聚氨酯-螺噁嗪光致变色微胶囊的制备及性能

以光致变色化合物螺噁嗪为芯材,聚氨酯为壁材,通过界面聚合法制备了光致变色微胶囊。采用扫描电镜、透射电镜、Zeta纳米粒度电位分析仪、红外光谱对光致变色微胶囊的形貌、粒径和结构进行了表征。结果表明,微胶囊为圆球形,芯材表面有聚氨酯生成,且表面光滑、完整,致密性能良好,具有明显的核壳结构,平均粒径为2.880μm,PDI值为0.087,且分布集中。微胶囊的变色效果、化学稳定性和耐疲劳性测试表明:光致变色微胶囊变色灵敏度为2.20,且可逆,不溶于乙醇、甲苯、环己烷等有机溶剂;与螺噁嗪相比,耐疲劳性得到提高,日晒30 d后其变色灵敏度仍为2.17。

Preparation and properties of polyurethane-spiroxazine photochromic microcapsules

Photochromic microcapsules are prepared by interfacial polymerization using spirooxazine as core material and polyurethane as wall material.The morphology,size and structure of photochromic mi?crocapsules are characterized by scanning electron microscopy,transmission electron microscopy,zeta nano particle size potential analyzer and infrared spectroscopy.The microcapsules are spherical with smooth and complete surface,good compactness,obvious core-shell structure,average particle size of 2.880μm,PDI value of 0.087 and concentrated distribution.The color change effect,chemical stability and fatigue resistance of the microcapsules show that the color change sensitivity of the photochromic microcapsules is 2.20 and reversible,which is insoluble in ethanol,toluene,cyclohexane and other organ?ic solvents.Compared with spirooxazine,the fatigue resistance is improved,and the color change sensi?tivity is still 2.17 after 30 d of sun exposure.