嵌段共聚物PS-b-P2VP的合成及表征  

The synthesis and characterization of the block copolymer of PS-b-P2VP

作　　者：陈志军[1] 周思凯[1] 彭凯[1] 方少明[1] 杨晓建[1] 张惠勇[1] 

机构地区：[1]郑州轻工业学院材料与化工学院高分子材料与工程系,河南郑州450002

出　　处：《弹性体》2006年第1期1-4,共4页China Elastomerics

基　　金：国家自然科学基金资助项目(20476101)

摘　　要：采用氰氧稳定自由基聚合技术合成了苹乙烯和2-乙烯吡啶嵌段共聚物（PS—b—P2VP），用凝肢渗透色谱（GPC）表征了聚合物的分子量及其分布，用红外光谱表征了其结构，结果表明，在氮氧稳定自由墓（HTEMPO-）存在下，用过氧化苯甲酰（BPO）引发苯乙烯聚合，当[HTEMPO·]／[BPO]配比为1．8／1时为最佳比例，在此比例下所制备聚合物PS的分子量分布在1．17～1.36范围内；再将该聚苹乙烯溶于2-乙烯吡啶，在（130±2）℃时可以继续引发2-乙烯吡啶的聚合反应，且2乙烯吡啶的聚合反应具有“活性”聚合的特征，共聚物的分子量分布范围在1.16～1．35内，分子量在12930～19670g／mol范围。红外谱图说明共聚物为嵌段共聚物。In this paper, a series of polystyrene and polystyrene-block-poly（2-vinylpyridine） （PS-b- P2VP） were synthesized by using nitrogen-oxide stabilization free radical polymerization initiated by benzoyl peroxide （BP0） in the presence of 4-hydroxyl-2,2,6,6-tetramethylpiperidine-oxyl-1 （HTEMPO·）. The molecular weight and polydispersity of polystyrene and PS-b-P2VP were characterized by gel perme- ation chromatography （GPC）,the structure of them were characterized by fourier transform infrared spectroscopy （FTIR）. Experimental results showed that the best ratio of HTEMPO· to BPO is 1.8/1 and the molecular polydispersities of synthesized polystyrene is in the range of 1.17 to 1.36 under this ratio. Sequentially this ＂polystyrene＂ can initiate the polymerization of 2-Vinylpyridine under （130 ± 2）℃ after being dissolved in 2-Vinylpyridine and the polymerization of styrene has ＂Living＂ nature. The molecular weight of this copolymer is between 12 930 g/mol and 19 670 g/mol and its polydispersities is between 1.16 and 1.35. It＇s proved to be block copolymer by infrared spectroscopy.

关 键 词：活性稳定自由基聚合 嵌段聚合物 聚苯乙烯 聚2-乙烯吡啶 增溶 

分 类 号：TQ330[化学工程—橡胶工业]