二芳基碘Weng盐光引发体系研究进展

对二芳基碘Ｗｅｎｇ盐光引发剂以及由它组成的光敏引发体系做了较为详细的介绍。     

二芳基碘鎓盐光引发体系研究进展

对二芳基碘鎓盐光引发剂以及由它组成的光敏引发体系做了较为详细的介绍     

双光子光聚合技术及其研究进展

本文对双光子光聚合技术进行了比较全面系统的综述,主要介绍了双光子光聚合的基本原理,国内外双光子光聚合光敏引发体系和具有大的双光子吸收截面有机分子的研究现状以及双光子光聚合技术的潜在应用领域.     

以二甲基硅二苯基硅共聚物引发苯乙烯光聚合的研究

本文研究了二甲基硅二苯基硅共聚物(P(DMS-co-DPS))作为光敏引发剂,引发苯乙烯进行光聚合的过程。结果表明,聚合为自由基引发的链式反应,聚合速率与P(DMS-co-DPS)浓度的0.37次方成正比;本体聚合活化能为30.6KJ/mol,氧气对聚合无明显影响。     

光氧化还原碘Wong盐引发阳离子固化的研究

合成了二苯基碘Ｗｏｎｇ六氟磷酸盐光引发剂。研究了染料的种类和学地磺Ｗｏｎｇ盐引发阳离子光固化速度的影响，用光致电子转移理论解释了这些光敏染料的光敏机理。     

新型感可见光的光引发体系乙基曙红碘Weng盐的研究

合成并研究了新型感可见光的光引发体系乙基曙红碘Ｗｅｎｇ盐，结果表明，该引发剂的物理化学性质和光敏引发效率受其结构，介质性质和浓度等诸多因素影响。在可见光照射下，发生由乙基曙红阴离子向二苯基碘Ｗｅｎｇ阳离子的电子转移反应，产且具有引发活性的苯自由基和非活性的乙基曙红自由基。     

一种新型香豆素酮可见光敏化染料的合成及其光引发性质的研究

高效的可见光光敏引发体系是目前光聚合研究中的重要领域.3,3′-二(7-二乙胺基)香豆素酮(R)已被公认为一种高效的可见光聚合敏化染料,并可以与Ar⁺激光488 nm波长匹配.本文新合成了一种染料3-(4-二乙胺基-苯丙烯酰基)-7-二乙胺基香豆素(S).实验发现在普通碘钨灯照射下,S/邻氯六芳基双咪唑(HABI)体系具有比已有高效染料R/HABI体系更快的光漂白速度和更高的引发聚合效率,是一种新型高效的可见光光敏聚合引发体系.而且S在不同溶剂中的最大吸收波长在452～489 nm之间,比R红移16～30 nm,因此该体系可以更好地与Ar⁺ (488 nm)激光器匹配.本文对该染料的光敏化机理进行了探讨.     

环氧有机硅阳离子型光敏预聚物的合成及其光敏性能的研究

合成了环氧有机硅光敏预聚物及阳离子光引发剂甲苯茂铁四氟硼酸盐 ,研究光引发剂种类、预聚物与单体配比、增感剂结构等因素对固化速度的影响 ,发现预聚物体系的感度较高 ,最小感度值为 1 65mJ/cm² ;并讨论了甲苯茂铁四氟硼酸盐的暗聚合能力     

环缩醛化合物在光聚合体系中的研究进展

环缩醛化合物作为一类具有光敏性的化合物,虽然在上世纪60年代有较多的研究,但由于其吸收波长较窄、引发效率较低等限制,后期研究比较少.但最近5年内,由于对胡椒环等环缩醛化合物的重新认识,尤其是将其作为光聚合引发助剂来提高引发效率或减少引发体系的毒性,获得了光聚合生物材料领域的特别关注.本文对环缩醛类化合物的光聚合行为进行了系统阐述,对当前环缩醛类化合物用作光引发剂及助引发剂的进展也进行了详细介绍.     

新型感可见光的染料鎓盐光引发体系

 本文报道了一种新型感可见光的引发体系-曙红双(二苯基碘鎓盐)(Eo(IPh₂)₂).在基态,这种体系具有良好的热稳定性,而在激发态时能发生离子对内光诱导电子转移反应,导致其发生漂白和碘鎓盐的分解反应,产生具有引发作用的自由基.该体系适用于一般烯类单体的自由基聚合,其中时丙烯酸酯类单体效果最好.在以甲基丙烯酯甲酯(MMA)为单体时,聚合反应速度满足动力学方程:R_p=l[Eo(IPh₂)₂]^0.38[MMA],并求得聚合反应的活化能E_c=7.00kcal/mol.氧在Eo(IPh₂)₂光敏引发聚合中,既起自由基聚合阻聚剂的作用,又起引发剂三重态猝灭剂作用     

大分子光引发剂的研究进展

综述了大分子光引发剂的研究现状和进展。简要叙述了大分子光引发剂的制备方法、引发机理。对小分子光引发剂和大分子光引发剂进行了对比,着重讨论了分子结构因素对引发性能的影响。     

阳离子光引发剂敏化的研究进展

常用的阳离子光引发剂吸收波长在250-300 nm,与紫外光固化设备的辐射波长不匹配,光引发速率和效率低.本文介绍了阳离子光引发剂的种类、特点以及使引发剂体系吸收红移的研究,着重总结了阳离子光引发剂的敏化理论和技术.概述的敏化机理包括:能量转移、自由基氧化、激发态复合物和碎片加成.常用敏化方法有:添加光敏剂、扩大分子共轭使吸收红移和键合生色基团.文章还对新型阳离子光引发剂和光敏剂的设计和应用给予了展望.     

Synthesis and photoactivity of novel 5‐arylthianthrenium salt cationic photoinitiators

5‐Arylthianthrenium salts are a class of efficient triarylsulfonium salt photoinitiators for cationic polymerization. These compounds were prepared by a simple, straightforward, versatile, and high yield route. The new photoinitiators were characterized by standard analytical and spectroscopic techniques, and their activity as cationic photoinitiators was compared with related triarylsulfonium salts of similar structures using Fourier transform real‐time infrared spectroscopy. Through the use of electron‐transfer photosensitizers, the response of these photoinitiators can be readily spectrally broadened into the long‐wavelength UV–visible regions of the spectrum. The results obtained suggest that 5‐arylthianthrenium salts are potential replacements for now available triarysulfonium salt photoinitiators in many applications. © 2002 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 40: 3465–3480, 2002     

Photoreactive UV-crosslinkable acrylic pressure-sensitive adhesives containing type-II photoinitiators

UV-crosslinking is an established technology used in many industrial manufacturing processes. New applications and technical specifications of UV technologies stimulate the continuous development of photoinitiators that can efficiently meet specific requirements. A typical class of radical-reactive type-II photoinitiators has been used for the UV-initiated crosslinking of acrylic pressure-sensitive adhesives (PSAs).The activity of type-II photoinitiators such as: benzophenone derivatives, thioxanthone derivative, antraquinone derivative and fluorenone (without tertiary amine as a co-initiator) in the photoreactive UV-crosslinkable acrylic pressure-sensitive adhesives was described. The effect of the type-II photoinitiators on the acrylic PSA properties (tack, peel, and shear strength) was summarized.     

Photopolymerization of hybrid monomers: Part I: Comparison of the performance of selected photoinitiators in cationic and free-radical polymerization of hybrid monomers

Photopolymerization of the hybrid monomers: 3,4-epoxycyclohexylmethyl methacrylate (Cyclomer M100) and 2-(2-vinyloxyethoxy)ethyl acrylate (VEEA) was studied by Fluorescence Probe Technique (FPT). Kinetics of cationic and free-radical photopolymerization of the hybrid monomers in the presence of the same molar concentration of various photoinitiators was compared, using UV LEDs as the curing light source. The performance of the following photoinitiators was tested in the cationic photopolymerization: Sylanto 7M-S, Sylanto 7M-P, Speedcure 938, Irgacure 250, HIP, Esacure 1187, and the following photoinitiators were used to induce free radical photopolymerization: Irgacure 184, Irgacure 127, Irgacure 651, Irgacure 907, Irgacure 819 and Speedcure TPO. It was found that, among the cationic photoinitiators, Sylanto 7M-S and Sylanto 7M-P are the most effective photoinitiators of the cationic polymerization for use with 320 nm and 365 nm UV LEDs, while Irgacure 819 and Speedcure TPO perform best in free radical photopolymerization of the hybrid monomers. Some structural factors and parameters affecting the photoinitiators performance are discussed.     

水溶性光聚合引发剂研究进展

近几年发展起来的水溶性光聚合引发剂（ＷＳＰ）属自由基引发剂，按结构可分为芳酮类，稠环类烃类，聚硅烷类，酰基膦酸盐等，偶氮类及金属有机配合物类，本文综述了这些光引发剂的结构特性，光化学行为，光引发效率及光反应机理等。     

New "one-step" method for the simultaneous synthesis and anchoring of organic monolith inside COC microchip channels

A new method for monolith synthesis and anchoring inside cyclic olefin copolymer (COC) microchannels in a single step is proposed. It is shown that type I photoinitiators, typically used in a polymerization mixture to generate free radicals during monolith synthesis, can simultaneously act as type II photoinitiators and react with the plastic surface through hydrogen abstraction. This mechanism is used to "photograft" poly(ethylene glycol) methacrylate (PEGMA) on COC surfaces. Contact angle measurements were used to observe the changes in surface hydrophilicity when increasing initiator concentration and irradiation duration. The ability of type I photoinitiators to synthesize and anchor a monolith inside COC microchannels in a single step was proved through SEM observations. Different concentrations of photoinitiators were tried. Finally, electrochromatographic separations of polycyclic aromatic hydrocarbons were realized to illustrate the beneficial effect of anchoring on chromatographic performances. The versatility of the method was demonstrated with two widely used photoinitiators: benzoin methyl ether (BME) and azobisisobutyronitrile (AIBN).     

含二苯甲酮基的有机硅光引发体系

在UV照射下,用含巯基的有机硅化合物与聚甲基乙烯基硅氧烷加成硫化虽有专利报道,但该反应体系是以二苯甲酮类化合物作为光敏剂。当我们进行这方面研究时,发现二苯甲酮与有机硅氧烷预聚物相容性差,从而影响光加成反应的速度。为了改善光敏剂与有机硅预聚物的相容性,本文合成了具二苯甲酮基团的环状有机硅氧烷及其高聚物作为光敏剂。     

Hyperbranched poly(ether amine)(hPEA)as novel backbone for amphiphilic one-component type-Ⅱ polymeric photoinitiators

A series of amphiphilic polymeric photoinitiators with hyperbranched poly(ether amine) (hPEA) as novel backbone were developed, which can initiate photopolymerization of water-soluble and hydrophobic monomers very efficiency and might have great potential applications in the field of photo-curing.     

Photoinduced and thermally induced cationic polymerizations using S,S‐dialkyl‐S‐(3,5‐dimethylhydroxyphenyl)sulfonium salts

A study of the photoinitiated and thermally initiated cationic polymerizations of several monomer systems with S,S‐dialkyl‐S‐(3,5‐dimethylhydroxyphenyl)sulfonium salt (HPS) photoinitiators bearing different lengths of alkyl chains on the positively charged sulfur atom has been conducted. HPS photoinitiators are capable of photoinitiating the cationic polymerization of a wide variety of epoxy and vinyl ether monomers directly on irradiation with short‐wavelength UV light. Aryl ketone photosensitizers are effective in extending the spectral response of these photoinitiators into the long‐wavelength UV region. Kinetic studies with real‐time infrared spectroscopy show that HPS photoinitiators exhibit good efficiency in the polymerization of epoxide and vinyl ether monomers. Comparative studies also demonstrate that S,S‐dimethyl‐S‐(3,5‐dimethyl‐2‐hydroxyphenyl)sulfonium salts are more active photoinitiators than their isomeric S,S‐dimethyl‐S‐(3,5‐dimethyl‐4‐hydroxyphenyl)sulfonium salt counterparts. Both types of HPS photoinitiators display reversible photolysis as a result of facile termination reactions that take place between the growing chains ends with the photogenerated sulfur ylides. Preliminary studies have shown that HPS photoinitiators can also be employed as thermal initiators for the cationic ring‐opening polymerization of epoxides at moderate temperatures. © 2003 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 41: 2570–2587, 2003