β-磷酸三钙对聚L-乳酸非等温结晶、熔融行为和热稳定性的影响  

Effect of β-tricalcium phosphate on the non-isothermal crystallization,melting behavior,and thermal stability of poly(L-lactic acid)

作　　者：李波[1] 屈一鸣[1] 桂钱欢 王群波[1] 

机构地区：[1]重庆医科大学附属永川医院骨科,重庆402160

出　　处：《应用化工》2016年第12期2317-2320,2325,共5页Applied Chemical Industry

基　　金：重庆市卫生和计划生育委员会医学科研计划项目(20142057);永川区科委自然科学基金计划项目(Ycstc;2015nc5025)

摘　　要：为充分认识添加剂对聚乳酸热性能的影响,以四水硝酸钙和磷酸氢二铵为原料制备了β-磷酸三钙,分别考察了β-磷酸三钙对聚L-乳酸非等温结晶行为、熔融行为和热稳定性的影响。非等温结晶行为显示β-磷酸三钙作为异相成核剂可显著提升聚L-乳酸的起始结晶温度、结晶峰值温度以及非等温结晶焓;而降温速率的增加则会削弱β-磷酸三钙的成核效应。熔融行为测试进一步证实了β-磷酸三钙对聚L-乳酸的结晶加速效应,同时β-磷酸三钙的含量以及结晶温度都会影响聚L-乳酸的熔融行为。β-磷酸三钙的加入并不能改变聚L-乳酸的热失重行为,且热分解起始温度还略有下降。β-Tricalcium phosphate was prepared through calcium nitrate and ammonium phosphate to evaluate its influence on polymer. The effect of β-tricalcium phosphate on the non-isothermal crystallization,melting behavior,and thermal stability of poly（ L-lactic acid） was investigated. Non-isothermal crystallization behavior showed that β-tricalcium phosphate,as a heterogeneous nucleating agent,could significantly increase the onset crystallization temperature,the crystallization peak temperature,and the crystallization enthalpy,but the increase of cooling rate would weak the nucleating effect of β-tricalcium phosphate.Melting behavior results further indicated the acceleration effect of β-tricalcium phosphate for poly（ L-lactic acid）,and both the β-tricalcium phosphate concentration and crystallization temperature also significantly affected the melting behavior. The addition of β-tricalcium phosphate could not change the thermal stability of poly（ L-lactic acid）,however,β-tricalcium phosphate caused the onset thermal decomposition temperature to slightly decrease.

关 键 词：聚L-乳酸 Β-磷酸三钙 非等温结晶 熔融行为 热稳定性 

分 类 号：TQ322.4[化学工程—合成树脂塑料工业]