华东理工大学学报（自然科学版）2017，Vol.43Issue(6)：784-792,9.DOI:10.14135/j.cnki.1006-3080.2017.06.006
等温退火对PLLGA85/15结晶度、力学性能和降解性能的影响
Effect of Isothermal Annealing on Degree of Crystallinity,Mechanical Properties and Degradation Behavior of PLLGA85/15
摘要
Abstract
The effect of isothermal annealing on the degree of crystallinity,mechanical properties and degradation behavior of a random copolymer poly(L-lactic-co-glycolic acid) with monomer molar ratios of 85/15 (PLLGA85/15) was investigated.The polymer was annealed at the optimal annealing temperature of 130 ℃.Its crystallization behavior after annealing was observed by X-ray diffraction (XRD),and the mechanical properties were tested by universal mechanical experimental machine.The degradation experiments of PLLGA85/15 with different annealing times were performed,and the changes of water adsorption rate,weight loss rate and pH of solution after degradation were observed.The change of polymer molecular weight after degradation was determined by gel chromatography (GPC),change of mechanical properties was measured by differential scanning calorimetry (DSC),and the change of micromorphology of samples was observed by scanning electron microscopy (SEM).As shown by the experimental results,the degrees of crystallinity and mechanical properties were increased with the increasing of annealing time,while kept constant when reached the maximum data.Long time annealing led to accelerated thermal degradation and reduced molecular weight,while short time annealing resulted in increase of the degree of crystallinity and reduction of degradation rate.关键词
等温退火/左旋乳酸乙醇酸无规共聚物/结晶度/降解性能Key words
isothermal annealing/poly (L-lactic-co-glycolic acid)/degree of crystallinity/degradation properties分类
化学化工引用本文复制引用
赵娜,李庆,陈栋梁,马志刚..等温退火对PLLGA85/15结晶度、力学性能和降解性能的影响[J].华东理工大学学报（自然科学版）,2017,43(6):784-792,9.基金项目
湖北省自然科学基金项目面上项目(2012FFC020) （2012FFC020）
湖北省教育厅科研计划项目指导性项目(B20123004) （B20123004）
湖北理工学院校级科学研究项目(11yjz03R) （11yjz03R）
