The Synthesis And Application Of Photochromic Compounds On Textiles

The non-reactive photochromic spirooxazines were synthesized successfully and the reactive spirooxazine having a dichloro-s-triazinyl was also synthesized in this thesis,and their structures were characterized simply and photochromism was detected.The influence of solution concentration and external environmental factors such as temperature,polarity of solvents,polymer medium,and pH value etc.on the photochromism of spirooxazines was studied.The result showed that:the color of solution became deeper with the increase of solution concentration and reduction of temperature;sprirooxazines exhibited positive solvatochromism effect;the achromatic speed of colored form of spirooxazine could be decreased by low temperature,strong polarity and stiffness of polymer medium;in certain pH range,N-methyl sprirooxazine and N-methyl-9'-dichloro-s-triazinylsprirooxazine exhibited acidichromism,while N-methyl-9'-hydroxysprirooxazine exhibited both acidichromism and alkalichromism, besides,spirooxazines still exhibited photochromism in alkaline environment.The optimum process conditions of printing with spirooxazine color paste were determined by studying the influence of kinds and dosage of adhesive,kinds of fabrics and curing conditions etc.on photochromism of spirooxazine and properties of fabrics. Eventually,fabrics of good photochromism were prepared,and good fatigue resistance was obtained.The reactive spirooxzine was applied onto cotton fabric by adopting the two-bath padding-dyeing,one-step direct printing and two-step direct printing methods;though photochromic effect was obtained by all the three methods,the spirooxaxzine utilization ratio was extremely low,as a result,all the three methods were not feasible;the three methods might be all feasible if reverse optical photochromic compound of reactive anchor was considered to be apllied.The method of anhydrous printing could be adopted to prepare photochromic cotton fabric,however,the printing screen was blocked very easily,as a result,the method was not feasible as well;the method of anhydrous printing might be feasible if the adhesive that could not react with reactive spirooxazine was considered to be applied.