为了改善聚合物粒子与SiO_2粒子之间的亲和力厦SiO_2粒子在聚合物粒子表面的吸附,首先使用共单体4-乙烯基吡啶(4VP)功能化苯乙烯(PS)粒子,合成了聚(苯乙烯-共-4-乙烯基吡啶)(P(St-4VP))粒子.然后在NH_4OH/乙醇介质中,将溶胶-凝胶法生成的SiO_2粒子包覆在P(St-4VP)粒子表面,聚合物核被溶解得到SiO_2空心纳米微球.随着P(St-4VP)粒子中共单体4VP含量以反正硅酸乙酯(TEOS)用量增加,SiO_2空心纳米微球的壳层厚度增加,且壳层表面变得粗糙.随着PVP用量增加,SiO_2空心纳米微球的平均尺寸下降,其壳层从松散粗糙变得致密光滑.NH_4OH用量增加对SiO_2空心纳米微球尺寸和形态的影响不大.
The hollow SiO_2 nanospheres form silica-coated P (styrene-co-4-vinylpyridine) (P (St-4VP)) particles were synthesized. The SiO_2 coating and the solution of P(St-4VP) cores were accomplished in one NH_4OH/ethano medium, the synthetic method was thus a simple and low-cost. The P(St-4VP) particles were synthesized first by copolymerization of the styrene and 4-vinylpyridine (4VP). The intention of introduction of the 4VP as comonomer was function of the polystyrene (PS) particles, which provide affinity between the polymer particles and SiO_2 and accelerate adsorption of the SiO_2 particles on the polymer particles surface. The thickness and roughness of the shell of the hollow SiO_2 nanospheres increased with increasing content of 4VP and tetraethoxysilane (TEOS). The size of the hollow SiO_2 nanospheres decreased with increasing PVP content. The size and morphology of the hollow SiO_2 nanospheres kept unchanged when NH_4OH dosage is enhanced from 0.425 g to 1.700 g.
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