Properties of the photochromic latexes based on spiropyran by emulsion polymerization

Zhang, Ting; Fu, Liuwa; Chen, Zhikang; Cui, Yanyan; Liu, Xiaoxuan

doi:10.5185/amlett.2018.1677

Cited by 1 publication

(1 citation statement)

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“…细乳液聚合是1973年由美国Lehigh大学的Ugelstad首次提出，因粒度均一、操作简单、稳定性高而被广泛应用 [1,2] 。细乳液聚合通常是将非水溶性的聚合单体(如甲基丙烯酸甲酯、丙烯酸丁酯等)，引发剂(偶氮二异丁腈、过硫酸铵等)，助乳化剂(正十六烷等)混合均匀之后加入到溶解了表面活性剂 (十六烷基三甲基氯化铵、正十二烷基磺酸钠等)的水相中，进行预乳化之后，再利用超声剪切力作用在水中形成稳定的细乳液 [3] ，接着在一定温度下通过聚合得到所需的聚合物胶体粒子溶液 [4] 。利用细乳液聚合可以制备各种功能性胶体粒子。例如通过引入螺吡喃、二芳基乙烯等光致变色化合物，可以制备具有光致变色特性的胶体粒子 [5] 。所谓光致变色现象是指在不同光照射下，光致变色基团在两种具有不同物理和化学性质的化学结构之间发生可逆异构化，从而导致化合物发生颜色变化的现象。光致变色化合物作为一种智能材料，在颜色、极性、化学结构、共轭和荧光发射等方面的两种不同状态之间发生变化，也正是由于其特殊的光致变色性质，可以在信息防伪 [6] 、光电开关器件、光化学印刷技术 [7] 、光敏装饰材料、功能染料以及光信息存储等领域有着广泛的应用 [8] 。本新创性实验采用一步细乳液聚合法制备含有螺吡喃衍生物的胶体粒子 [9,10]…”

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Preparation of Photochromic Colloidal Particles by Miniemulsion Polymerization and Investigation of Its Anti-Counterfeiting Applications

Lin¹,

Deng²,

Lu³

et al. 2022

Daxue Huaxue

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Miniemulsion polymerization technology has several advantages, including simple operation, use of green technology, and a wide range of applications, and can be used for innovative experimental teaching for undergraduates. By introducing spiropyran derivatives with photochromic properties into the miniemulsion polymerization, the prepared colloidal particles have apparent photochromic and photoswitchable fluorescent properties, which may further stimulate students' interest in experiments and foster a sense of closeness to scientific research. In this paper, a one-step miniemulsion polymerization method was used to prepare photochromic colloidal particles containing spiropyran derivatives, that's 2-(3',3'-dimethyl-6-nitrospiro[chromene-2,2'-indolin]-1'-yl)ethyl methacrylate (SPMA), at 75 °C for 3 h. The particle size and spectra of the colloidal particles were measured using a laser particle size analyzer, UV-Vis absorption spectrometer, and fluorescence spectrometer. The results show that the particle size of the prepared colloidal particles is approximately 60 nm, and they exhibit obvious photochromic and photoswitchable fluorescent properties under ultraviolet and visible light. Preliminary studies show they have valuable fluorescent anti-counterfeiting applications.

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