聚丙烯酸-b-聚丙烯酸丁酯的RAFT水溶液聚合及其性能  

Synthesis and Properties of PAA-b-PBA Based on RAFT Polymerization in Water

作　　者：沈晓亮[1] 周建华[1,2] 马建中[1] 

机构地区：[1]陕西科技大学教育部轻化工助剂化学与技术重点实验室,陕西西安710021 [2]浙江温州轻工研究院,浙江温州325003

出　　处：《精细化工》2010年第3期289-295,299,共8页Fine Chemicals

基　　金：国家高技术研究发展计划(863计划)项目(2008AA03Z311);国家自然科学基金面上项目(20674047);陕西省自然科学研究项目(2007E110);陕西科技大学研究生创新基金;温州市科技计划项目(H20080012)~~

摘　　要：该研究首先以2-{[(十二烷基硫基)硫代甲酰基]硫烷基}琥珀酸为链转移剂(CTA)在水溶液中调控丙烯酸(AA)进行可逆加成-断裂链转移自由基聚合(RAFT),再以得到的聚丙烯酸为大分子RAFT试剂,丙烯酸正丁酯(BA)为单体,进行扩链反应,得到聚丙烯酸-b-聚丙烯酸正丁酯。用红外光谱对产物结构进行了表征。考察了合成条件n(V501)/n(CTA)、n(AA)/n(CTA)、n(V501)/n(PAA-RAFT)、n(BA)/n(PAA-RAFT)对聚合物的表面张力、乳化性、起泡性和泡沫稳定性的影响。结果表明,当n(V501)/n(CTA)=0.2、n(AA)/n(CTA)=20、n(V501)/n(PAA-RAFT)=0.1、n(BA)/n(PAA-RAFT)=20时,得到的聚丙烯酸-b-聚丙烯酸正丁酯的水溶液表面活性最大,表面张力最低为30.89 N/m,乳化性最强,乳状液稳定时间达到1 082 s,起泡性和泡沫稳定性最弱,泡沫高度为17.01 mm,稳定时间为210 s。The reversible addition-fragmentation chain transfer（RAFT） free radical polymerization of acrylic acid（AA） was investigated by using 2-{[（dodecylsulfanyl）carbonothioyl]sulfanyl}succinic acid as chain transfer agent（CTA） in water.Then the well-controlled amphipathic block copolymer PAA-b-PBA was prepared by using PAA-RAFT as macromolecular RAFT agent and n-butyl acrylate（BA） as second monomer.The structures of products were characterized by FTIR.The effects of some synthetic parameters on surface tension,emulsifying property,foamability and foam stability of PAA-b-PBA were investigated,such as the molar ratio of V501 to CTA,the molar ratio acrylic acid to CTA,the molar ratio of V501 to PAA-RAFT and the molar ratio of n-butyl acrylate to PAA-RAFT.As a result,when n（V501）/n（CTA） was 0.2,n（AA）/n（CTA） was 20,n（V501）/n（PAA-RAFT） was 0.1,n（BA）/n（PAA-RAFT） was 20,the surface tension of PAA-b-PBA aqueous solution was as low as 30.89 N/m,the emulsifying property was the strongest and the emulsion can be stabilized for 1 082 s,the foamability and the foam stability were the weakest,the foam height was as low as 17.01 mm,and the foam could be stabilized for 210 seconds.

关 键 词：可逆加成-断裂链转移自由基聚合 嵌段共聚物 丙烯酸 丙烯酸丁酯 性能 

分 类 号：O631.5[理学—高分子化学]