表面引发活性聚合SiO2/PMMA核壳复合纳米粒子的制备及表征

在乙醇介质中,通过在窄粒径分布SiO2胶体粒子表面上接枝的α-溴代物引发甲基丙烯酸甲酯的原子转移自由基聚合,制备了具有核壳结构的SiO2/PMMA复合纳米粒子.采用FTIR、TGA和Acoustosizer等表征了该核壳结构粒子的结构与性能、粒径和粒径分布.结果表明:PMMA已经成功接枝到SiO2表面,并且其链长约为8...

Synthesis and Characterisation of SiO_2-PMMA Core/Shell Composite Nanoparticles via Surface-Initiated Living Radical Polymerisation

The structurally well-defined SiO2/PMMA core/shell composite nanoparticles were prepared via surface-initiated atom transfer radical polymerisation(SI-ATRP). Poly(methyl methacrylate) (PMMA) brush was synthesised on narrowly size-distributed colloidal silica particles with surface-grafted α-bromoester initiator in alcoholic media at ambient temperature. The so called core-shell particles of PMMA brush shell grafted from the core surface of colloidal silica particles were characterised by FT-IR spectroscopy, thermogravimetric analysis (TGA) and Acoustosizer. The size and size distribution of the particles were also determined by Mastersizer. The results of FTIR and TGA measurements showed that SiO2 was successfully coated by PMMA with the chain length of 87 nm.