1-(Bromoacetyl)pyrene,a novel photoinitiator for the copolymerization of styrene and acrylonitrile |
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Authors: | Anuradha Mishra Swati Daswal |
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Institution: | (1) Department of Chemistry, University Institute of Engineering and Technology, CSJM University, Kanpur, 208 024, India |
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Abstract: | A comparative study on photoinitiated solution copolymerization of Styrene (Sty), with acrylonitrile (AN) using pyrene, 1-acetylpyrene,
and 1-(bromoacetyl)pyrene (BrPy) as initiators, showed that the introduction of a chromophoric moiety, bromoacetyl (–COCH2Br), significantly increased the photoinitiating ability of pyrene. The kinetics and mechanism of copolymerization of Sty
with AN (Sty–co–AN) using BrPy as photoinitiator has been studied in detail. The kinetic data, inhibiting effect of benzoquinone,
and electron spin resonance (ESR) studies suggest that the polymerization proceeds via a free radical mechanism. The system
followed non-ideal kinetics (R
p
αBrPy]0.7Sty]1.09AN]1.01) and degradative solvent transfer reasonably explained these kinetic non-idealities. The co-monomer reactivity ratios calculated
by using the Finemann–Ross and Kelen–Tudos models were r
1 (Sty) = 0.39 and r
2 (AN) = 0.05. The reactivity ratios strongly indicate that the two monomers enter in almost alternating arrangement along
the copolymer chain. |
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Keywords: | Pyrene Photopolymerization Degradative transfer Sty– co– AN Non-ideal kinetics ESR |
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