热响应性磁性复合微粒的制备及性质  

Preparation and properties of thermoresponsive magnetic composite microparticles

作　　者：刘维俊[1] 桂日军[1,2] 董瑾[1] 朱贤[1] 郭强[1] 

机构地区：[1]上海应用技术学院化工系,上海200235 [2]上海海洋大学应用化学系,上海200090

出　　处：《化学研究与应用》2009年第5期756-759,共4页Chemical Research and Application

基　　金：上海应用技术学院基金项目(KJ2008-09)

摘　　要：滴定水解法制备的Fe3O4磁流体,与单体N-异丙基丙烯酰胺(NIPAM)和α-甲基丙烯酸(MAA),在一定的条件下沉降聚合,制备了Fe3O4/P(NIPAM-MAA)复合微粒。对其形态及性能进行研究表明,复合微粒呈现核壳结构的规则球形,溶胀态和收缩态的平均粒径分别为334.7nm和141.5nm。复合颗粒中的Fe3O4颗粒质量分数为1.9%,当外磁场为104Oe时,复合微粒的饱和磁化强度(Ms)为0.6306emu/g。分散在水溶液中的复合微粒在30℃～36℃之间发生了体积相转变,表现出温度敏感性。在低pH溶液中的体积相转变十分显著,随pH逐渐增大,其体积相转变温度(VPTT)显示向高温迁移。Fe3O4/P（NIPAM-MAA） muhiresponsive composite microparticles were synthesized by deposition co- polymerization of N-isopropylacylamide （NIPAM）, α-methacryhc acid （MAA） and Fe3O4 magnetic fluid, which was prepared by the titration hydrolysis method firstly. SEM measurement shows that the morphology of magnetic polymer microparticle is a core/shell shape and regular sphericity,average diameters in sweLling and shrinking state are 334.7 nm and 141.5 nm respectively. The proportion of Fe3O4 magnetic particles as a core in composite microparticle is 1.9 wt%, the saturation magnetization intensity （Ms） is 0.6306 emu/ g in the external magnetic field of 10^4 Oe. The synthesized microparticles in aqueous solution occurred a volume phase transition between 30℃～ 36℃, indicating that magnetic polymer microparticles possess thermo-sensitivity. Meanwhile, at lower pH, phase transition was very prominent and volume phase transition temperatures （VPTT） transferred to higher temperatures as pH value increased gradually.

关 键 词：磁性复合微粒 N-异丙基丙烯酰胺 体积相转变 磁流体 

分 类 号：O648.1[理学—物理化学]