Self-regulating heating and self-powered flexibility are pivotal for future wearable devices. However, the low energy-conversion rate of wearable devices at low temperatures limits their application in plateaus and other environments. This study introduces an azopolymer with remarkable semicrystallinity and reversible photoinduced solid-liquid transition ability that is obtained through copolymerization of azobenzene (Azo) monomers and styrene. A composite of one such copolymer with an Azo: styrene molar ratio of 9:1 (copolymer is denoted as PAzo9:1-co-polystyrene (PS)) and nylon fabrics (NFs) is prepared (composite is denoted as PAzo9:1-co-PS@NF). PAzo9:1-co-PS@NF exhibits hydrophobicity and high wear resistance. Moreover, it shows good responsiveness (0.624 s−1) during isomerization under solid ultraviolet (UV) light (365 nm) with an energy density of 70.6 kJ kg−1. In addition, the open-circuit voltage, short-circuit current and quantity values of PAzo9:1-co-PS@NF exhibit small variations in a temperature range of −20 °C to 25 °C and remain at 170 V, 5 μA, and 62 nC, respectively. Notably, the involved NFs were cut and sewn into gloves to be worn on a human hand model. When the model was exposed to both UV radiation and friction, the temperature of the finger coated with PAzo9:1-co-PS was approximately 6.0 °C higher than that of the other parts. Therefore, developing triboelectric nanogenerators based on the in situ photothermal cycles of Azo in wearable devices is important to develop low-temperature self-regulating heating and self-powered flexible devices for extreme environments.

中文翻译：

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低温自调节加热和自供电柔性纤维织物


自调节加热和自供电的灵活性对于未来的可穿戴设备至关重要。然而，可穿戴设备在低温下的低能量转化率限制了它们在高原和其他环境中的应用。本研究介绍了一种具有显着半结晶性和可逆光诱导固液转变能力的偶氮聚合物，它是通过偶氮苯 （Azo） 单体和苯乙烯共聚获得的。制备了一种这样的共聚物与偶氮：苯乙烯摩尔比为 9：1（共聚物表示为 PAzo9：1-共聚苯乙烯 （PS））和尼龙织物 （NFs）（复合材料表示为 PAzo9：1-co-PS@NF）的复合材料。PAzo9：1-co-PS@NF 表现出疏水性和高耐磨性。此外，它在能量密度为 70.6 kJ kg-1 的固体紫外 （UV） 光 （365 nm） 下异构化过程中表现出良好的响应性 （365 s-1）。此外，PAzo9：1-co-PS@NF 的开路电压、短路电流和量值在 −20 °C 至 25 °C 的温度范围内变化很小，分别保持在 170 V、5 μA 和 62 nC。值得注意的是，所涉及的 NF 被切割并缝制成手套，以佩戴在人手模型上。当模型同时暴露在紫外线辐射和摩擦下时，涂有 PAzo9：1-co-PS 的手指的温度比其他部件的温度高约 6.0 °C。因此，在可穿戴设备中开发基于 Azo 原位光热循环的摩擦纳米发电机对于开发适用于极端环境的低温自调节加热和自供电柔性器件非常重要。