Propagation and size-dependent chain termination rate parameters in the polymerization of acrylates in aqueous solution as studied by pulse radiolysis

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Abstract

The radiation polymerizations of ethyl acrylate (EA) and hydroxyethyl acrylate (HEA) monomers in aqueous solutions were studied. For pulse radiolytic experiments, optical detection was used to measure the concentration of intermediates. The absorption spectra taken after a 2.6-μs pulse in N2O-saturated acidic solution of EA and HEA are shown to have maxima at 300 nm. It was proved by comparative measurements that these maxima belong to α-carboxy alkyl radicals. At a low acrylate concentration (below 1 mmol·dm-3) and a relatively high dose/pulse value (above 30 yY), the decay of the transient signal occurs close to second-order kinetics. Average values of the termination rate parameters were calculated from aftereffect measurements. A computer program based on numerical integration was applied in order to estimate the individual rate parameters.

Original languageEnglish
Pages (from-to)443-454
Number of pages12
JournalJournal of Macromolecular Science - Pure and Applied Chemistry
VolumeA32
Issue number3
Publication statusPublished - Mar 1995

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Acrylates
Radiolysis
Polymerization
Computer program listings
Absorption spectra
Monomers
Radiation
Kinetics
Experiments
acrylic acid
ethyl acrylate

ASJC Scopus subject areas

  • Materials Chemistry
  • Polymers and Plastics

Cite this

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abstract = "The radiation polymerizations of ethyl acrylate (EA) and hydroxyethyl acrylate (HEA) monomers in aqueous solutions were studied. For pulse radiolytic experiments, optical detection was used to measure the concentration of intermediates. The absorption spectra taken after a 2.6-μs pulse in N2O-saturated acidic solution of EA and HEA are shown to have maxima at 300 nm. It was proved by comparative measurements that these maxima belong to α-carboxy alkyl radicals. At a low acrylate concentration (below 1 mmol·dm-3) and a relatively high dose/pulse value (above 30 yY), the decay of the transient signal occurs close to second-order kinetics. Average values of the termination rate parameters were calculated from aftereffect measurements. A computer program based on numerical integration was applied in order to estimate the individual rate parameters.",
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T1 - Propagation and size-dependent chain termination rate parameters in the polymerization of acrylates in aqueous solution as studied by pulse radiolysis

AU - Wojnárovits, L.

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AU - Biro, A.

PY - 1995/3

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N2 - The radiation polymerizations of ethyl acrylate (EA) and hydroxyethyl acrylate (HEA) monomers in aqueous solutions were studied. For pulse radiolytic experiments, optical detection was used to measure the concentration of intermediates. The absorption spectra taken after a 2.6-μs pulse in N2O-saturated acidic solution of EA and HEA are shown to have maxima at 300 nm. It was proved by comparative measurements that these maxima belong to α-carboxy alkyl radicals. At a low acrylate concentration (below 1 mmol·dm-3) and a relatively high dose/pulse value (above 30 yY), the decay of the transient signal occurs close to second-order kinetics. Average values of the termination rate parameters were calculated from aftereffect measurements. A computer program based on numerical integration was applied in order to estimate the individual rate parameters.

AB - The radiation polymerizations of ethyl acrylate (EA) and hydroxyethyl acrylate (HEA) monomers in aqueous solutions were studied. For pulse radiolytic experiments, optical detection was used to measure the concentration of intermediates. The absorption spectra taken after a 2.6-μs pulse in N2O-saturated acidic solution of EA and HEA are shown to have maxima at 300 nm. It was proved by comparative measurements that these maxima belong to α-carboxy alkyl radicals. At a low acrylate concentration (below 1 mmol·dm-3) and a relatively high dose/pulse value (above 30 yY), the decay of the transient signal occurs close to second-order kinetics. Average values of the termination rate parameters were calculated from aftereffect measurements. A computer program based on numerical integration was applied in order to estimate the individual rate parameters.

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