolymer was decreased, while the elongation at break was firstly increased and then decreased. By changing the content of TMC, the toughness of the material can be improved effectively. When the TMC content is more than or equal to 35%, the terpolymer shows the characteristics of thermoplastic elastomer. When the TMC content is 50%, the elongation at break of the terpolymer reaches 1778.5%, and the tensile strength still remaines at 12.4 MPa.