首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 93 毫秒
1.
单自兴  陈建国 《化学试剂》1998,20(3):163-165,171
研究了L-(+)-2-氨基-1-对硝基苯基-1,3-丙二醇及其N-酰化产物在不同条件下的硼化反应,分别得到稀烃,三配位硼酸酯和四配位硼螺环化合物。  相似文献   

2.
贺灿欣 《化学试剂》1996,18(4):204-206,236
报道了螺二邻二亚甲基噻吩和环二邻二亚甲基噻吩的硫转换法合成。硫转换试剂1,1'-硫-双苯并咪唑与2,3-二羟亚甲基噻吩作用生成活性中间体2,3-二甲甲基-2,3-二氢化噻吩7,后者在室温条件下通过双自由基聚合成螺二邻二亚甲基噻吩8和环二邻二亚甲基噻吩9。螺环化合物8和环状化合物9的结构由波谱分析给予确定。  相似文献   

3.
张正  王天桃 《江苏化工》1996,24(4):33-34,53
1,3-二甲基-2-咪唑啉酮的合成及其在有机、高分子合成中的应用。  相似文献   

4.
2,2′,7,7′-四碘-9,9′-螺二芴具有特殊的螺形结构,它是合成空穴导电材料OMeTAD和TAD及其它一些导电高分子的关键中间体,我们发展了一种条件温和简便的方法,高产率地合成了目标分子。  相似文献   

5.
2—氯—5—甲基吡啶的制备   总被引:4,自引:0,他引:4  
薛苏生 《农药》2001,40(5):17-17
以3-甲基吡啶-1-氧化物为起始原料,经与有机氮碱反应,然后与亲电子化合物反应得到中间体三烷基-(5-甲基吡啶-2-基)氯化铵,再与氯化剂进行反应制备2-氯-5-甲基吡啶。  相似文献   

6.
测定了25℃时HCOOH-H2O-有机胺和CO2-NaOOCH-H2O-有机胺系统的平衡数据。通过对复合平衡过程的分解和简化,利用Pitzer方程和NRTL方程,建立了CO2-NaOOCH-H2O-有机胺复合平衡系统的热力学模型。模型计算值与实验值的吻合情况良好。  相似文献   

7.
陈国松  姚成 《化学试剂》1996,18(6):337-339,345
在pH4.P的介质中W(Ⅳ)与 新有机试剂4-(50溴-2-噻唑偶氮)邻苯二酚和二苯形成稳定的紫红色电中性三元离子缔合物,其组成比W(Ⅳ):5-Br-TAPC:DPG为1:2:2。  相似文献   

8.
本文报道了有机中间体1-萘胺-4-磺酸钠中1-萘胺含量的反相高效液相色谱的分析,方法采用Zorbax-C18柱,以50:50的甲醇/水为流动相。方法具有简单,准确,精度高的优点。  相似文献   

9.
溶胶—凝胶光学材料研究进展   总被引:7,自引:0,他引:7  
溶胶-凝胶技术的许多优点特别适合制备现代高科技领域的光学和光电子材料。该技术在光学材料的合成和制备方面的应用已形成了一门新的分支学科-溶胶-凝胶光学。本文系统论述了溶胶-凝胶光学材料的制备工艺特点,着重介绍了有机掺杂玻璃、有机改性陶瓷 、纳米掺杂非线性光复合材料高性能光学材料,并讨论了溶胶=凝胶光学材料的未来趋势。  相似文献   

10.
介绍由有机膦酸盐乙二胺四甲叉膦和聚羧酸水解聚马来酸酐组成的锅炉水处理剂--E-M栩方及其应用实例。  相似文献   

11.
将高分子和各种功能的无机纳米粒子通过层层吸附自组装技术进行组装,制备厚度可控和稳定性好的有机/无机纳米复合薄膜。综述了该领域研究的最新进展,介绍了利用LBL技术制备有机/无机纳米复合薄膜的方法,并对利用LBL技术制备有机/无机纳米复合薄膜的发展趋势作了展望。  相似文献   

12.
The separation properties of water/organic solvent mixtures in poly(lactic acid) (PLA) films were investigated. The organic solvent flux increased linearly as the feed concentration increased, whereas the water flux was almost constant up to a feed concentration of 30 wt %. Interestingly, the permselectivity of PLA films was reversed from organic solvent selectivity to high water selectivity depending on the type of organic solvent. The permselectivity was strongly correlated with the solution concentration at which the solvent‐induced crystallization of the PLA films occurred. The selectivity of permeation, solution, and diffusion in water/organic solvent mixtures was determined by the expanded free volume of the PLA films as a result of the interaction between PLA and the water/organic solvent mixture. The permeability behavior of water/organic solvent mixtures in PLA films was very complex. However, it was found that this behavior could be predicted through immersion tests. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133, 43822.  相似文献   

13.
The effects of 60 organic solvent on poly(lactic acid) (PLA) were systematically investigated using the Hansen solubility parameter (HSP). The hydrogen bonding solubility parameter accurately reflects the solubility of PLA films using HSP but it depends on hydrogen bonding, as well as dispersion and polar parameters. The PLA films immersed in organic solvent became cloudy and showed no changes in chemical structure. However, solvent‐induced crystallization of the PLA films was observed. Crystalline structures do not dependent on the organic solvent but on the degree of swelling. The organic solvent‐induced crystallization formed a crystallized mixture of a‐ and β‐forms. The density of the crystalline PLA films was lower than that of amorphous PLA films. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013  相似文献   

14.
To design an organic–inorganic composite material with colloidal silica as the inorganic component, an acrylic resin emulsion and an organic silane hybridized acrylic resin emulsion were prepared by emulsion polymerization. The organic–inorganic composite films were prepared by blending the emulsion and the colloidal silica. The contact angles for water, gloss at 60°, and the transparencies of those films were measured. The dispersion state of colloidal silica in films was observed with a scanning electron microscope (SEM) and a transmission electron microscope (TEM). From these results, the contact angle for water of the organic–inorganic composite film obtained from the silane hybridized acrylic resin emulsion was lower than that of the organic–inorganic composite film obtained from an acrylic resin emulsion. The contact angles for water in organic–inorganic composite films with colloidal silicas were lower than those of the films without the colloidal silicas. The films prepared from silane hybridized acrylic resin emulsion composites with colloidal silicas of less than 100 nm were more hydrophilic. SEM and TEM observations demonstrated that some aggregations of the small colloidal particle silica were densely dispersed on the film surface. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 2051–2056, 2006  相似文献   

15.
孙萌萌  浦敏锋  曹灿  刘梅堂 《广州化工》2010,38(12):100-101,122
以精制钠基蒙脱石(Na-MMT)、有机化蒙脱石(OMMT)和聚乙烯醇(PVA)为原料,通过水溶液插层-流延成膜法制备纳米复合薄膜。通过X射线衍射(XRD)、扫描电子显微镜(SEM)和热重分析(TGA)对复合材料的结构和性能进行表征,重点探讨蒙脱石有机化对PVA/MMT复合薄膜性能的影响。结果表明Na-MMT和OMMT纳米颗粒在PVA基体中均得到了良好分散;有机改性剂的存在促使PVA/MMT复合薄膜的MMT片层间距扩撑更大,但由于其与PVA相容性较差,导致有效插入MMT片层间的PVA分子较少,PVA/MMT复合薄膜的热稳定性改善效果不明显。  相似文献   

16.
Light outcoupling from organic light-emitting diodes (OLEDs) is essential for developing energy-saving displays and efficient lighting sources. Nanocrystallized organic thin films exhibiting scattering features have been considered as effective light extractors for OLEDs. This paper reviews recent advancements in nanocrystallized thin films and their applications in OLEDs. Due to the advantages of easy preparation and OLED compatibility, nanocrystallized organic thin films can integrate with OLEDs as external or internal light extractors easily. Significant light enhancement has been achieved. The fabrication methods and mechanisms of light enhancement are discussed.  相似文献   

17.
With the goal of developing a waterborne coating material that prevents staining, organic-inorganic composites prepared from colloidal silica and two types of acrylic resin emulsions were investigated as exterior coatings. conventional acrylic resin emulsion and organic silane hybridized acrylic resin emulsion prepared by emulsion polymerization were mixed with colloidal silica to form organic-inorganic comiposite films. The addition of colloidal silica to emulsions yielded films with higher hydrophilicities, as indicated by lower water contact angles for these films in comparison to films without colloidal silica. The water contact angles of organic silane hybridized acrylic resin emulsion/colloidal silica films were lower than those of acrylic resin emulsion/colloidal silica films. Composite films containing colloidal silica particles smaller than 100 nm in diameter showed high hydrophilicities. Observations of the dispersed state of colloidal silicaparticles in organic-inorganic composite films by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) demonstrated that colloidal silica particles were densely aggregated on the film surface. Outdoor exposure tests of the coating materials prepared from organic silane hybridized acrylic resin and colloidal silica particles with diameters of 7.5 nm showed excellent stain resistance.  相似文献   

18.
Two different kinds of organic polyelectrolyte (PE)/inorganic silicate nanolaminates carrying dissimilar interfacial adhesion between the organic and the inorganic layers were prepared using the layer-by-layer self-assembly. To investigate the mechanical behavior of the prepared hybrid films, apparent modulus (E'), hardness (H), and crack length were measured by depth-sensing nanoindentation as well as a microVickers experiment. The fracture toughness of the hybrid films was then calculated based on the measured mechanical values. In the case of forming strong interfacial adhesion between the organic and the inorganic layers (A series), the fracture toughness and the crack resistance of hybrid multilayer films were significantly improved as a result of the redistribution of stress concentration and the dissipation of fracture energy by the plasticity of organic PE layers. On the other hand, samples with relatively low interfacial adhesion between the organic and the inorganic layers (T series) had little effect on the improvement of fracture toughness of the hybrid films.  相似文献   

19.
Two different kinds of organic polyelectrolyte (PE)/inorganic silicate nanolaminates carrying dissimilar interfacial adhesion between the organic and the inorganic layers were prepared using the layer-by-layer self-assembly. To investigate the mechanical behavior of the prepared hybrid films, apparent modulus (E′), hardness (H), and crack length were measured by depth-sensing nanoindentation as well as a microVickers experiment. The fracture toughness of the hybrid films was then calculated based on the measured mechanical values. In the case of forming strong interfacial adhesion between the organic and the inorganic layers (A series), the fracture toughness and the crack resistance of hybrid multilayer films were significantly improved as a result of the redistribution of stress concentration and the dissipation of fracture energy by the plasticity of organic PE layers. On the other hand, samples with relatively low interfacial adhesion between the organic and the inorganic layers (T series) had little effect on the improvement of fracture toughness of the hybrid films.  相似文献   

20.
In this work we report the synthesis process and properties of PMMA‐ZrO2 organic–inorganic hybrid films. The hybrid films were deposited by a modified sol‐gel process using zirconium propoxide (ZP) as the inorganic (zirconia) source, methyl methacrylate (MMA) as the organic source, and 3‐trimetoxy‐silyl‐propyl‐methacrylate (TMSPM) as the coupling agent between organic and inorganic phases. The films were deposited by dip coating on glass slide substrates from a hybrid precursor solution containing the three precursors with molar ratio 1 : 0.25 : 0.25 for ZP, TMSPM, and MMA, respectively. After deposition, the hybrid thin films were heat‐treated at 100°C for 24 h. The macroscopic characteristics of the hybrid films such as high homogeneity and high optical transparence evidenced the formation of a cross‐linked, interpenetrated organic–inorganic network. The deposited PMMA‐ZrO2 hybrid films were homogeneous, highly transparent and very well adhered to substrates. Fourier Transform Infra‐Red measurements of the hybrid films display absorption bands of chemical groups associated with both PMMA and ZrO2 phases. The amounts of organic and inorganic phases in the hybrid films were determined from thermogravimetric measurements. The surface morphology and homogeneity of the hybrid films at microscopic level were analyzed by scanning electron microscopy and atomic force microscopy images. From the analysis of optical transmission and reflection spectra, the optical constants (refraction index and extinction coefficient) of the hybrid films were determined, employing a physical model to simulate the hybrid optical layers. The refraction index of the hybrid films at 532 nm was 1.56. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132, 42738.  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号