丙烯酰胺/丁基苯乙烯共聚物组成的非均匀性  

Heterogeneity of Composition in the Copolymer of Acrylamide with Butyl Styrene

作　　者：钟传蓉[1] 黄荣华[2] 何文琼[1] 

机构地区：[1]成都理工大学材料与化学化工学院,四川成都610059 [2]高分子材料工程国家重点实验室四川大学高分子研究所,四川成都610065

出　　处：《化学世界》2006年第10期597-601,共5页Chemical World

基　　金：国家重点基础研究发展规划973计划资助项目(G1999022502)

摘　　要：以疏水缔合效应强于苯乙烯的丁基苯乙烯(BST)为疏水单体,采用自由基胶束共聚合方法合成了丙烯酰胺(AM)/丁基苯乙烯(BST)疏水缔合水溶性共聚物(简称:PSAM)。采用元素分析测定PSAM的组成,通过直线截距斜率法得到AM和BST的竞聚率分别为0.76和8.55,说明BST的均聚反应活性较大,导致了BST疏水链段在共聚物分子中的分布存在着非均匀性,而且随着共聚合转化率的增加,这种共聚物组成的非均匀性对共聚物的增粘性能有很大的影响。当Cp=0.3 g/dL时,共聚合转化率分别为20.27%和89.07%的共聚物的溶液表观粘度分别为1283 mPa.s和296mPa.s。Butyl styrene （BST） was used as the hydrophobic monomer which intermolecular hydrophobic association is stronger than that of Styrene, and the hydrophobically associating water-soluble copolymer （PSAM） of acrylamide with BST was synthesized by the micellar free radical copolymerization technique, The molar composition of PSAM was measured by means of elemental analysis. It is found that the reactivity ratio of AM and BST are rAM = 0.76, rBST = 8.55, respectively, which reveals that BST has very high homopolymerization activity and results in the micro-structure heterogeneity of BST in the copolymer molecules that leads to the decrease of the thickening properties of PSAM with the increase of copolymerization conversion. Solution viscosities of copolYmer with copolymerization conversion of 20.27 % and 89.07 % are 11283 mPa·s and 296 mPa·s, respectively when the polymer concentration is 0.3 g/dL.

关 键 词：丁基苯乙烯 丙烯酰胺 疏水缔合 动力学 竞聚率 

分 类 号：TQ326.4[化学工程—合成树脂塑料工业]