At present, the demand for green energy has reached a new height in history, and thermal energy storage technology has been widely used to reduce energy consumption. It is still a challenge to develop bio-based polymeric form-stable phase change materials (FSPCMs) with high enthalpy value and thermal conductivity (TC), short curing time, and multifunctional properties. This work not only exploited a series of adjustable and photo-curable comb/bottle brush bio-based epoxy resin/beeswax (bw) FSPCMs with the above superiorities, but also revealed the effects of cross-linking density on the energy storage capacity and encapsulation rate of the FSPCMs. As a result, the optimal system can encapsulate the maximum amount of bw (60 wt%) and obtain the highest enthalpy value (142.1 J/g) with only 0.5% enthalpy loss. Through further introducing the optimal curing system into the copper (Cu) foam, the electromagnetic interference shielding property, TC, tensile strength, and photo-thermal conversion efficiency of the final composite (modified by Cu of 95% porosity) can reach 110 dB, 2.387 W mK, 2.81 MPa, and 80%, respectively, and the enthalpy value (84.2 J/g) is still satisfactory. This study can provide theoretical guidance for the structural design of reliable fast photo-curable bio-based polymeric FSPCMs with excellent phase change performances and multifunctional properties.

中文翻译：

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高热值、高导电率、多功能光固化生物基梳子/瓶刷环氧树脂/蜂蜡/泡沫铜相变材料

当前，绿色能源的需求已达到历史新高度，热能储存技术已被广泛应用，以降低能源消耗。开发具有高焓值和导热率（TC）、短固化时间和多功能特性的生物基聚合物形态稳定相变材料（FSPCM）仍然是一个挑战。这项工作不仅开发了一系列具有上述优点的可调节、光固化梳子/瓶刷生物基环氧树脂/蜂蜡（bw）FSPCM，而且揭示了交联密度对储能容量和封装的影响FSPCM 的速率。结果，最优系统可以包封最大量的bw（60 wt%）并获得最高的热函值（142.1 J/g），而热函损失仅为0.5%。通过在泡沫铜（Cu）中进一步引入优化的固化体系，最终复合材料（95%孔隙率的Cu改性）的电磁干扰屏蔽性能、TC、拉伸强度和光热转换效率可达到110 dB，分别为2.387 W mK、2.81 MPa和80%，而焓值（84.2 J/g）仍然令人满意。该研究可为可靠的快速光固化生物基聚合物FSPCM的结构设计提供理论指导，该FSPCM具有优异的相变性能和多功能特性。