RAFT细乳液法合成PMMA-b-PS及其自组装研究  

Synthesis of PMMA-b-PS by RAFT Miniemulsion Polymerization and Their Self-Assembly

作　　者：杨更须[1] 张士真[1,2] 张普玉[1] 

机构地区：[1]河南大学化学化工学院精细化学与工程研究所,河南开封475004 [2]商丘技师学院,河南商丘476000

出　　处：《河南大学学报（自然科学版）》2010年第4期371-375,共5页Journal of Henan University:Natural Science

基　　金：河南省教育厅自然科学计划项目(200510475044)

摘　　要：采用可逆加成-断裂链转移自由基聚合方法(RAFT),在细乳液体系中合成了分子量相对可控的聚甲基丙烯酸甲酯-聚苯乙烯嵌段共聚物(PMMA-b-PS)及PMMA均聚物.用FTIR1、H-NMR、GPC对聚合物结构和组成进行了表征.用TEM观察了PMMA-b-P/PMMA在选择性溶剂四氢呋喃/环己烷中的自组装行为,发现随着均聚物含量的增加,胶束形态由分散的球形转变为球形和不规则形态的混合物,胶束尺寸也有所增大.混合溶剂中四氢呋喃的含量也对胶束形态有所影响,随着四氢呋喃含量的增加,胶束有彼此聚集的趋势,在THF含量为60%时,胶束尺寸达到大约400 nm,是实验中所观察到的最大胶束.Poly（methyl methacrylate）-b-polystyrene block copolymers and the corresponding PMMA homopolymer with controlled molecular weight were synthesized in miniemulsion system by using reversible addition-fragmentation chain transfer polymerization.The structure and the composition of these copolymers were characterized by means of FTIR,1H-NMR and GPC.Their self-assembly in mixed solvent tetrahydrofuran/cyclohexane（THF/CYH） was studied.The effects of different weight ratios of PMMA homopolymer to block copolymer and different THF contents in mixed solvent on the micellar morphology were both discussed.Detailed micelle structural information was extracted from transmission electron microscopy（TEM）.The morphologices changed from well-proportioned and dispersed spherical micelles to large-sized and irregular micelles when changing the weight ratio of PMMA homopolymer.The effect of different THF contents in the mixed solvent on the micellar morphology is that increasing the THF content lead to the formation of large-sized micelles and the aggregation of the neighboring micelles.When the THF content is 60 %,the size of the micelles is about 400 nm,which is the largest of the spherical micelles observed in the research.

关 键 词：可逆加成-断裂链转移聚合 细乳液 嵌段共聚物 自组装 胶束 

分 类 号：O631.1[理学—高分子化学]