Abstract Shape-stable phase change materials (SSPCMs) with visible phase change progress are of great importance to thermal management. Herein, novel SSPCMs were facilely fabricated from 1,2,3-tris-(2,3-Epoxypropoxy) propane, polyethyleneimine (PEI) and poly(ethylene glycol) by sol-gel condensation. The resultant SSPCMs showed good shape stability at 70 ℃, they were temperature sensitive at phase transition, where reversible transparent-opaque transfer for PEG content 45–65 %. Latent heats of the SSPCMs were almost proportional to the PEG content and the highest value reached 131.8 ± 1.9 J/g at PEG content of 86 % (PE-86 %). The curing kinetics were analyzed by the Vyazovkin isoconversional method, the results indicated that the activation energy of PE-86 % was lower than that of pure PEG, suggesting that the supporting matrix had higher reactivity and could accelerate the reaction. Additionally, the SSPCMs also exhibited favorable thermal cycling reliability and thermal stability. The temperature sensitive and excellent thermal performance of the SSPCMs made them of great potential in thermal energy storage applications.

中文翻译：

---

用于热能储存的温度敏感和形状稳定相变材料的溶胶-凝胶凝聚

摘要 具有可见相变过程的形状稳定相变材料（SSPCMs）对热管理具有重要意义。在此，新型 SSPCM 由 1,2,3-tris-(2,3-Epoxypropoxy) 丙烷、聚乙烯亚胺 (PEI) 和聚（乙二醇）通过溶胶-凝胶缩合轻松制造。所得 SSPCM 在 70 ℃ 下表现出良好的形状稳定性，它们在相变时对温度敏感，其中 PEG 含量为 45-65% 时可逆透明 - 不透明转移。SSPCM 的潜热几乎与 PEG 含量成正比，在 PEG 含量为 86% (PE-86%) 时，最高值达到 131.8 ± 1.9 J/g。采用Vyazovkin等转化法分析固化动力学，结果表明PE-86%的活化能低于纯PEG，表明支持基体具有更高的反应性并可以加速反应。此外，SSPCM 还表现出良好的热循环可靠性和热稳定性。SSPCM 的温度敏感性和优异的热性能使其在热能存储应用中具有巨大的潜力。