光敏性单分散核-壳树莓状PSt/PAM微球制备  

PREPARATION OF PHOTOSENSITIVE MONODISPERSE CORE-SHELL RASPBERRY-LIKE PSt/PAM MICROSPHERES

作　　者：曹乐[1] 刘莲英[1] 杨万泰[1] 

机构地区：[1]北京化工大学材料科学与工程学院碳纤维及功能高分子教育部重点实验室,北京100029

出　　处：《高分子学报》2012年第2期117-124,共8页Acta Polymerica Sinica

基　　金：国家自然科学基金(基金号20974008);中央高校基本科研业务费(项目号ZD0902)资助项目

摘　　要：采用分散聚合两步加料法,在成核期后向反应体系加入光引发转移终止剂(photo-iniferter)单体2-N,N-二乙基二硫代氨基甲酰氧基乙酸β-甲基丙烯酰氧基乙酯(MAEDCA)制备了核-壳单分散光敏性聚苯乙烯(PSt)微球;进一步,在甲醇介质中,利用光敏性微球在紫外光辐照下引发单体丙烯酰胺(AM)进行表面沉淀接枝聚合,制得了表面亲水、树莓状(raspberry-like)PSt/PAM微球.采用SEM及TEM观察了所得微球的结构和形貌,FTIR、UV-Vis、1H-NMR及XPS分析表明微球的photo-iniferter基团含量随MAEDCA加入量增大而提高,同时补加一定量的MAEDCA、St、AIBN、甲醇及水时所得光敏性PS微球单分散性最好;微球表面接枝PAM后变得亲水并可大量吸附Ag纳米粒子.Monodisperse core-shell microspheres of polystyrene（PSt） contained photo-iniferter moieties were prepared first by a two-stage dispersion polymerization in which β-methacryloxylethyl 2-N,N-diethyldithiocarbamylacetate（MAEDCA） was charged into a reaction system after nucleation.Subsequently,raspberry-like PSt/poly acrylamide（PAM） particles were achieved by an ultraviolet light-induced surface grafting polymerization of acrylamide（AM） using the as-prepared photosensitive PSt particle as an initiator,and in a medium of methanol which is not a good solvent for the grafted chain of PAM.The morphology and core-shell structure of as-produced particles were revealed by scanning electron microscope（SEM） and transmission electron microscope（TEM） observation.Fourier transform infrared spectroscopy（FTIR）,ultraviolet and visible absorption spectroscopy（UV-Vis）,nuclear magnetic resonance（1H-NMR） and X-ray photoelectron spectroscopy（XPS） analyses demonstrated that the degree of incorporated photo-iniferter moieties on particle surface improved with the increase of MAEDCA added in system.In addition,it is advantageous to achieve narrowly distributed microspheres when a mixture of MAEDCA,styrene（St）,2,2′-azodiisobutyronitrile（AIBN）,methanol（MeOH） and H2O were introduced into the system in the second stage of dispersion polymerization.The surface of PSt particles grafted with PAM became hydrophilic,and on which Ag nano-particles were attached readily.

关 键 词：分散聚合 单分散性 核-壳结构 光敏性 树莓状微球 

分 类 号：TQ316.33[化学工程—高聚物工业]