共查询到18条相似文献,搜索用时 81 毫秒
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螺(口恶)嗪是一类重要的光致变色化合物,与研究最多的螺吡喃化合物相比,其主要优点是热稳定性高、抗疲劳性强。做为光致变色光存贮材料,它是一类值得重视的化合物,但关于此类化合物的研究却还很少。限制此类化合物在光致变色光存贮材料中应用的最大困难是它们的最大吸收(一般在650nm左右)与现有半导体激光器的光源波长(一般大于750nm)不相适应。 相似文献
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在超声波辐射条件下,以Fischer碱、1-亚硝基-2,7-二羟基萘为原料,无水乙醇为溶剂快速合成了三个螺嗪类光致变色化合物,通过1 H NMR、IR对目标产物的结构进行了表征,讨论了超声辐射时间对合成产率的影响,利用超声波法合成螺噁嗪类光致变色化合物反应速率快、产率有所提高. 相似文献
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螺噁嗪光致变色反应机理研究进展 总被引:2,自引:0,他引:2
20世纪80年代中期以来, 关于螺噁嗪在光致变色过程中的光化学和光物理现象的研究非常活跃. 综述了近20年来对溶液中的螺噁嗪、晶体螺噁嗪以及固体介质中的螺噁嗪的光致变色机理研究结果, 同时介绍了实验研究方法和理论研究方法在螺噁嗪光致变色过程研究中的应用, 分析了取代基对光致变色性质的影响. 阐述了机理研究对新型螺噁嗪设计合成的重要指导意义. 相似文献
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20世纪80年代中期以来, 关于螺噁嗪在光致变色过程中的光化学和光物理现象的研究非常活跃. 综述了近20年来对溶液中的螺噁嗪、晶体螺噁嗪以及固体介质中的螺噁嗪的光致变色机理研究结果, 同时介绍了实验研究方法和理论研究方法在螺噁嗪光致变色过程研究中的应用, 分析了取代基对光致变色性质的影响. 阐述了机理研究对新型螺噁嗪设计合成的重要指导意义. 相似文献
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Hideshi Hattori Toshiyuki Uryu 《Journal of polymer science. Part A, Polymer chemistry》1999,37(17):3513-3522
The novel photochromic liquid-crystalline polyacrylates containing a spirooxazine group were synthesized. The photochromic polymer containing (4-penta- methyleneoxy)biphenylene moiety at the 5-position of spironaphthoxazine showed nematic phase from 122.9 to 133.8°C. The photochromic polymer containing undeca- methylene instead of pentamethylene showed smectic phase from 93.1 to 169.7°C. On the other hand, the photochromic polymer containing both undecamethylene as a spacer and spironaphthoxazine-bound biphenylene moiety at 9′-position did not show any liquid crystallinity. All spirooxazine-containing liquid-crystalline polymers showed photochromism in the solid state at room temperature. Because the shape of the absorption spectra of the photochromic quenched liquid-crystalline polymer films was almost the same as those of the photochromic amorphous polymer films, the photochromic properties did not depend on the mesophase in the polymers examined. © 1999 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 37: 3513–3522, 1999 相似文献
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A novel spirooxazine (SO) compound was designed and synthesized. Macromolecular materials, called SO-g-hPMMAs (where the g means grafting and the h means partial hydrolysis), were prepared using PMMA (polymethylmethacrylate) with different degrees of hydrolysis. SO-g-5%hPMMA was prepared by reacting SO-containing active C-Br bonds with 5% partially hydrolyzed PMMA. The SO was characterized using 1H NMR and infrared. Beyond that, photochromic properties were studied in detail. We discuss the effects of hydrochloric acids and hPMMAs of different hydrolysis degrees on photochromic properties of SO-g-hPMMA. Additionally, mechanical properties of the material were studied. Results indicate that the colored ring-opening form (PMC) of SO-g-hPMMA exhibits a good performance in terms of thermal stability, in contrast to the homologous SO. Experiments additionally demonstrate that hydrochloric acid improves the PMC’s thermal stability. SO-g-9%hPMMA demonstrated a good performance of photochromic properties compared to those with different degrees of hydrolysis. 相似文献
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伯溴代烷的微波快速合成法 总被引:3,自引:0,他引:3
198 6年R .J.Gignere[1 ] 和R .Gedye[2 ] 首次报道将微波用于有机合成反应以来 ,大量实验事实证明[3] 微波不仅能极大地提高某些化学反应速率 ,而且能使一些在常规加热条件下几乎不能进行的反应得以完成、获得满意的收率。用伯醇在溴化氢溶液中微波条件下发生反应制备了伯溴代烷。1 实验部分WhirlpoolT1 2 0X微波炉 (四川大学无线电系改装 ,可连续发射微波 ,功率连续可调 )、WZS -I阿贝折光仪 (未校正 )。工业溴化氢 (C =40 % ,d =1 38) ,其余试剂均为CP级。合成通法 将适量的醇、一定量的浓硫酸和过… 相似文献
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Spirobenzopyran 1 , with the 3-(diethoxymethylsilyl)-propyl group at the N atom, was synthesized. The condensation reaction of the spiropyran 1 and diethoxydimethylsilane gave oligomeric poly(dimethylsiloxane) with the spiropyran moiety in the side chain. The oligomer was photochromic; its colour changed from colorless to purple-red on uv irradiation and the color faded on visible irradiation or on standing in the dark. The half-decay time of the thermal decoloration was about twice that of monomeric spiropyran dissolved in the dimethylsiloxane oligomer. Photochromic poly(dimethylsiloxane) with the spirooxazine moiety in the side chain was also prepared. 相似文献
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Microwave-assisted acyl chloride-isonitrile condensation and CaCO3-mediated hydrolysis constitute a one-pot, 2-minute process to prepare α-ketoamides. 相似文献
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合成了分子结构中含活性C—Br键的N-乙基-9′-正溴丁氧基螺噁嗪(Br-SO),利用Br-SO分子结构中的化学基团C—Br与部分水解的聚甲基丙烯酸甲酯(hPMMA)反应制备含SO的PMMA高分子化合物(SO-hPMMA)。采用1 HNMR和IR对Br-SO结构进行了表征,研究了Br-SO、SO-hPMMA的光致变色性能及其影响因素。研究表明:Br-SO、SO-hPMMA均具有良好的光致变色性能,且SO-hPMMA的热稳定性明显高于Br-SO。 相似文献