Living Free Radical Polymerization with Reversible Addition−Fragmentation Chain Transfer (RAFT Polymerization): Approaches to Star Polymers
作者:Roshan T. A. Mayadunne、Justine Jeffery、Graeme Moad、Ezio Rizzardo
DOI:10.1021/ma021219w
日期:2003.3.1
multiarm star polymers by radicalpolymerization with reversibleaddition−fragmentationchaintransfer (RAFT) is described. When the precursor RAFT agents to star polymers are trithiocarbonate derived, fragmentation of the radicalintermediate can lead to different products depending on the leaving abilities of the two groups attached to sulfur. To demonstrate this, two types of RAFT agents, ones that
Multiarm organic compounds for use as reversible chain-transfer agents in living radical polymerizations
作者:Roshan T.A Mayadunne、Graeme Moad、Ezio Rizzardo
DOI:10.1016/s0040-4039(02)01497-1
日期:2002.9
Generic approaches to the synthesis of multi-thiocarbonyl thio compounds are described. A multi-hydroxy core was condensed with either alpha-bromophenyl acetic acid or 2-mereaptopropanoic acid in the presence of p-toluenesulfonic acid catalyst to afford the corresponding esters in quantitative yield. Treatment of the bromo esters with sodium methyl trithiocarbonate or the thiols with carbon disulfide, benzyl bromide and triethylamine then affords two series of trithiocarbonates. The process is exemplified by application to mono, di- or tri-pentaerythritol. These multi-thiocarbonyl thio compounds have application as chain-transfer agents in reversible addition fragmentation chain-transfer (RAFT) polymerization as precursors to star polymers. (C) 2002 Elsevier Science Ltd. All rights reserved.
Synthesis and Self-Assembly of Amphiphilic Chiral Poly(amino acid) Star Polymers
作者:Jared Skey、Helen Willcock、Mieke Lammens、Filip Du Prez、Rachel K. O’Reilly
DOI:10.1021/ma101019g
日期:2010.7.27
Reversible addition-fragmentation chain transfer (RAFT) polymerization techniques were utilized to polymerize N-acryloyl-L-phenylalanine methyl ester (L-Phe-OMe) and tetrahydropyranyl acrylate to afford amphiphilic star polymers (with 4 and 6 arms) These copolymer stars have a chiral hydrophobic core domain and can undergo further solution self-assembly to form well-defined nanostructures, which have been characterized using DLS, TEM, and cryo-TEM analysis The characterization and properties of these novel chiral assemblies and their potential in racemic resolution are reported