Citation: . DYE-SENSITIZED PHOTOLYSIS OF o-Cl-HEXAARYLBIIMIDAZOLE AND PHOTOPOLYMERIZATION KINETICS STUDY OF THE LONG WAVE-LENGTH DYE/HEXAARYLBIIMIDAZOLE SYSTEMS*[J]. Chinese Journal of Polymer Science, ;2000, 18(6): 493-500. shu

DYE-SENSITIZED PHOTOLYSIS OF o-Cl-HEXAARYLBIIMIDAZOLE AND PHOTOPOLYMERIZATION KINETICS STUDY OF THE LONG WAVE-LENGTH DYE/HEXAARYLBIIMIDAZOLE SYSTEMS*

Received Date: 1 December 1999

o-Chloro-hexaarylbiimidazole (o-Cl-HABI) can be sensitized efficiently by the dyes 1-ethyl-3'-methyl thiacyaninebromide (C 1), 3,3'-diethyl thiacarbocyanine iodide (C 2), and cyclopentanone 2,5-bis[2-(1,3-dihydro-1,3,3-trimethyl-2H-indol-2-ylidene)ethylidene] (C 3) through electron transfer proceses. When exposed to a xenon lamp (filtered by Pyrex glass),the photosensitive systems composed of o-Cl-HABI and the above dyes can produce free radicals which initiate thepolymerization of MMA. The photopolymerization kinetics equation was obtained for the ο-C1-HABI/C2 system,Rp=K[C2]0.75[ο-C1-HABI]0.44[MTA]0.12[MMA]1.0.A comparison of the influence of different dyes on the conversion of MMA photopolymerization was conducted.
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