螺噁嗪类光致变色材料的制备

以吲哚啉螺噁嗪类光致变色染料、水性聚氨酯为主要成分制备了一种光致变色组合物,并测试了其耐光稳定性。结果表明:制得的光致变色材料经氙灯照射50h后仍然具有良好的光致变色性能,该方法显著提高了吲哚啉螺噁嗪类光致变色材料的耐光稳定性。     

N-甲基螺噁嗪光致变色染料的合成及其光致变色性质研究

以1,3,3-三甲基-2-亚甲基吲哚啉和1-亚硝基-2-萘酚为原料合成了N-甲基-3,3-二甲基螺吲哚啉-2,3'[3H]萘并[2,1-b][1,4]噁嗪,对其进行了紫外和红外光谱以及元素分析,并对其光致变色性质以及主要影响因素温度、溶剂和pH进行了研究.结果表明,该化合物具有良好的光致变色性和一定的酸致变色性;温度、溶剂极性和pH对其光致变色性有不同程度的影响.     

Fabrication of photochromic,hydrophobic, antibacterial,and ultraviolet-blocking cotton fabric using silica nanoparticles functionalized with a photochromic dye

The aim of this work was the fabrication of cotton fabric with multifunctional properties such as photochromic, hydrophobicity, antibacterial, and ultraviolet (UV) blocking. In this regard, a mixture of silica nanoparticles with spirooxazine as a photochromic dye first applied on the cotton fabric, and then, the fabric surface was coated with an alkylsilane compound. The homogenous distribution of silica and silica/spirooxazine hybrid on the cotton fibers was established by field emission scanning electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray mapping. X-ray diffraction patterns confirmed the amorphous nature of the hybrid on the treated cotton fabric. The photochromic effect of the fabrics was measured after 5-min sunlight irradiation. Other characteristics of treated fabrics, such as antibacterial activity, hydrophobic properties, and UV-blocking activity, were also assessed. The results indicated that adding silica nanoparticles to spirooxazine had a tangible effect on photochromic activity of treated cotton fabrics and its photochromic performance was higher than that of the photochromic dye. The fabric showed stable hydrophobicity with static water contact angle values of 141.2° ± 1°. Moreover, the coated cotton fabric demonstrated proper antibacterial properties and UV-blocking activity.     

光致变色染料螺(口恶)嗪对光子晶体能带结构的调节

利用垂直沉积法获得了聚苯乙烯(Polystyrene,PS)蛋白石模板,采用垂直提拉法将SiO2溶胶填充到PS蛋白石模板,制备出SiO2反蛋白石模板,并利用扫描电镜对蛋白石及反蛋白石的微观形貌进行表征.制备了一种光致变色染料渗透入光子晶体结构空隙的复合材料,该结构表现出截然不同于未填充染料时的蛋白石结构的光学性质.通过利用分子聚集体中的协同激励效应带来的折射率的剧变来实现光子晶体能带结构的控制.     

Preparation and photochromic properties of waterborne polyurethane containing spirooxazine groups

Two novel photochromic spirooxazines, SO 1 and SO 3, were successfully prepared and characterized by Fourier transform infrared spectroscopy (FTIR), ¹H-NMR, and mass spectrometry with electrospray ionization (ESI-MS). SO 1 was doped and grafted with waterborne polyurethane (WPU) to afford D₁-WPU and G₁-WPU. D₃-WPU was prepared by doping SO 3 with waterborne polyurethane. FTIR spectra indicated that SO 1 was grafted onto waterborne polyurethane successfully. Scanning electron microscopy proved that spirooxazines of D-WPU can be effectively dispersed in a waterborne polyurethane matrix, and spirooxazines of G-WPU are evenly distributed in the copolymer. The results showed that the light transmittance of modified waterborne polyurethane films decreased compared with pure waterborne polyurethane films, but the water resistance and tensile strength were better. Ultraviolet–visible spectra demonstrated that the thermal stability of spirooxazine derivatives improved significantly after being modified. The fading rate constant of the D₃-WPU film (k = 0.0079 s^-1) during the discoloration process decreased 9.77 times in contrast to SO 3 in ethanol, which showed that the thermal stability of spirooxazine in WPU film was obviously enhanced. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47067.     

9＇-取代吲哚啉螺噁嗪衍生物的合成与光谱性质

将2个9’－羟基吲哚啉螺萘并噁嗪衍生物（Ia、Ib）,进一步以N,N’－二环己基碳二酰亚胺为脱水剂、4－二甲氨基吡啶为催化剂合成了2个9’－丙烯酰氧基吲哚啉螺萘并噁嗪衍生物（IIIa,IIIb）和2个9’－（α－呋喃丙烯酰氧基）吲哚啉螺萘并噁嗪衍生物（Va,Vb）。通过元素分析、^1HNMR和IR对产物的结构进行了表征。将化合物Ⅲa的乙醇溶液浸渍在脱脂棉上,经太阳光照射由无色变为蓝色;当脱脂棉移至阴暗处后,蓝色慢慢变淡消失。光致变色过程循环50次无异常发生,显示出良好的光致变色性能。     

一种用于玻璃智能调光的光致变色薄膜研究

合成了光致变色螺噁嗪染料(SO2),进行了化学结构表征。采用含甲基基团的甲基三乙氧基硅烷(MTES)进行水解缩聚反应,生成染料掺杂的硅溶胶,减少氢键对染料作用,提高变色可逆性。采用溶胶凝胶方法,在玻璃基片上制备光致变色染料掺杂智能调光膜。该染料掺杂膜在褪色态具有较高的透光作用,而在紫外辐射下的呈色态可达到很高的阻挡太阳辐射的效果,可以起到智能调光的作用,具有较好的节能效果和应用前景。     

掺杂聚乙烯基咔唑的螺噁嗪光致变色的性能

将PVK(聚乙烯基咔唑)以不同的比例掺杂至螺噁嗪光致变色化合物的体系中,通过对螺噁嗪开环体紫外-可见光谱和聚乙基咔唑荧光光谱的分析可以得出,掺杂体系中聚乙烯基咔唑中的电子空穴可容纳螺噁嗪光致变色过程中迁移的电子,从而提高了螺噁嗪开环的效率。     

螺噁嗪类光致变色化合物的制备及其在涂料中的应用

通过萘并噁嗪环上引入不同类型的取代基,合成了两种螺噁嗪光致变色化合物,并将其应用于涂料,配备出光致变色聚氨酯涂料。研究了涂料的光致变色性能和抗疲劳性能,结果表明,涂膜在紫外灯照射下由无色变为蓝色,这种变化是可逆的,并且具有较高的抗疲劳性。     

光致变色化合物在毛织物上的应用

合成了1,3,3—三甲基—9′—羟基螺[2H—吲哚—2,3′—[3H]萘并[2,1—b][1,4]噁嗪]光致变色化合物,通过红外光谱分析和元素分析对其结构进行了简单表征。制备了螺噁嗪/PUI-112脂肪族聚氨酯光致变色膜和螺噁嗪/聚丙烯酸丁酯光致变色膜,对其光致变色性质进行了检测和对比,筛选出了较佳的黏合剂。通过先制备出光致变色色浆,后采用类似于颜料印花的方法将其印在毛织物上,制得光致变色毛织物,对其光致变色性质进行检测,获得了很好的光致变色效果;测定织物的耐摩擦色牢度和耐洗色牢度,确定了最佳工艺条件。