Rate enhancement in controlled radical polymerization of acrylates using recyclable heterogeneous lewis acid

Rong Luo, Ayusman Sen

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

The rate enhancement in nitroxide-mediated polymerization (NMP) and reversible addition-fragmentation transfer (RAFT) polymerizations in the presence of catalytic amount of solid acidic alumina as Lewis acid was investigated. The Lewis acid coordinated the ester carbonyl group of the acrylate monomer and reduces the electron density in the conjugated carbon-carbon double bond thereby increasing the reactivity of the radical generated. A significant deviation from linearity was observed at longer reaction times and the polydispersity (PDI) of the resultant polymers was high. The sample of alumina was used for successive n-butyl acrylate homopolymerizations. It was observed that the polymerization rate increased with increasing amount of added alumina. It was also observed that the addition of insoluble acidic alumina to controlled radical NMP and RAFT polymerizations of acrylate monomers results in significantly higher reaction rates and conversions.

Original languageEnglish (US)
Pages (from-to)154-156
Number of pages3
JournalMacromolecules
Volume40
Issue number2
DOIs
StatePublished - Jan 23 2007

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Acrylates
Lewis Acids
Free radical polymerization
Aluminum Oxide
Polymerization
Alumina
Acids
Carbon
Monomers
Polydispersity
Homopolymerization
Reaction rates
Carrier concentration
Esters
Polymers

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

Cite this

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abstract = "The rate enhancement in nitroxide-mediated polymerization (NMP) and reversible addition-fragmentation transfer (RAFT) polymerizations in the presence of catalytic amount of solid acidic alumina as Lewis acid was investigated. The Lewis acid coordinated the ester carbonyl group of the acrylate monomer and reduces the electron density in the conjugated carbon-carbon double bond thereby increasing the reactivity of the radical generated. A significant deviation from linearity was observed at longer reaction times and the polydispersity (PDI) of the resultant polymers was high. The sample of alumina was used for successive n-butyl acrylate homopolymerizations. It was observed that the polymerization rate increased with increasing amount of added alumina. It was also observed that the addition of insoluble acidic alumina to controlled radical NMP and RAFT polymerizations of acrylate monomers results in significantly higher reaction rates and conversions.",
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Rate enhancement in controlled radical polymerization of acrylates using recyclable heterogeneous lewis acid. / Luo, Rong; Sen, Ayusman.

In: Macromolecules, Vol. 40, No. 2, 23.01.2007, p. 154-156.

Research output: Contribution to journalArticle

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AB - The rate enhancement in nitroxide-mediated polymerization (NMP) and reversible addition-fragmentation transfer (RAFT) polymerizations in the presence of catalytic amount of solid acidic alumina as Lewis acid was investigated. The Lewis acid coordinated the ester carbonyl group of the acrylate monomer and reduces the electron density in the conjugated carbon-carbon double bond thereby increasing the reactivity of the radical generated. A significant deviation from linearity was observed at longer reaction times and the polydispersity (PDI) of the resultant polymers was high. The sample of alumina was used for successive n-butyl acrylate homopolymerizations. It was observed that the polymerization rate increased with increasing amount of added alumina. It was also observed that the addition of insoluble acidic alumina to controlled radical NMP and RAFT polymerizations of acrylate monomers results in significantly higher reaction rates and conversions.

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