Phase change materials (PCMs) involving significant amounts of latent heat absorbing and releasing at a constant transition temperature have been extensively utilized for thermal management of electronic devices. However, it is still a great challenge to apply thermal management for wearable devices using PCMs due to their solid rigidity and liquid leakage. Although considerable efforts have been dedicated to constructing flexible composite PCMs by physically blending bulk PCMs with different flexible polymers, design and fabrication of intrinsically flexible PCM films still remain unexplored. Herein, we report an intrinsically flexible PCM film with apparent solid-solid phase transition performance, outstanding self-support and shape-conformable property for wearable thermal management. Remarkably, the as-obtained PCM film behaves adjustable phase transition enthalpy and temperature in the region from about (5 to 60)°C, long-term cycling stability up to 1000 cycles, highly mechanical flexibility and remarkable shape tailorability and foldability. Notably, such flexible PCM films are easily integrated into wearable devices with a flexible graphene film as thermal source, revealing superior temperature control behaviors, together with unprecedented electro-thermal and photo-thermal energy conversion performance. The intrinsically flexible PCM film developed in this work is holding great potential for next-generation flexible thermal management electronics.

在恒定的转变温度下，涉及大量潜热吸收和释放的相变材料（PCM）已被广泛用于电子设备的热管理。然而，由于其固体刚度和液体泄漏，将热管理应用于使用PCM的可穿戴设备仍然是一个巨大的挑战。尽管已经投入了相当大的努力来通过将本体PCM与不同的柔性聚合物物理掺混来构造柔性复合材料PCM，但是本征柔性PCM膜的设计和制造仍未得到探索。在本文中，我们报告了一种具有固有固-固相变性能，出色的自支撑性和可形变特性的可穿戴热管理特性的本征柔性PCM膜。值得注意的是 所获得的PCM膜在约（5至60）°C的范围内具有可调节的相变焓和温度，高达1000个循环的长期循环稳定性，高度的机械柔韧性以及显着的形状适应性和可折叠性。值得注意的是，这种柔性PCM薄膜很容易以柔性石墨烯薄膜作为热源集成到可穿戴设备中，从而展现出卓越的温度控制行为以及前所未有的电热和光热能转换性能。在这项工作中开发出的内在柔性PCM薄膜在下一代柔性热管理电子产品中具有巨大的潜力。高度的机械柔韧性以及出色的形状可定制性和可折叠性。值得注意的是，这种柔性PCM薄膜很容易以柔性石墨烯薄膜作为热源集成到可穿戴设备中，从而展现出卓越的温度控制行为以及前所未有的电热和光热能转换性能。在这项工作中开发出的内在柔性PCM薄膜在下一代柔性热管理电子产品中具有巨大的潜力。高度的机械柔韧性以及出色的形状可定制性和可折叠性。值得注意的是，这种柔性PCM薄膜很容易以柔性石墨烯薄膜作为热源集成到可穿戴设备中，从而展现出卓越的温度控制行为以及前所未有的电热和光热能转换性能。在这项工作中开发出的内在柔性PCM薄膜在下一代柔性热管理电子产品中具有巨大的潜力。