Dual-responsive cellulose fabric based on reversible acidichromic and photoisomeric polymeric dye containing pendant azobenzene
Dual-responsive cellulose fabric based on reversible acidichromic and photoisomeric polymeric dye containing pendant azobenzene
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DOI：
10.1016/j.snb.2018.02.131
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发表时间：
2018-08
期刊：
影响因子：
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通讯作者：
Haiyan Mao;Ling Lin;Zhipeng Ma;Chaoxia Wang
中科院分区：
文献类型：
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作者：
Haiyan Mao;Ling Lin;Zhipeng Ma;Chaoxia Wang
为了赋予纺织品更好的智能特性，采用水性聚氨酯和偶氮苯发色团为原料，通过聚合物染料的涂覆，开发了一种酸性和紫外线双重响应的纤维素织物。偶氮苯发色团通过化学键结合到聚氨酯链中，提高了聚氨酯的热稳定性。当pH值从6降低到1时，聚合物染料及其涂层织物的最大吸收峰从410 nm移至520 nm，并伴随着由重氮型向腙型结构转变引起的由黄色向阿马兰斯色的明显颜色变化。聚合物染料的酸变色性质也呈现出突出的重复稳定性。在紫外光照射下，聚合物染料中的反式异构体迅速转化为顺式异构体（1 s），而在黑暗中，由于聚氨酯链的分子量和体积较大，其恢复速度要慢得多（6 h）。非反式异构体，涂层织物在交替的紫外线照射和黑暗后呈现介于黄色和橙子之间的轻微颜色变化。具有可逆的酸致变色和光致异构特性的刺激响应纤维素织物可以用于开发用于监测环境变化的可穿戴和柔性传感器。
An acid and UV dual-responsive cellulose fabric was developed via coating with a polymeric dye based on waterborne polyurethane and azobenzene chromophore to provide additional smart characteristics for textiles. The incorporation of azobenzene chromophore into polyurethane chain through chemical bonding enhanced the thermal stability. The maximum absorption peak of the polymeric dye and its coated fabric shifted from 410 nm to 520 nm upon pH decreasing from 6 to 1, accompanying with pronounced color change from yellow to amaranth due to structural transition from diazo to hydrazone form. The acidichromic property of the polymeric dye also presents an outstanding repetition stability. Thetrans-isomers in the polymeric dye transformed intocis-isomers rapidly (1 s) in response to UV irradiation, while its recovery was much slower (6 h) in dark due to the large molecular and volume of polyurethane chains. Upontrans-cisisomerism, the coated fabric presented slight color change between yellow and orange after alternative UV irradiation and dark. The stimuli-responsive cellulose fabric with reversible acidichromic and photoisomeric properties can be a promising candidate for developing a wearable and flexible sensor to monitor environmental changes.