Reversible addition–fragmentation chain-transfer graft polymerization of styrene: Solid phases for organic and peptide synthesis
Barner, Leonie, Zwaneveld, Nik, Perera, Senake, Pham, Yen, & Davis, Thomas P. (2002) Reversible addition–fragmentation chain-transfer graft polymerization of styrene: Solid phases for organic and peptide synthesis. Journal of Polymer Science Part A: Polymer Chemistry, 40(23), pp. 4180-4192.
The gamma-initiated reversible addition-fragmentation chain-transfer (RAFT)agent-mediated free-radical graft polymerization of styrene onto a polypropylene solid phase has been performed with cumyl phenyldithioacetate (CPDA). The initial CPDA concentrations range between 1 x 10(-2) and 2 x 10(-3) mol L-1 with dose rates of 0.18, 0.08, 0.07, 0.05, and 0.03 kGy h(-1). The RAFT graft polymerization is compared with the conventional free-radical graft polymerization of styrene onto polypropylene. Both processes show two distinct regimes of grafting: (1) the grafting layer regime, in which the surface is not yet totally covered with polymer chains, and (2) a regime in which a second polymer layer is formed. Here, we hypothesize that the surface is totally covered with polymer chains and that new polymer chains are started by polystyrene radicals from already grafted chains. The grafting ratio of the RAFT-agent-mediated process is controlled via the initial CPDA concentration. The molecular weight of the polystyrene from the solution (PSfree) shows a linear behavior with conversion and has a low polydispersity index. Furthermore, the loading of the grafted solid phase shows a linear relationship with the molecular weight of PSfree for both regimes. Regime 2 has a higher loading capacity per molecular weight than regime 1. (C) 2002 Wiley Periodicals, Inc.
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|Item Type:||Journal Article|
|Keywords:||living polymerization; radiation; reversible addition-fragmentation chain transfer (RAFT); graft copolymers; solid phase surfaces for combinatorial chemistry|
|Divisions:||Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > Institutes > Institute for Future Environments
Current > QUT Faculties and Divisions > Science & Engineering Faculty
|Copyright Owner:||Copyright 2002 Wiley Periodicals, Inc.|
|Deposited On:||28 Jul 2016 22:15|
|Last Modified:||28 Jul 2016 22:15|
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