丙烯酰胺多面体低聚倍半硅氧烷在超临界CO_2中的RAFT聚合  

RAFT Polymerization of Acrylamide Polyhedral Oligometic Silsesquioxane in Supercritical CO_2

作　　者：程龙[1] 边仲轩 丁敏源 赵萌[1] 李慧[1] 

机构地区：[1]华东理工大学材料科学与工程学院,上海200237

出　　处：《高等学校化学学报》2015年第10期2067-2072,共6页Chemical Journal of Chinese Universities

基　　金：国家科技部国际合作项目(批准号:2010DFB70470)资助~~

摘　　要：以超临界CO2为聚合介质,硫代苯甲酰基特丁基硫酯(TTBT)为链转移剂,通过可逆加成-断裂链转移(RAFT)聚合制备了聚丙烯酰胺多面体低聚倍半硅氧烷(PAMPOSS)均聚物及其与甲基丙烯酸甲酯(PMMA)的嵌段共聚物(PAMPOSS-b-PMMA).对产物结构组成和分子量及其分布进行表征.结果表明,在TTBT的控制下,POSS的均聚物和嵌段共聚物具有高分子量及窄分子量分布.含POSS单体在超临界CO2中为均相聚合,POSS聚合物的结晶性在一定程度上影响其在超临界CO2中溶解性.Polyacrylamide（ PAM） isobutyl-polyhedral oligometic silsesquioxane（ POSS）（ PAMPOSS）homopolymer and PAMPOSS-b-PMMA（ polymethyl methacrylate） block copolymers were prepared via reversible addition-fragmentation transfer（ RAFT） polymerization using benzenecarbodithioic acid 1,1-dimethylethyl ester as the RAFT agent in supercritical CO2. The products were characterized. The results show that polymerization reaction in supercritical CO2 is well controlleded. Both of PAMPOSS and PAMPOSS-b-PMMA have high degree of polymerization（ DP） and low polydispersity index（ PDI）. It can be also found that the polymerization of AM-POSS is a homogeneous reaction,and the solubility of POSS containing polymers in supercritical CO2 is effected by the crystallinity of POSS.

关 键 词：超临界CO2 低聚倍半硅氧烷(POSS) 硫代苯甲酰基特丁基硫酯(TTBT) 可逆加成-断裂转移(RAFT)聚合 

分 类 号：O631[理学—高分子化学]