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.
出处
《精细化工》
EI
CAS
CSCD
北大核心
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)~~
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
reversible addition-fragmentation chain transfer polymerization
block copolymer
acrylic acid
n-butyl acrylate
surface activities
