双光子诱导有机光致变色材料的研究进展

在介绍舣光子诱导有机光致变色材料性能的基础上,重点介绍双光子诱导光致变色材料种类、光致变色原理及在三维信息存储、生物技术研究和荧光共振能量转移方面的应用.最后对双光子诱导有机光致变色材料的研究趋势做了展望.     

光致变色化合物及其在染料颜料中的应用

本文简单介绍了光致变色化合物的主要类型。叙述了光致变色活性染料的合成,举例说明了光致变色有机颜料的制备方法。对光致变色化合物在染颜料中的应用进行了展望。     

光致变色材料的制备、性能及变色机理

光致变色材料可广泛应用于光信息存储、民用生活、防伪、军事等不同领域,引起人们越来越多的关注。本文主要综述了有机类(含螺吡喃、螺噁嗪、偶氮苯、二芳基乙烯、俘精酸酐、席夫碱)、无机类(含多金属氧酸盐、过渡金属氧化物、金属卤化物)以及有机-无机复合类光致变色材料的制备、性能、变色机理和研究进展,同时,简单介绍了光致变色材料的应用,最后对其研究发展做出展望。     

光致变色化合物

介绍了当前在光致变色化合物方面的研究动向。阐述了各类光致变色化合物的特性     

有机光致变色材料最新研究进展

综述了近3年在有机光致变色领域的最新研究进展.重点介绍了在含有有机光致变色基团的二元分子中,光致变色基团作为开关对分子的光电等微观性质的控制.     

常见有机光致变色体系的研究现状

介绍了常见的有机光致变色材料体系,光致变色材料在染料、民用品等方面的应用,开发有机光致变色材料作为记录介质的光盘,已成为高技术领域的一项重大课题。综述了光致变色材料在国际和国内的研究现状。光致变色材料是当前高科技领域重要的研究课题,光致变色材料在光信息存储的高科技领域、在防伪材料、装饰材料、具有广阔的应用价值和发展前景。     

聚苯硫醚纤维的发展和市场前景

聚苯硫醚纤维是一种高性能纤维,主要应用于环保行业,但国产纤维质量与进口产品相比还有一定差距。介绍了聚苯硫醚纤维材料的发展以及应用领域和市场前景,并简要介绍了中国石化天津分公司聚苯硫醚纤维生产实践。     

光致变色玻璃在建筑中的节能性能评估

光致变色玻璃的透光率随光辐射强度的不同而变化,因此,光致变色玻璃可用于调控阳光进入建筑,是具有节能功效的智能玻璃。然而,目前光致变色玻璃在建筑中应用的研究较少,缺少科学评价其节能性能的方法。本文以制备的卤化银光致变色玻璃为研究对象,建立了光致变色玻璃节能性能简化模拟方法。利用DeST能耗软件研究了光致变色玻璃应用于不同建筑中的节能效果,计算和比较了两种变色特性的光致变色玻璃在不同建筑中的冷热负荷和照明能耗。研究结果显示:光致变色玻璃在建筑面积较大且窗墙比0.6以上的公共建筑中,全年节能率最高超过10%;在建筑面积和窗墙比较小的建筑中,其主要作用在于阻隔紫外线和防眩光。本文的方法和结果可为光致变色玻璃节能性能的研究提供参考,对光致变色玻璃的应用推广具有一定的促进作用。     

多酸阴离子的光致变色现象

综述了多酸阴离子的光致变色的研究进展,着重介绍了同多钼酸胺、八钼酸盐、同多和杂多钨酸盐的结构特征以及光致变色的特点,阐述了多酸阴离子的光致变色机理。金属氧化物的光致变色通常是由杂质或晶体缺陷造成的。多酸阴离子的光致变色是由于在光照下,电子从氧的低能态的2p轨道跃迁到金属高能态的d轨道,即配体中的氧→金属(O→M)电荷转移(LMCT)的结果。     

橡胶和纤维的粘合——耐热输送带

该项专利介绍了能使三元乙丙橡胶（EPDM）与纤维材料牢固结合，并且，热老化后粘接强度并不下降的橡胶与纤维材料的粘合方法及用此方法生产的耐热输送带。     

发光纤维的研究进展

介绍了蓄光纤维和荧光纤维(荧光防伪纤维和光致变色纤维)等发光纤维的发光机理、种类、制造方法及各自的用途,以及各种发光纤维的研究进展情况,并对发光纤维的未来发展方向作了展望。今后应开发新型发光材料来降低发光纤维的原料成本     

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.     

Preparation and photochromic behavior of borosilicate aluminate glass for smart window and curtain wall applications

Sunlight-induced photochromic glass exhibits attractive application prospects in the field of architecture materials. In this work, a series of borosilicate aluminate photochromic glasses containing AgCl nanocrystals were prepared. The photochromic property and mechanisms were systematically investigated. The color of the glass turned from transparent to black (or dark grey) under the irradiation of 365 nm ultraviolet light (or sunlight). Placing in a dark environment, the color of photochromic glass gradually restores to its initial state. From the results of in situ TEM and XPS measurement, it is found that the photochromic and self-bleaching behavior of borosilicate aluminate glass originated from the formation and decomposition of silver nanoparticles. Utilizing the photochromic and self-bleaching properties of the glass, the transmittance of the glass could be reversibly modulated. The cycle measurement shows excellent repeatability, demonstrating the potential application of AgCl-contained borosilicate aluminate photochromic glass in the fields of smart building windows and curtain walls.     

Electrospinning of biopolymer nanofibers encapsulated with functional nanoparticles toward core-shell fluorescence encoding

Photochromism has been an efficient approach to improve authenticity of commercial products. In order to prepare an authentication nanofibrous film with mechanical reliability, it has been crucial to improve the engineering production route of the authentication materials. Herein, we electrospun photoluminescent nanofibrous film with a fiber diameter of 50–200 nm from the environmentally-friendly polylactic acid embedded with nanoparticles of rare-earth activated strontium aluminate (NRESA; 10–15 nm). The created nanocomposite film was colorless in daylight, and became an intense green in ultraviolet light. The strontium aluminate photochromic agent must be applied in the nanoparticle form to ensure film transparency by enhancing its dispersion without aggregation in the electrospun polylactic acid nanofiber bulk. An emission peak was observed at 518 nm after excitation of the pigment-polylactic acid nanofibers at 365 nm. Raising NRESA ratio increased the hydrophobic properties of the pigment-polylactic acid nanofibers without changing their visual or mechanical properties. The transparent films showed high photochromic reversibility without exhaustion under numerous exposure cycles of ultraviolet light and darkness. The nanofibrous mats were elastic and flexible. The current technique is an effective strategy for making a variety of anti-counterfeiting substances.     

Trap-induced self-recoverable photochromism of rare-earth doped sodium niobate translucent ceramics

Most photochromic ceramics can back up post-irradiation to achieve color state transition. Unfortunately, color recovery usually requires exposure of material to external physical fields (such as light and heat), which severely limits the application as a convenient energy building material such as smart windows. Here, we report a kind of sodium niobate translucent ceramics whose photochromic effect can be completely self-recoverable without any external physical field stimulation. Based on the analysis of time-response transmittance, up-conversion emission spectra and thermoluminescence spectra, the behavior of carrier migration and trap capture/release in the process of self-recovery photochromic reaction has been proposed. It is believed that the emergence of intermediate trap level is an important factor to produce this spontaneous behavior. Moreover, by controlling the amount of rare earth doping and designing two types of materials with different carrier behaviors, Sm/Er-codoped NaNbO₃ ceramics are regarded as an appropriate candidate for tracing the time of light irradiation and intelligent regulation of smart building materials. This work can promote the fundamental understanding and practical applications of self-recoverable photochromic bulk materials.     

紫精类杂化光致变色材料的研究进展

紫精是良好的电子受体,受光激发后会发生电子迁移,但是其光还原态极不稳定,而杂化的方式可明显提高化合物的稳定性,因此紫精类杂化光致变色材料具有实际应用价值。文章简要综述了近几年的紫精类杂化光致变色化合物的研究进展。     

PVB光致变色夹层安全玻璃的制备及性能研究

以1,2,3,3-四甲基吲哚啉碘化物和5-硝基水杨醛为原料合成了光致变色吲哚啉螺吡喃化合物,并将其制成了一种PVB光致变色夹层安全玻璃,对其抗冲击强度性能和光照前后紫外可见光谱进行了分析测试。结果表明,所制备的PVB夹层安全玻璃符合GB9 962-1999中对安全玻璃强度的技术要求,同时还具有调光作用和光致变色性能。     

Optimisation of organic solvent–pH buffer solutions to improve the photochromic performance of plant‐derived 3‐deoxyanthocyanidin dye

Plant‐derived 3‐deoxyanthocyanidins are photochromic materials that are coloured under ultraviolet (UV) irradiation and decoloured under light‐shielded storage. In this study, the optimised solvent composition is investigated to enhance the photochromic performance of luteolinidin, a 3‐deoxyanthocyanidin derivative. The visible absorbance ratio between the solution after UV irradiation and after storage in the dark, an index of photochromic performance, was found to be affected by the pH of the solution, and the value reached a maximum when the pH of the solution was 5.7. The type of organic solvent, which is necessary to dissolve luteolinidin, also affected the photochromic performance. When diethylene glycol or dipropylene glycol was used, the value of the absorbance ratio was especially large. Furthermore, this optimised solvent composition displayed excellent photochromic properties with an extract from the sorghum grain shell containing a large amount of 3‐deoxyanthocyanins.     

Incorporation of indolinospirooxazine on ethylene-vinyl acetate copolymer to produce a intelligently temperature-regulated nonwhite cool material

Cool materials that adjust cooling efficiency according to sunlight intensity are needed because people have different needs for cooling at different times. Several colors of commercial microencapsulated photochromic powder were melt blended with ethylene-vinyl acetate copolymer in a two-roll mill at 90 °C to prepare the photochromic films of corresponding colors. Pink photochromic films [the organic photochromic compound is indolinospirooxazine (NISO)] were selected to continue the following variable experiment due to its best performance in the indoor cooling test. The pink photochromic films change color as well as transmittance according to the intensity of sunlight, thereby achieving an intelligent cooling effect. A maximum decrease around 10 °C was observed in natural environment when the addition amount of pink photochromic powder reaches 2.0 phr under strong sunlight and all films did not show cooling effect under weak sunlight. This material can be covered on buildings to regulate the indoor temperature. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137, 48887.