Polymerization photoinitiated by pyrene in the presence of triethylamine: interaction between monomers and pyrene-derived reaction intermediates

Int J of Chemical Kinetics

2007

The photopolymerization efficiency of pyrene (Py), 1-acetylpyrene (AP), and 1-(bromoacetyl)pyrene (BP) for copolymerization of n-butylacrylate (BA) with methylmethacrylate (MMA) was compared. A kinetic study of solution copolymerization in DMSO at 30 ± 0.2 • C showed that the Py could not initiate copolymerization even after 20 h, whereas with AP as initiator, less than 1% conversion was observed. However, introduction of a Br in α-methyl group of AP significantly enhanced the percent conversion. The kinetics and mechanism of copolymerization of BA with MMA using BP as photoinitiator have been studied in detail. The system follows nonideal kinetics (R p α [BP] 0.67 [BA] 1 [MMA] 0.98 ), and degradative solvent transfer reasonably explains these kinetic nonidealities. The monomer reactivity ratios (MRRs) of MMA and BA have been estimated by the Finemann-Ross and Kelen-Tudos methods, by analyzing copolymer compositions determined by 1 H-NMR spectra. The values of r 1 (MMA) and r 2 (BA) were found to be 2.17 and 0.44, respectively, which suggested the high concentration of alternating sequences in the random copolymers obtained. C 2007 Wiley Periodicals, Inc. Int

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Section: Introductionmentioning

confidence: 99%

Copolymerization of n‐butylacrylate with methylmethacrylate by a novel photoinitiator, 1‐(bromoacetyl)pyrene

Int J of Chemical Kinetics

2007

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“…Pyrene, an aromatic hydrocarbon dye, has been reported as photosensitizer/photoinitiator (Crivello and Jiang, 2002;Encinas et al, 1991). Introduction of chromophoric group (-COCH 3 ) in pyrene is expected to enhance its efficiency.…”

Section: Introductionmentioning

confidence: 99%

1-(Bromoacetyl)pyrene, a novel photoinitiator for the copolymerization of styrene and methylmethacrylate

Radiation Physics and Chemistry

2006

“…6 Pyrene, an aromatic hydrocarbon dye, has been reported as a photoinitiator in the presence of triethylamine. 1,13 Present study was undertaken with a view to see a change in the photo-initiating ability of pyrene, to polymerize methylmethacrylate (MMA), by introduction of OCOCH 3 group in the ring at first step and then replacing ␣-H by OBr. The initiation time and the extent of percent conversion of MMA by pyrene (P), 1-acetylpyrene (AP), and 1-(bromoacetyl)pyrene (BP) have been reported.…”

Section: Introductionmentioning

confidence: 99%

Methylmethacrylate polymerization photoinitiated by 1‐(bromoacetyl)pyrene

J of Applied Polymer Sci

2005