Site Transformation of Polyisobutylene Chain Ends into Functional RAFT Agents for Block Copolymer Synthesis
Document Type
Article
Publication Date
4-1-2009
Department
Polymers and High Performance Materials
Abstract
Block copolymers consisting of polyisobutylene (PLB) and either poly(methyl methacrylate) (PMMA) or polystyrene (PS) block segments were synthesized by a site transformation approach combining living cationic and reversible addition-fragmentation transfer (RAFT) polymerizations. The initial PIB block was synthesized via quasi-living cationic polymerization using the TMPCl/TiCl(4) initiation system and Subsequently converted into a hydroxyl-terminated PIB. Site transformation of the hydroxyl-terminated PIB into a macro-chain-transfer agent (PIB-CTA) was accomplished by N,N'-dicyclohexylcarbodiimide/dimethylaminopyridine-catalyzed esterification with 4-cyano-4-(dodecylsulfanylthiocarbonylsulfanyl) pentanoic acid. Structure of the PIB-CTA was confirmed by both (1)H and (13)C NMR spectroscopy. The PIB-CTA was then employed in a RAFT polymerization of either methyl methacrylate or styrene, resulting in PIB block copolymers with narrow polydispersity index and predetermined molecular weights confirmed by both (1)H NMR and GPC.
Publication Title
Macromolecules
Volume
42
Issue
7
First Page
2353
Last Page
2359
Recommended Citation
Magenau, A. J.,
Martinez-Castro, N.,
Storey, R. F.
(2009). Site Transformation of Polyisobutylene Chain Ends into Functional RAFT Agents for Block Copolymer Synthesis. Macromolecules, 42(7), 2353-2359.
Available at: https://aquila.usm.edu/fac_pubs/1335