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研究了聚 DL-丙交酯 ( PDL L A)的合成及热降解性能 .发现影响聚合物分子量的关键因素是单体的重结晶、引发剂的浓度以及安瓿瓶在封管时的干燥和真空度 .采用 DSC、TGA分析了PDL L A的玻璃化转变和热分解 .PDLL A是热不稳定聚合物 ,影响其热稳定性的主要因素是残留单体、催化剂和低聚物的含量 ,将聚合物溶解沉淀处理可以延缓其热解速度 ,提高它的热稳定性
The synthesis and thermal degradation properties of poly (DL-lactide) (PDL LA) were investigated.The key factors affecting the molecular weight of the polymer were the recrystallization of monomer, the concentration of initiator and the drying and vacuum of ampoule during sealing The glass transition and thermal decomposition of PDL LA were analyzed by DSC and TGA.DLLA is a thermally labile polymer, and the main factors influencing its thermal stability are the content of residual monomer, catalyst and oligomer. The polymer Dissolution and precipitation treatment can delay the pyrolysis rate and improve its thermal stability