论文部分内容阅读
将经过硅烷化处理的偶联剂-γMPS接枝到纳米SiO2表面,然后在引发剂AIBN的作用下引发单体MMA发生自由基聚合包覆。利用FTIR、TG、CA(接触角)以及TEM等手段分别表征了改性工艺条件对粒子改性前后化学组成结构、接枝率、表面亲水性以及形貌等的影响。系统研究了单体用量、引发剂用量以及反应时间对SiO2/γ-MPS/PM-MA纳米复合粒子接枝改性效果的影响。结果表明,经过PMMA接枝包覆制得了高接枝率的复合粒子,并大大改善了纳米粒子的分散性。
The silane coupling agent-γMPS grafted to the surface of nano-SiO2, and then initiated by the initiator AIBN monomer MMA free radical polymerization coating. The effects of modification conditions on the chemical composition, grafting ratio, surface hydrophilicity and morphology of the particles before and after modification were characterized by means of FTIR, TG, CA (contact angle) and TEM. The effects of monomer amount, initiator dosage and reaction time on the graft modification of SiO2 / γ-MPS / PM-MA nanocomposite particles were systematically studied. The results showed that the composite particles with high grafting rate were obtained by grafting PMMA, and the dispersion of the nanoparticles was greatly improved.