Reversible addition-fragmentation chain transfer graft copolymerization of styrene and m-lsopropenyl-α,α′-dimethylbenzyl isocyanate from polypropylene lanterns: Solid phases for scavenging applications

Leonie Barner, Senake Perera, Sam Sandanayake, Thomas P. Davis

Research output: Contribution to journalArticleResearchpeer-review

40 Citations (Scopus)

Abstract

The y-initiated reversible addition-fragmentation chain transfer mediated free-radical graft copolymerization of styrene and m-isopropenyl-α, α′-dimethylbenzyl isocyanate (TMI) from a polypropylene (PP) solid phase was performed with cumyl phenyldithioacetate (CPDA) as the chain-transfer agent. The initial CPDA concentration was 8 × 10-3 mol L -1. Polymerizations were performed with a dose rate of 0.18 kGy h-1 at the ambient temperature. Initial comonomer mixtures with 15, 30, and 50 mol % TMI were used. Depending on the amount of TMI in the initial comonomer mixture, the plot of the grafting ratio versus the time showed two grafting regimes (for 15 and 50 mol % TMI) or one (for 30 mol % TMI). Scavenger lanterns with 15 and 50 mol % TMI featured two isocyanate loading regimes, the second with higher loading capacities. The scavenger lanterns with 30 mol % TMI showed a linear loading capacity over the full grafting ratio. A maximum loading capacity of 110 μmol per scavenger lantern was achieved with 50 mol % TMI at a grafting ratio of approximately 60 wt %.

Original languageEnglish
Pages (from-to)857-864
Number of pages8
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Volume44
Issue number2
DOIs
Publication statusPublished - 15 Jan 2006
Externally publishedYes

Keywords

  • Graft copolymers
  • Living free-radical polymerization
  • M-isopropenyl- αα′-dimethylbenzyl isocyanate (TMI)
  • Radiation
  • Reversible addition fragmentation chain transfer (RAFT)
  • Solid phase surfaces for combinatorial chemistry

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