Title: Controlled Radical Homopolymerization of Acrylic Acid Based on RAFT Polymerization
Abstract: The reversible addition-fragmentation chain transfer(RAFT) free radical polymerization of acrylic acid(AA) was investigated by using 2-{[(dodecylsulfanyl)carbonothioyl]sulfanyl}succinic acid(DCTSS) as chain transfer agent(CTA) in water.The effects of some parameters on the polymerization of acrylic acid was investigated,such as:kinds of initiator,temperature,time,the molar ratio of initiator to RAFT agent,and that of acrylic acid to RAFT agent.The polymerization showed living /controlled characteristics by using 4,4'-azobis(4-cyanovaleric acid) as initiator.The reaction kinetics was linear.The molecular weight of polyacrylic acid (PAA) was controllable and increased linearly with the monomer conversion.The molecular weight distribution of PAA was as narrow as 1.50.Raising the temperature could increase the rate of reaction,reduce the molecular weight distribution,and control the reaction better.Reducing the molar ratio of initiator to RAFT agent could increase the molecular weight,but the rate of the reaction was lower.Increasing the molar ratio of acrylic acid to RAFT agent,the molecular weight also increased,and the relationship between them was linear.The optimal reaction time was 2 h.The well-controlled amphipathic block copolymer PAA-b-PBA was prepared by using PAA as macromolecular RAFT agent and n-butyl acrylate as second monomer.The structures of these products were characterized by 1HNMR and FTIR.
Publication Year: 2009
Publication Date: 2009-01-01
Language: en
Type: article
Access and Citation
AI Researcher Chatbot
Get quick answers to your questions about the article from our AI researcher chatbot