【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。更多还原

【Abstract】 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.更多还原