摘要：

Because of the easy access of a variety of UV radical A visible light initiator system for the phocoinduced cationic photointiauirn. most work has been domes only in UV source polymeriztion of epoxides is reported. It uses free radical pniosaed caboose polyma=KMno . We ressined do a visilbe lihtK prtiomosd cationlic polymerization the radical being generated from free radical initiating system. af carefully selemed. might be used a visible light absorber. The developed system consists of an successifully to extend the curing wavelepgib for epoxy ain into iodinated zanthene dye, a coinitiator and a diaryliodonium Sall the visible by a similar oxidation process. Since it is wall known Aromatic amines having low basicity and containing ta-hydrogens that halogentiaed zanthenve dyes such as Botia. Erythinsk. mid Rose ame the preferred coinitiators for fte polymnerization of cyclohextene Bengal. in combination of electron doanting coinitisins. act as oxide. T1e systemt can efficiently photounitiat the polymerization efficient visible light phiouonitiaors for free raical polymerization of certain cyclic ethers sand can functioni at any wavelength of th of acrylic monomers 7 We explored the comblaatioas of the visible spectrum depending on the dyes3 absorption stfllin aid its dyceloinitistoris and oniu in ats as povaitial visible; light iniiatimng oxidation~reduction potetiasI. systems for cationic: polymerization and report that a system Studfies on phouocherrical reactions between each two of the consisting of a disarylodoniumn salt, a N.N-dimeihtyl substituted three uopoents and characriezation of the polymer fonmed fromD aromati amine and a halogenatedl zaibnbe dye is -n efficient cyclohexenie oxide indicate that both the oxidative bleaching of die catoiarc pbosoiniuabo for certain epoxy mantma... A mcani~sm dye by the durytiodonitum salt and die reductive bleaching of the ofth imsot based on detailed explormjom of all die involved dye by the aromatic amine contribute isi a-amino radical fomtio pvoemicat processes. is proposedt. and oxidation of the a-amino radicals by diaryliodonium salts produces a-azninocarbocations which initiate the ring opening secal l tion polynmzation . Dye molecules am incorporated into the polymer in Materials. Cyclohexene oxide (Aldrich) wus dried over chain termineting processes. calcium hydride, and then purified by fiactional distillatbon under Intradvdois nitrogen. Rose Bengal. Eosin B. Erydunosi B. Rboubsnine; B. anid It i of eat nteest o intiat di canaic ingmethyleuie hime and most aromatic amine. (Aldrich) were used poyeIatisn of geatzidteest by viniblae liht bcauise rn opening without further purificattion. RBAX (sactylvatd decasboxylazed cheap. safe and poaseiess higher penerating ability toiable lighas Rsnegly TH 2357tiaoo~yrxfuri) n UV absorbing monomer and substrafts. Unfortunately, few of DIEF (2.4.diiodo*-6cthoxyfltaorooe) 0 were gifts from SOL 1 I. catiwuc initiaors or sensitized cationic initiating systems have Diphenyliodonium hexafluorophosphate diphienyliodonium been________ fon topsesphtsniivt ovsil ih o bv 5 hexafluoroarenate. diphenyliodonium hexafluooemnuuionate. Accesion For topam htsniiiytovsbelgto bv diphenyliodonium tetrafluoroborate. 4,4*-dimethyl dipheyliodoniumn tetrafluoroboiate. 4-Ineboxydipliesyl mdodain Ledwiuh 4 firs proposed the promnotion of phoboinduced terfuoooa 3,3-dinitrodiphenytiodanium atunfluaroboxate NTIS CRAM&k cationic polymeerization by ph otchemically geerwated free rdal, and triphenylsulfonium tetrafluoroborate were synthesized DTC TBBenzoin derivatives (type I initiator) and' .iWWsor l accuiig to literture procedures 12 nanC TAB~ alcho (type II initiator) were used as absorbing chromophores,. nest fSuc. helgtsuese sa40 Unanou, c._-d L! and oxidation of the formed fre radicals by dimrylodoniumn salt tugse lam equipped with 520 -i cuomif filmer to efinulmse UV Justificatior, gave cauionic species which subsequenutly, apparenty. initiated tirradiation. The emission spectrum of the filtered lamp was . ... catiotic polymierization. A typical example is

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