双极型均二苯乙烯发光材料的合成和光电特性

已发现三苯胺基和苯并(噁)唑是优良的有机共轭发光材料电荷传输基团.将三苯胺基作为空穴传输基团和苯并(噁)唑作为电子传输基团引入均二苯乙烯分子中,设计并合成了四个新双极小分子发光物质4-二苯氨基-4‘-(2-苯并(噁)唑)均二苯乙烯.通过光谱分析和元素分析等方法确认了其化学结构.所合成化合物的相关分析结果表明化学结构、取代基效应、溶剂环境等因素对其UV-Vis光谱、荧光光谱、荧光量子产率、电致发光谱和启亮电压都产生一定的影响.     

金属包装用气相防锈纸缓蚀性能研究

目的研究基于苯并三氮唑(BTA)复配气相缓蚀剂涂布制成的气相防锈纸的缓蚀性能。方法以苯并三氮唑作为主缓蚀剂,采用正交试验与碘化钾、钨酸钠、乌洛托品、尿素进行复配,研究分析气相防锈纸在氯化钠溶液条件下对碳钢和10号钢的缓蚀性能。结果当苯并三氮唑、碘化钾、钨酸钠、乌洛托品、尿素的质量份配比为12∶12∶8∶12∶25时,对碳钢的缓蚀效率达到91.07%;当苯并三氮唑、碘化钾、钨酸钠、乌洛托品、尿素的质量份配比为12∶20∶8∶16∶25时,对10号钢的缓蚀效率达到90.17%。结论基于苯并三氮唑复配高效气相缓蚀剂涂布制备的气相防锈纸不仅绿色环保、安全无毒,而且缓蚀效率高于市售气相防锈纸,具有优良的防锈性能。     

6-硝基苯并咪唑与苯并三氮唑的显影抑制机理

引言补加至乳剂及显影剂的苯并三氮唑(BTZ)对显影的抑制作用过去曾研究过。苯并三氮唑,在显影剂溶解力较低的情况下,对于以氯溴化银为主的乳剂乃是一种有效的显影抑制剂,但对各种化学增感之溴碘化银乳剂却并没有显影抑制作用。这     

保护后的铜镀层的耐蚀性表征

为了快捷方便地表征铜镀层的保护膜的耐蚀性,采用中性盐雾试验、Tafel极化曲线和交流阻抗法表征3种典型的保护剂(BCu-10、苯并三氮唑乙醇溶液、2-巯基苯并咪唑乙醇溶液)保护后的铜镀层的耐蚀性,对3种表征结果进行比较.结果表明:3种表征结果一致,3种保护剂的保护效果从优到差依次为 BCu-10、苯并三氮唑乙醇溶液、2...     

铜和铜合金的缓蚀剂

本文是关于铜和铜合金缓蚀剂的最近的文献综述。缓蚀剂分成两大类:①无机缓蚀剂如铬酸、磷酸和铁离子,②有机缓蚀剂它们包括杂环化合物,也就是苯并三氮唑(BTA)和巯基苯并噻唑(MBT)和它的有关化合物。目前在各种系统中这些是最有效的、最广泛使用的缓蚀剂。BTA的衍生物例如甲苯并三氮唑(TFA)和苯并唑羧酸对于铜和铜合金是最好的缓蚀剂。有人提议二巯基噻二唑(DMTDA)和三嗪二疏醇(TDT)及其衍生物可以作为BTA的代用品。在有些腐蚀环境中,DMTDA和TDT的效率均比BTA好得多。长链硫化合物作为成膜缓蚀剂也作了介绍。     

液体紫外线吸收剂在照相材料中的应用

1.前言长期以来,人们普遍使用固体紫外线吸收剂,如取代苯基苯并三氮唑类化合物和羟基苯基苯并三氮唑类化合物等,来防止卤化银照相材料受紫外光或静电光感光。由于固体紫外线吸收剂不溶于水,使用时必须先用高沸点有机溶剂(如对苯二甲酸二丁酯、对苯二甲酸二辛酯、磷酸三甲酚酯和月桂酰胺等)和助溶剂(如乙酸乙酯等)将其溶解,分散到明胶液中之后才能加到涂布液中,使用不便,缺点甚多,因此八十年代以来逐步趋于     

用化学显微镜法研究稳定剂和防灰雾剂在氯化银微晶上的作用机理

采用双注乳化工艺制备了AgCl微晶，用扫描电镜（SEM）和原子力显微镜（AFM）对其形貌进行了观察。运用“化学显微镜”法研究了四氮茚、巯基唑类和苯并三氮唑等系列稳定剂和防灰雾剂在AgCl微晶上的作用机理。结果表明，1-苯基-5-巯基四氮唑等巯基唑类化合物在AgCl微晶感光中心上有较强的吸附性，4-羟基-6-甲基-1，3，3，7α-四氮茚及其衍生物在感光中心上的吸附性相对较弱，苯并三氮唑和6-硝基苯并眯唑等在感光中心上不吸附。     

光促NABT-CBr_4催化MMA聚合反应

合成了N-烯丙基苯并三氮唑(NABT)。研究了光照、光强、温度对NABT-CBr_4催化MMA聚合反应的影响,讨论了催化剂配比、用量对MMA及不同单体的催化活性、产率和分子量的影响。     

一种新型膨胀型阻燃剂合成及阻燃性能研究

采用新戊二醇、三氯氧磷为原料,在超声场中合成了新戊二醇磷酰氯,采用超声波技术提高产品的产率。再将新戊二醇磷酰氯与苯并三氮唑反应生成一种新型膨胀型阻燃剂3-(5,5-二甲基-1,3-二氧杂-2-磷杂环己基磷酰基)苯并三氮唑,通过对制得的产品结构进行了表征,测定了该阻燃剂的膨胀度,膨胀度ID为49.8cm~3/g。将阻燃剂应用于制备阻燃性聚丙烯,通过氧指数法考察了阻燃性聚丙烯的阻燃性能,氧指数(LOI)值为27.1。     

表面改性处理对银包铜导电涂层的性能影响

针对银包铜涂层耐腐蚀性能差的特点，对银包铜粉进行表面改性处理并制备导电涂层，以提高其耐蚀性能。采用化学镀制备银包铜粉，分别用硬脂酸、苯并三氮唑和十七氟癸基三甲氧基硅烷进行表面改性处理。将不同表面改性处理后的银包铜粉作为导电填料，改性丙烯酸树脂为基体，制备出耐腐蚀的银包铜粉导电浆料。将其涂覆在聚酯(PET)薄膜上，采用低温固化工艺，得到耐腐蚀的银包铜涂层。利用X射线衍射(XRD)、扫描电镜(SEM)、EDS能谱、直流低电阻仪、接触角测试仪分析涂层的成分、形貌、导电性、表面润湿状况，以及用电化学工作站和盐雾浸泡实验分析其耐腐蚀能力。结果表明：用硬脂酸处理的银包铜粉制得的涂层接触角最大，为140°;电阻率为1.06×10^-3Ω·cm。采用苯并三氮唑改性处理的银包铜粉制备的涂层在中性盐雾腐蚀后仍具有良好的导电性，同时在电化学测试中腐蚀电位最正，显示了良好的耐腐蚀性能。     

双甲基丙烯酸聚乙二醇酯的合成及光聚合反应

合成了一系列新型的具有光引发聚合反应活性的单体；不同分子量的聚乙二醇的双甲基丙烯酸酯。单体在紫外光引发条件下进行自由基聚合，生成交联的聚合产物。用＾１Ｈ－ＮＭＲ对单体进行了表征。用ＩＲ对单体和聚合物进行了分析，研究了双甲基丙烯酸二乙二醇酯的聚合反应动力学，测定了聚合活化能。     

Supramolecular Nanotube Reactors for Production of Imine Polymers with Controlled Conformation,Size, and Chirality

A series of supramolecular nanotubes with inner diameters of 1, 4, 9, 12, 16, and 29 nm are prepared from amino acid lipids. The hydrophobic channels of the nanotubes act as reactors for the formation of imine polymers by not only effectively encapsulating the benzaldehyde and diacetyleneamine precursors of the imine monomers but also markedly accelerating imine formation. The nanotube inner diameter determines whether the imine monomers self‐assemble into nanoparticles, nanotapes, nanocoils, or twisted nanofibers in the channels. UV‐induced polymerization of the diacetylene units in the imine nanostructures followed by decomposition of the nanotubes into molecular dispersions of the constituent amino acid lipids results in expulsion of the polymerized imine nanostructures with retained conformation. The isolated nanocoils and twisted nanofibers retain the helicity and circular dichroism induced by the nanotubes, which exhibits supramolecular chirality, even though the components of the imine monomers are achiral. These supramolecular nanotubes with tunable diameters and functionalizable surfaces can be expected to be useful for the production of polymers with controlled conformation, size, and chirality without the need for rational design or chemical modification of the monomers or optimization of the polymerization conditions.     

Method for synthesis and screening of large groups of molecularly imprinted polymers

A technique for the synthesis of molecularly imprinted polymers (MIPs) in small scale (～55 mg) coupled with direct in situ processing and batch rebinding evaluation is reported. The primary assessment is based on quantification by HPLC or UV absorbance measurement of the amount of template released from the polymer in a given solvent. This method allows a rapid screening of the parameters of importance to reach a desired level of binding affinity capacity and selectivity for a given target molecule. This was demonstrated for the triazine herbicide terbutylazine, where an initial screening was performed for the type of functional monomer used in the MIP preparation. Thus among the six functional monomers tested, methyl methacrylate, 4-vinylpyridine, and N-vinyl-α-pyrrolidone led to rapid and quantitative extraction whereas methacrylic acid and (trifluoromethyl)acrylic acid led to polymers that retained the template the most. After having established useful functional monomers, a secondary screening for selectivity was performed. In this, nonimprinted blank polymers were prepared and a normal batch rebinding evaluation was performed. The polymer showing the highest selectivity was the one prepared using methacrylic acid as functional monomer. This polymer was shown to strongly retain chlorotriazines including atrazine when a normal-scale batch of the polymer was evaluated in chromatography.     

Reactions of polymers in supercritical fluids for chemical recycling of waste plastics

Sub- or supercritical fluids have been focused as reaction media for environmental applications from a view point of green chemistry. Chemical recycling of waste plastics is important issue. We have applied reaction in water or organic solvent in sub- or supercritical condition to convert polymers into its monomers. Condensed polymers such as polyethylene terephthalate or nylon 6 were depolymerized to its monomers by hydrolysis of alcoholysis in supercritical water or alcohol. The other polymers such as phenol resin and fiber reinforced plastics (FRP) were also decomposed to small molecules by solvolysis. In this paper, the degradation of polymers studied in our group was reviewed.     

Migration of Acrylic Monomers from Methacrylate Polymers – Establishing Parameters for Migration Modelling

Acrylic acid‐based and methacrylic acid‐based monomers are widely used for the manufacture of polymers, for polymer dispersions or for other specialty resins. Some of these applications cause interactions between the polymer and contact medium such as food contact materials, eyeglasses, contact lenses or toys. More specifically, migration of monomers from the polymer into the contact medium may occur, which needs to be evaluated for safety purposes. The objective of this study was to investigate the basic diffusion properties of acrylic polymers with respect to representative monomers in order to establish a scientific basis for migration modelling simulating the mass transport of monomers from the polymers when they are in contact with foods, human skin or body fluids such as sweat and saliva. For this purpose, 11 representative acrylic polymers containing five different acrylic monomers (MA, EA, BA, MMA and nBMA) were studied in extensive kinetic migrations experiments in contact with five different contact media (simulants) at three different temperatures (20°C, 40°C and 60°C). The simulants were selected according to the applications: toys were simulated by saliva simulant and articles coming in contact with human skin by sweat simulant. For food contact applications, water (aqueous foods), Miglyol 840 (Sasol, Witten, Germany) (fatty food) and Tenax® (Sigma‐Aldrich Corporation, Munich, Germany) (an adsorbent simulating dry foods) were selected. The diffusion coefficients (D) of the monomers in the polymer as well as partition coefficients between polymer and contact media were derived. It was found that those acrylic polymer materials used for rigid plastics applications exhibit extremely low diffusion behaviour, whereas acrylic polymer resins used for coating applications showed somewhat higher diffusion behaviour but this still at very low rates in comparison with other typical polymers used for the manufacture of food packaging materials. As a result, conservative polymer‐specific constants in support of migration modelling were established, and the specifications for the model general applicability were determined and specified. The parameter related to the polymers' intrinsic mobility is applicable to model migration of any other organic chemical substances, which may be present in acrylic polymers as potential migrants when they have comparable or higher molecular weights than the studied monomers. Copyright © 2012 John Wiley & Sons, Ltd.     

Synthesis and Application of Hethacrylate Polyhers in the Forhulation of Hatrix Tablets

Polymers were prepared by using two types of methacrylate monomers viz. hydrophobic monomers (methymethacrylate, butylmethacrylate) and hydrophilic monomers (2-hydroxy ethyl methacrylate, 2-hydroxy propyl methacrylate) using solution polymerisation method. Characterisation of the physico-chemical properties of the polymers was studied. The polymers were then evaluated as matrix formers for drugs selected on the basis of their aqueous solubility.     

Synthesis and polymerization of substituted ammonium sulfonate monomers for advanced materials applications

Sulfonated polymers have found use as ion-exchange membranes for use in fuel cells, water purification, electroactive devices, and inorganic materials templating and synthesis. Improving the materials for these applications and opening up new applications requires the ability to synthesis targeted or more complex sulfonated polymers, which includes tailoring the chemistry (copolymerization across a wider range of solubility) and/or polymer architecture (block, graft, nanoparticle). This article will summarize the recent work using sulfonated monomers with substituted ammonium counterions as a versatile route for enabling this goal. Two main benefits of these monomers are as follows. First, they are useful for preparing amphiphilic copolymers, which is a challenge using traditional acidic or alkali salt forms of sulfonated monomers. Second, sulfonated polymers with substituted ammonium counterions are useful polymers for obtaining unique material properties, such as organo-gelation of low polarity solvents or obtaining ionic liquid polymers for the fabrication of solid polymer electrolytes.     

Synthesis and Application of Hethacrylate Polyhers in the Forhulation of Hatrix Tablets

Abstract

Polymers were prepared by using two types of methacrylate monomers viz. hydrophobic monomers (methymethacrylate, butylmethacrylate) and hydrophilic monomers (2-hydroxy ethyl methacrylate, 2-hydroxy propyl methacrylate) using solution polymerisation method. Characterisation of the physico-chemical properties of the polymers was studied. The polymers were then evaluated as matrix formers for drugs selected on the basis of their aqueous solubility.     

Synthesis and the third-order non-linear optical properties of new azobenzene-containing side-chain polymers

A new series of aromatic azobenzol compounds containing vinyl have been designed as monomers. The azobenzene-containing side-chain polymers containing azo NLO chromophore in each side chain have been synthesized via free radical polymerization. FT-IR, elemental analysis and ¹H NMR were performed to characterize the azo monomers. The molecular weight of the polymers and their distribution were determined by gel permeation chromatography (GPC). The third-order NLO coefficient of azo monomers and their polymers were measured by degenerated four wave mixing (DFWM) technique. As a result, the enhancement of the molecular conjugation and the increase of the NLO chromophore concentration in the molecular chain contribute much to heightening the third-order NLO effect. The electronic effect of substituent on the azobenzol group and the push–pull electronic structure contributes much to enhancing the NLO property.     

Evaporation-induced self-assembly of organic–inorganic ordered nanocomposite thin films that mimic nacre

The present study attempts to incorporate acrylate-based polymers into ordered lamellar organic–inorganic nanocomposite thin films composed of alternating Poly(TPGDA)/ITO layers. The films were prepared by dip-coating from a homogeneous solution containing the soluble inorganic metal salts (InCl₃·4H2O and SnCl₂·2H₂O), surfactant, cross-linkers, organic monomers, and initiators, thus leading to composite lamellar nanocomposite materials through evaporation-induced self-assembly method. The final polymer/ITO nanocomposite thin film was obtained by a separate free-radical polymerization step, initiated by UV exposure. Structures and composition of the films were characterized using FTIR, XRD, UV–Vis spectrophotometer and TEM. The results indicated that the films were composed of organic and inorganic layers with orderly interlaced arrangement.