TiO_2/PBA/PMMA核壳粒子的制备与表征  

Preparation and characterization of TiO_2/PBA/PMMA core-shell particles

作　　者：李晓明[1] 马铁成[1] 刘贵山[1] 王占齐[1] 

机构地区：[1]大连轻工业学院化工与材料学院,辽宁大连116034

出　　处：《大连轻工业学院学报》2006年第4期257-261,共5页Journal of Dalian Institute of Light Industry

摘　　要：纳米粒子是热力学不稳定体系,容易发生颗粒团聚。为了更好地改善纳米粒子的分散性,本文报道利用乳液聚合的方法制备以表面处理过的纳米二氧化钛为核丙烯酸丁酯和甲基丙烯酸甲酯为壳的TiO2/PBA/PMMA复合粒子。分析二氧化钛、乳化剂、引发剂、反应温度和超声震荡时间等因素对聚合反应单体转化率的影响,并表征核壳复合粒子。结果表明,利用乳液聚合方法制备的二氧化钛粒子为核壳结构,平均粒径为251 nm,其粒径分布较未改性纳米TiO2明显变窄,改善了纳米粒子的分散性。Nano-particles are likely accumulative and the system is thermodynamics unstable. In order to improve the dispersion of nano-particles, TiO2/PBA/PMMA core-shell composite particles are prepared by emulsion polymerization, with organized titanium dioxide as the core and acrylic ester monomers as the shell. Factors effecting the polymerization rate of acrylic ester monomers are analyzed, such as organized titanium dioxide, monomer proportion, initiator, emulsion, temperature and ultrasonic time. The particles＇ composition is also observed. The results show that the prepared TiO2 particles is superior in core-shell structure withan average size of 251 nm. The distribution of modified nanoTiO2 becomes obviously narrower and dispersion of the nanoarticles is improved.

关 键 词：纳米粒子 核壳粒子 乳液聚合 纳米TIO2 

分 类 号：TQ134.11[化学工程—无机化工]