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Vibrational overtone initiated photopolymerization of acrylonitrile
Author(s) -
Gu Hua,
Snavely D. L.
Publication year - 2003
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.12712
Subject(s) - acrylonitrile , monomer , overtone , polymerization , photopolymer , chemistry , photochemistry , quantum yield , bulk polymerization , absorption (acoustics) , irradiation , polymer chemistry , radical polymerization , materials science , polymer , organic chemistry , optics , fluorescence , copolymer , physics , spectral line , astronomy , nuclear physics , composite material
Abstract Vibrational overtone activated polymerization of acrylonitrile (AN) has been demonstrated using two initiators, benzoyl peroxide (BP), and 2,2′‐(azobis)isobutyronitrile (AIBN). Excitation of the fifth vibrational overtone of the CH stretch of AIBN at 627 nm and BP at 604 nm initiates the reaction. Monomer conversions were monitored by a gravimetric method. In both cases, the wavelength selectivity was investigated by irradiating the monomer/initiator mixtures at the absorption maximum of the initiator, the absorption maximum of the monomer, and at a wavelength (580 nm for AN/AIBN and 625 nm for AN/BP) where neither the initiator nor the monomer absorbs light. For the AN/AIBN mixture, after 48 h the monomer conversion for the irradiation on the peak absorption of AIBN (627 nm) is about twice as large as the irradiation at 580 nm. For the AN/BP mixture, after 48 h the monomer conversion for the irradiation on the peak absorption of BP (604 nm) is about a factor of 2.2 larger than for the irradiation at 625 nm. The overall quantum yields of both polymerizations were estimated. After 48 h the overall quantum yield for the AN/AIBN mixture irradiated at the initiator absorption (Φ 627 = 21083) is about 10 times larger than for the sample irradiated at the pure monomer absorption (Φ 595 = 1942). For the AN/BP mixture, the 604 nm quantum yield (Φ 604 = 1096) is about 2.4 times larger than the 595 nm quantum yield (Φ 595 = 448). The influence of the initiator concentration is also presented. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 565–571, 2003