利用硅烷偶联剂KH-550处理纳米二氧化硅(SiO2)表面,得到氨基化的SiO2,再通过溴异丁酸缩水甘油酯与氨基的开环反应,在SiO2表面同时键接了开环聚合(ROP)的引发剂-OH和原子转移自由基聚合(ATRP)的引发剂-Br(SNPs-f-OH/Br).以SNPs-f-OH/Br为引发剂,分别进行ROP和ATRP,在纳米SiO2表面接枝了聚己内酯(PCL)和聚苯乙烯(PS)混合聚合物刷(Mixed brush).采用红外光谱、透射电镜、热失重、凝胶渗透色谱等方法对所得到的复合粒子进行了表征和测试.研究结果表明,混合聚合物刷成功接枝到了纳米SiO2表面,通过控制聚合时间可以控制2种接枝聚合物的相对分子质量.本方法为纳米粒子表面接枝混合聚合物刷提供了一种简便的方法.
Initiator simultaneously bearing a hydroxyl group,an initiator for ring-opening polymerization (ROP)and a bromine moiety,an initiator for atom transfer radical polymerization (ATRP)were anchored onto silica nanoparticles by reaction between amino silica functionalized silica nanoparticles and glycidol-2-bromoisibutyrate.Mixed poly(ε-caprolactone)/polystyrene (PCL/PS) brushes were grafted onto silica nanoparticles by combination of surface-initiated ROP and ATRP,respectively.FT-IR,TEM,TGA and GPC were employed to characterize the resultant hybrid nanoparticles.The results show that the mixed PCL/PS brushes are successfully grafted on the silica nanoparticles surface and the molecular weight of the grafted PCL and PS are controllable by controlling the conversion of monomers.This method provides a facile approach for grafting mixed polymer brushes onto nanoparticles.
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