【摘要】 采用无皂乳液聚合法合成了聚(苯乙烯-co-甲基丙烯酰氧乙基三甲基氯化铵)(poly(St-co-DMC))纳米粒子,平均粒径约为100 nm.以此纳米粒子为模板,在接近室温及p H为中性的温和条件下,以四甲氧基硅烷(TMOS)为硅源,合成了poly(St-co-DMC)/Si O2杂化纳米粒子,TEM结果显示该纳米粒子具有明显的核壳结构,Si O2主要沉积在壳层.进一步通过四氢呋喃溶解制备得到具有空心结构的纳米粒子,这种空心结构纳米粒子的FTIR图谱中既有Si O2的信号,也有poly(St-co-DMC)的信号,说明空心纳米粒子的壳层不完全是Si O2,对空心纳米粒子的TGA结果分析计算得到Si O2的含量仅为69.7%,说明纳米粒子的壳层为杂化壳层,并且,这种壳层的厚度随着反应温度的升高、反应时间的延长、TMOS用量的增加及聚合物模板中DMC含量的增加而增大.更多还原

【Abstract】 With the poly( St-co-DMC) as template,TMOS as silicon source,the poly( St-co-DMC) / Si O2 hybrid nanoparticles were synthesized under ambient temperature and neutral p H conditions. The TEM result of sliced sample confirmed that the hybrid nanoparticles possessed core-shell structure and that the Si O2 deposited mainly in the shell of the nanoparticles. Furthermore,the hybrid nanoparticles were dissolved with tetrahydrofuran to obtain the hollow nanoparticles. TEM results showed that the polymer core of the nanoparticles disappeared,generating nanoparticles with hollow structure. In addition,FTIR results confirmed that the hollow nanoparticles had the signal of both Si O2 and polymer which indicated that this hollow nanoparticles not only contained Si O2 but also poly( St-co-DMC). The content of Si O2 in the hollow hybrid nanoparticles of poly( St-co-DMC) / Si O2 was only 69. 7% analyzed by TGA,indicating a left of 30. 3% of polymer,which further confirmed that the hollow nanoparticles possessed hybrid shell. Finally,the effect of the reaction temperature,deposition time,the proportion of polymer / TMOS and the content of DMC in polymer template on the thickness of the hybrid nanoparticles’ shell was studied by TEM. The results showed that the thickness of the hybrid nanoparticles’ shell increased with raising the reaction temperature,increasing the deposition time,the proportion of TMOS / polymer and the higher content of DMC in polymer template.更多还原