窄分散聚乙烯基倍半硅氧烷纳米微球的合成与表征

Synthesis and characterization of narrowly dispersed polyvinylsilsesquioxane nanospheres

以氢氧化钠（NaOH）为催化剂、十二烷基苯磺酸钠/脂肪醇聚氧乙烯醚（SDBS/AEO-3）为复合乳化剂,将乙烯基三乙氧基硅烷（VTES）置于水体系中进行水解缩合反应,制得了一种窄分散的聚乙烯基倍半硅氧烷（PVSQ）纳米微球.采用红外光谱仪（FT-IR）对PVSQ的结构进行了表征,并用纳米粒度仪、扫描电镜（SEM）、热重分析仪（TGA）和X射线衍射仪（XRD）等分别对PVSQ的平均粒径、微观形态、耐热稳定性和晶型进行了测定.结果表明,PVSQ具有预期的结构;控制NaOH和复合乳化剂的用量分别为0.05-0.15wt%和0.2-0.4wt%,即可制得平均粒径在100nm左右、窄分散的PVSQ微球;制得的PVSQ具有较好的耐热稳定性和不定型结构.

A sort of narrowly dispersed polyvinylsilsesquioxane （PVSQ） nanospheres were fabricated via the hydrolysis-condensation reaction of vinyltriethoxysilane （VTES） in aque-ous solution and sodium hydroxyl was used as catalyst, sodium dodecyl benzene sulfonate/ fatty alcohol-polyoxyethylene ether as mixed emulsiiiers. Structure of PVSQ was conformed by FT-IR . The laser nanometer, scanning electron microscope （SEM） , thermogravimetric analyzer （TGA） ,X-ray diffractometer （XRD） were utilized to characterize the average particle size, micro-morphology, thermal stability and crystal form of PVSQ. Results indicate that a series of narrowly dispersed PVSQ nanospheres with an average particle size of near 100nm could be prepared while the doses of NaOH and mixed emulsifiers were controlled as 0. 05？0. 15 wt% and 0. 2？0. 4 wt%, respectively. It possessed the favorable thermal stability and the undefined structure.