Temperature-Responsive Structurally Colored Fibers via Blend Electrospinning
Temperature-Responsive Structurally Colored Fibers via Blend Electrospinning
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DOI：
10.1021/acsapm.3c00222
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发表时间：
2023-03
影响因子：
5
通讯作者：
M. W. Williams;James Aaron Wimberly;Ratib M Stwodah;Jimmy Nguyen;Paola A. D’Angelo;Christina Tang
中科院分区：
文献类型：
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作者：
M. W. Williams;James Aaron Wimberly;Ratib M Stwodah;Jimmy Nguyen;Paola A. D’Angelo;Christina Tang
实现随温度改变颜色的纤维可能对传感器和智能可穿戴纺织品（织造和非织造）等应用有前途。在这项研究中，温度响应性胆固醇酯液晶配方共混聚己内酯或聚苯乙烯使用氯仿作为溶剂的静电纺丝，以实现热致变色非织造产品。使用聚苯乙烯，珠状纤维实现和热致变色行为仅在偏振光显微镜下观察。为了获得具有通过摄像机或智能手机观察到的可见热致变色行为的纤维，聚己内酯被用作载体聚合物。聚苯乙烯和聚己内酯之间的比较提供了对聚合物/溶剂选择的深入了解，通过共混加工获得响应性材料。用聚己内酯、10wt%聚己内酯与15wt%液晶的共混物形成的纤维（纤维含有60wt%液晶）实现高液晶负载。彩色纤维可以通过改变液晶的配方来实现。例如，在环境条件下为绿色的液晶制剂产生在环境条件（22 ℃）下为绿色的纤维。非织造纤维也表现出随温度变化的动态颜色。例如，液晶制剂在环境条件下是无色的，并且当在32 ° C和37 °C之间加热和冷却时经历从红色到蓝色的可逆颜色变化。当掺入纤维中时，纤维垫从环境条件下的白色变为32 °C下的红色，再变为37 °C下的蓝色。颜色变化在多个循环中是可逆的。
Achieving fibers that change color with temperature may be promising for applications such as sensors and smart wearable textiles (woven and nonwoven). In this study, temperature-responsive cholesteryl ester liquid crystal formulations were blended with polycaprolactone or polystyrene using chloroform as a solvent for electrospinning to achieve thermochromic nonwoven products. Using polystyrene, beaded fibers were achieved and the thermochromic behavior was only observed under polarized light microscopy. To achieve fibers with visible thermochromic behavior observed by a video camera or smart phone, polycaprolactone was used as a carrier polymer. The comparison between polystyrene and polycaprolactone provides insight into polymer/solvent selection achieving responsive materials via blend processing. High loadings of liquid crystal were achieved with polycaprolactone, blends of 10 wt % polycaprolactone with 15 wt % liquid crystal formed fibers (fiber contained 60 wt % liquid crystal). Colored fibers could be achieved by varying the formulation of the liquid crystal. For example, liquid crystal formulations that were green at ambient conditions resulted in fibers that were green at ambient conditions (22 °C). Nonwoven fibers with dynamic color with temperature were also demonstrated. For example, liquid crystal formulations were colorless at ambient conditions and underwent a reversible color change from red to blue when heated and cooled between 32 and 37 °C. When incorporated into fibers, the fiber mats changed from white at ambient conditions to red at 32 °C to blue at 37 °C. The color change was reversible over multiple cycles.