文章摘要
成核剂磷酸三钙对左旋乳酸乙醇酸无规共聚物结晶度、力学性能和降解性能的影响
Effect of Nucleating Agent Tricalcium Phosphate on Degree of Crystallinity, Mechanical Properties and Degradation Properties of Poly(L-lactide-co-glycolide)
  
DOI:10.16865/j.cnki.1000-7555.2018.05.015
中文关键词: 成核剂  左旋乳酸乙醇酸规共聚物  结晶度  降解性能
英文关键词: nucleating agent  poly(L-lactic-co-glycolic acid)  degree of crystallinity  degradation properties
基金项目:湖北省自然科学基金项目面上项目(2012FFC020);湖北省教育厅科研计划指导性项目(B20123004);矿区环境污染控制与修复湖北省重点实验室开放基金(20171010)
作者单位
赵 娜1, 张田瑶2, 陈和春2, 马志刚1,3 1. 湖北理工学院 化学与化工学院湖北 黄石 435003 2. 中国科学院成都有机化学研究所四川 成都 6100413. 湖北理工学院 矿区环境污染控制与修复湖北省重点实验室湖北 黄石 435003 
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中文摘要:
      选择机生物材料磷酸三钙(TCP)作为异相成核剂加入到左旋乳酸乙醇酸规共聚物(PLLGA85/15)中,采用X射线衍射仪考察了复合材料的结晶情况,用万能力学实验机测试了材料的力学性能。实验结果表明,添加成核剂TCP可显著提高PLLGA85/15的结晶性能,但强度损失较大。对不同TCP含量的复合材料进行降解实验,考察降解过程中样品吸水率、失重率和降解液pH的变化。用差示扫描量热分析仪(DSC)考察了材料降解后热力学性能的变化,用扫描电镜(SEM)观察了降解后样品的微观形貌变化。降解实验的结果表明退火后的材料降解速率加快,复合材料的降解速率减缓。具体来说,结晶度的提高加速了材料的降解,弱碱性TCP延缓了材料的降解。
英文摘要:
      The effect of tricalcium phosphate (TCP) as heterogeneous nucleating agent on the degree of crystallinity, mechanical properties and degradation behavior of a random copolymer poly(L-lactic-co-glycolic acid) with monomer mole ratios of 85/15 (PLLGA85/15) was investigated by XRD, differential scanning calorimetry (DSC), SEM, and studying the tensile properties and degradation properties. The results indicate that addition of TCP can improve the degree of crystallinity, but the tensile strength decreases. The in vitro degradation behavior was investigated. The changes in the water uptake, mass loss, pH value, surface morphologies and thermal property after degradation indicate that the degradation of the annealed materials is enhanced but the degradation rate of the composite materials slows down, which is the results of two factors. The first is the process of annealing, which can enhance the degradation. The second is TCP, which is alkalescent, delays the degradation rate.
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