RAFT法在纳米SiO2表面接枝PBA及其对POM的改性研究  

Studies on grafting PBA onto surface of nano-silicon dioxide via RAFT reaction and modification of POM

作　　者：严满清[1] 唐龙祥[2] 刘春华[2] 王海燕[1] 王平华[2] 

机构地区：[1]安徽大学化学化工学院,安徽合肥230039 [2]合肥工业大学化学工程学院,安徽合肥230009

出　　处：《安徽大学学报（自然科学版）》2008年第6期69-73,共5页Journal of Anhui University(Natural Science Edition)

基　　金：安徽省教育厅高校青年教师基金资助项目(2007jq1020)

摘　　要：采用可逆加成-断裂链转移(RAFT)聚合法在纳米二氧化硅(SiO2)表面接枝聚丙烯酸丁酯(PBA),并采用透射电镜(TEM)、广角X射线衍射(WAXD)、差示扫描量热仪(DSC)及热重分析仪(TGA)等手段研究纳米SiO2及SiO2-PBA复合粒子的添加对聚甲醛(POM)结晶性能及热稳定性的影响.结果表明:用RAFT聚合方法有少量的PBA接枝于纳米SiO2表面;纳米SiO2及SiO2-PBA复合粒子的添加不改变聚甲醛的晶型;粒子的添加使用POM结晶温度、熔点和结晶度升高;且粒子的添加均使POM热稳定性提高.In this paper, poly（ butyl acrylate） （PBA） was grafted onto the suface of nano silicon dioxide （SiO2 ） particles through Reversible addition-fragmentation chain transfered （RAFT） polymerization. Moreover, the effects of nano - SiO2 particles and nano SiO2-PBA eomposited particles on the crystallization behaviors and thermal stability of polyoxymethylene （POM） were studied by means of transmission electron microscope （TEM）, wide-angle X-rays diffraction （WAXD）, differential scanning calorimetry （DSC） and thermogravimetric analyzer （TGA）. The results showed that PBA could be grafted on to the surface of nano- SiO2 through RAFF Reaction. Moreover, nano-SiO2particles and nano SiO2-PBA composited particles could not change the crystal type of POM, in comparison with nano SiO2 particles, the heterogeneous nucleus effect of nano SiO2-PBA eomposited particles was more obvious. Both nano SiO2 particles and nano SiO2-PBA composited particles could improve crystallization temperature, crystallinity and melting point of POM. In addition, in comparison with nano SiO2 particles, nano SiO2-PBA composited particles could improve the thermal stability of POM more obviously.

关 键 词：可逆加成-断裂链转移聚合 聚甲醛 纳米SIO2 纳米SiO2-PBA复合粒子 结晶性能 

分 类 号：TQ316.343[化学工程—高聚物工业]