纤维素基光致变色水凝胶制备及其织物应用性能

Preparation of cellulose-based photochromic hydrogels and application properties in fabrics

摘要:

光致变色材料与纤维亲和力差、难上染，这些问题导致光致变色织物的发展受限。针对此问题，本研究以纤维素、螺吡喃为基体，在环氧氯丙烷交联作用下，制备纤维素基光致变色水凝胶(CPHs)，并探索了新型光致变色水凝胶的变色能力及影响规律。扫描电镜结果显示：CPHs具有三维网络多孔结构。将CPHs作为新型光致变色材料和织物整理剂，采用常规浸轧整理可获得光致变色性能较好的棉织物。UV-Vis结果表明：所制备的光致变色织物在紫外光及可见光照射下具有快速的光致变色响应性，在2-3 min内实现快速着色褪色；更重要的是，皂洗前后的光致变色织物均可以保证10次以上可逆循环变色，这进一步证明CPHs具有优异的光致变色循环能力及耐光疲劳性，且与棉织物具有较强的亲和力。该研究为新型光致变色材料、水凝胶织物整理剂及智能化变色织物的开发提供新应用思路。

Abstract:

Photochromic materials have poor affinity with fibers and are difficult to dye, which limits the development of photochromic fabrics. To solve these problems, cellulose-based photochromic hydrogels (CPHs) were prepared by using cellulose and spiropyrane as matrix under the crosslinking of epichlorohydrin, and the photochromic regularity of the new photochromic hydrogels were investigated. SEM results showed that CPHs had a three-dimensional network porous structure. As a new photochromic material and fabric finishing agent, CPHs were finished by conventional dipping process to obtain photochromic cotton fabrics. The UV-Vis results showed that the photochromic fabric had fast photochromic response in UV and achieved fast coloring and fading within 2-3 min. More importantly, the photochromic fabric can hold on more than 10 reversible cycles of color change no matter before and after soap washing, which further proved that CPHs had excellent photochromic cycle ability and light fatigue resistance, and has a strong affinity with cotton fabric. This work provided new application ideas for the development of new photochromic materials, hydrogel fabric finishing agents and intelligent color-changing fabrics..