以PEO-b-PAN嵌段共聚物胶束作模板合成SiO_2-C纳米复合材料

通过阴离子聚合和活性自由基聚合相结合的方法,合成了聚环氧乙烷-聚丙烯腈两亲性嵌段共聚物(PEO-b-PAN).PEO-b-PAN嵌段共聚物在水溶液中自组装形成胶束正硅酸乙酯以胶束作模板进行溶胶-凝胶过程,形成SiO2/PEO-b-PAN复合材料.随后经300℃预氧化,1000℃高温炭化,得到SiO2-C纳米复合材料.用1HNMR、IR、GPC、TGA、TEM、SEM等技术对嵌段共聚物及SiO2-C纳米复合材料进行了表征,结果表明SiO2-C复合材料的结构为SiO2为壳C为核的纳米粒子,粒子的直径为(55±5)nm.

Synthesis of silica-carbon nanocomposite templated by PEO-b-PAN polymeric micelles

In this article,amphiphilic block copolymer poly（ethylene oxide）-polyacrylonitrile（PEO-b-PAN） has been synthesized via the combination of anionic polymerization and atom transfer radical polymerization（ATRP）.Subsequently,block copolymer self-assembled in aqueous solution to form polymeric micelles.And then,the silica/PEO-b-PAN hybrid materials were synthesized by using the polymeric micelles as template and tetraethoxysilane as silica precursor.After preoxidated at 300 °C in air and calcined at 1000 °C in nitrogen,the SiO2-C nanocomposites were synthesized.Block copolymers and the nanocomposites were characterized by 1H NMR,IR,GPC,TGA,SEM,and TEM.The results show that the SiO2-C nanocomposite displays a particle nanostructure with a carbon core in a silica shell,and with a diameter of（55 ± 5） nm.