纳米二氧化硅补强可生物降解聚酯弹性体的制备与性能  

Structure and Properties of Nanosilica Reinforced Biodegradable Polyester Elastomers

作　　者：乌艳[1] 刘全勇[1] 石锐[1] 刘晓[1] 李丽[1] 张立群[1,2] 

机构地区：[1]北京化工大学北京市新型高分子材料制备与成型加工重点实验室 [2]北京化工大学纳米材料先进制备技术与应用科学教育部重点实验室,北京100029

出　　处：《高分子材料科学与工程》2010年第5期147-150,共4页Polymer Materials Science & Engineering

基　　金：北京市自然科学基金资助项目(2061002);北京市科委研发攻关类课题Z080003032208013资助项目

摘　　要：通过原位聚合和界面改性,制备出SiO2含量0phr～20phr(质量份数)的纳米SiO2/聚(癸二酸-丙三醇-柠檬酸)酯复合材料,并研究了其结构与性能。力学性能测试结果表明,改性纳米SiO2对弹性体表现出了优异的补强效果,拉伸强度可从0.9MPa提高到5.3MPa;扫描电镜(SEM)和透射电镜(TEM)表明,SiO2以纳米网络状态分散于基体中,与基体间界面结合良好;X射线衍射(XRD)谱图从分子短程相互作用的角度反映出SiO2的存在不利于有序结构的生成;差示扫描量热(DSC)曲线显示,随SiO2含量增加,材料的Tg向低温方向移动;降解性能测试表明,SiO2的加入有助于调节材料的降解速度。Silica/poly（sebacate-glycerol-citrate） nanocomposites,in which nanosilica content varied from 0 phr to 20 phr,were prepared by in-situ polymerization and surface modification. The influence of nanosilica contents on the structure and properties was studied. The composites with different silica contents exhibited excellent comprehensive properties relative to unfilled elastomers. The tensile strength improved from 0.9 MPa to 5.3 MPa. SEM and TEM photos showed that the nanosilica dispersed as nano-scale network in the matrix,and the modified nanosilica exhibited good interfacial bonding with the matrix. XRD measurement was applied to investigate the changes in structure on a short-range molecular level,which suggested that the existence of nanosilica limited the formation of ordered structure. The DSC curves demonstrated that the glass transitions of the composites inclined moving toward a lower temperature as the nanosilica content increased. Results of the in vitro degradation test suggested that nanosilica content could adjust the degradation speed of the composites.

关 键 词：聚(癸二酸-丙三醇-柠檬酸)酯 纳米二氧化硅 表面改性 生物降解 

分 类 号：TB383[一般工业技术—材料科学与工程]