High-Performance UV-Vis Light Induces Radical Photopolymerization Using Novel 2-Aminobenzothiazole-Based Photosensitizers
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The popularity of using the photopolymerization reactions in various areas of science and technique is constantly gaining importance. Light-induced photopolymerization is the basic process for the production of various polymeric materials. The key role in the polymerization reaction is the photoinitiator. The huge demand for radical and cationic initiators results from the dynamic development of the medical sector, and the optoelectronic, paints, coatings, varnishes and adhesives industries. For this reason, we dealt with the subject of designing new, highly-efficient radical photoinitiators. This paper describes novel photoinitiating systems operating in UV-Vis light for radical polymerization of acrylates. The proposed photoinitiators are composed of squaraine (SQ) as a light absorber and various diphenyliodonium (Iod) salts as co-initiators. The kinetic parameters of radical polymerization of trimethylolpropane triacrylate (TMPTA), such as the degree of double bonds conversion (CKeywords:
TMPTA
Cationic polymerization
Trimethylolpropane
TMPTA
Bulk polymerization
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Thioxanthone
TMPTA
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Acrylate polymer
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The popularity of using the photopolymerization reactions in various areas of science and technique is constantly gaining importance. Light-induced photopolymerization is the basic process for the production of various polymeric materials. The key role in the polymerization reaction is the photoinitiator. The huge demand for radical and cationic initiators results from the dynamic development of the medical sector, and the optoelectronic, paints, coatings, varnishes and adhesives industries. For this reason, we dealt with the subject of designing new, highly-efficient radical photoinitiators. This paper describes novel photoinitiating systems operating in UV-Vis light for radical polymerization of acrylates. The proposed photoinitiators are composed of squaraine (SQ) as a light absorber and various diphenyliodonium (Iod) salts as co-initiators. The kinetic parameters of radical polymerization of trimethylolpropane triacrylate (TMPTA), such as the degree of double bonds conversion (C
TMPTA
Cationic polymerization
Trimethylolpropane
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TMPTA
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Phosphine oxide
Trimethylolpropane
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The photopolymerization of acrylonitrile initiated by AIBN was studied. The influence of monomer concentration, photoinitiator concentration, illumination time and environmental temperature on the acrylonitrile conversion and the polymer viscosity average relative molecular mass is discussed. The differences of photopolymerization systems are summarized, in which C60-(SR)n (iniferter supported with C60 ) and AIBN are respectively used as photoinitiator.
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A Silicon Macrophotoinitiator with high molecular weight,HMPP-IPDI-HOSiOH-IPDI-HMPP(HISiIH), based on 2-hydroxy-2-methylpropiophenone(HMPP),Isophone Diisocyanate(IPDI)and HOSiOH,was synthesized and characterized by FTIR.The kinetics for photopolymerization of tripropylene glycol diacrylate(TPGDA) using HISiIH as photoinitiator was studied in different stand time by Photo-DSC.The problem of oxygen for photopolymerization was resolved by HISiIH combined with photoinitiator HMPP.
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TMPTA
Bulk polymerization
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Abstract The cationic photopolymerization of trimethylolpropane tripropenyl ether (TPE), initiated by a diaryl iodonium salt, has been investigated. The influence of the presence of different alcoholic additives on the rates of photopolymerization and on the properties of the networks obtained has been studied. New 1‐propenyl ethers (trimethylolpropane dipropenyl ether (DPE) and its acetyl ester) were synthesized and employed as modifying agents in TPE photopolymerization. The thermal and dynamic‐mechanical properties of the films obtained have been investigated and are correlated with the structure of the networks and to the mechanism of the curing reaction; a microheterogeneous structure of the network was shown by dynamic‐mechanical thermal analysis. © 2001 Society of Chemical Industry
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Cationic polymerization
Propenyl
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