Chain transfer agents for raft polymerization in aqueous media
申请人:University of Southern Mississippi
公开号:US20030195310A1
公开(公告)日:2003-10-16
Polymers and copolymers synthesized by means that yield a narrow range of molecular weights can have different properties than polymers synthesized by conventional means. In order to obtain such polymers, however, polymerization must be controlled. One type of controlled polymerization is the reversible addition-fragmentation chain transfer (RAFT) process, which has characteristics of a living polymerization. The present invention discloses a group of dithioesters and trithioesters suitable as chain transfer agents for RAFT polymerization. The present invention also discloses RAFT polymerizations conducted in aqueous media.
Design Criteria for Star Polymer Formation Processes via Living Free Radical Polymerization
作者:Hugh Chaffey-Millar、Martina H. Stenzel、Thomas P. Davis、Michelle L. Coote、Christopher Barner-Kowollik
DOI:10.1021/ma060964w
日期:2006.9.1
transfer (RAFT), R-group approach star polymerizations have been studied via a combined experimental and theoretical approach. From the improved understanding herein developed, design criteria have been suggested to aid in future syntheses of RAFT, R-group approach star polymer. The suggested criteria are as follows. To minimize the quantity of linear polymer in the system, it is important to have
Facile nucleophilic substitution of 3-tert-butyl-dimethylsilyloxyalk-2-enylphosphonium salts
作者:Phil Ho Lee、Minkyoung Cho、In-Sup Han、Sunggak Kim
DOI:10.1016/s0040-4039(99)01438-0
日期:1999.9
Phosphoniosilylation of α,β-enones with TBSOTf and triphenyl-phosphine at 0 °C affords 3-tert-butyldimethylsilyloxyalk-2-enylphosphonium salts, which undergo facile nucleophilicsubstitution with various nucleophiles to give 3-substituted silyl enol ethers in good yields.
Ambient temperature reversible addition–fragmentation chain transfer polymerisation
作者:John F. Quinn、Thomas P. Davis、Ezio Rizzardo
DOI:10.1039/b101794m
日期:——
Reversible addition fragmentation chain transfer was performed
at ambient temperature for the first time.
首次在常温下进行了可逆加成碎片链转移。
Successful Use of RAFT Techniques in Seeded Emulsion Polymerization of Styrene: Living Character, RAFT Agent Transport, and Rate of Polymerization
作者:Stuart W. Prescott、Mathew J. Ballard、Ezio Rizzardo、Robert G. Gilbert
DOI:10.1021/ma011840g
日期:2002.7.1
addition−fragmentation chain transfer (RAFT) polymerization techniques are successfully used to control molecular weight and polydispersity in the seededemulsionpolymerization of styrene. A novel technique was used to assist the transport into the seed particles of a RAFT agent that is of very low water solubility, ensuring the RAFT agent was localized in the particle phase. The polymer produced in these experiments