以癸酸(CA)与肉豆蔻酸(MA)复合制备的CA-MA二元低共熔脂肪酸为储能基元材料,硅藻土为储能载体,基于真空吸附法制备了CA-MA/硅藻土定形相变储能材料.采用FT-IR、SEM、DSC、TG对定形相变材料的结构、形貌和热性能等进行了分析.结果表明,CA-MA二元低共熔脂肪酸被吸附到硅藻土的孔道中,二者之间为物理结合.质量分数为45％CA-MA的定形相变材料,CA-MA在反复循环相变中未发生泄漏,其熔化、凝固相变温度分别为22.75、14.52℃,相变焓分别为67.03、66.85J/g,相变温度适中,相变焓高,热稳定性好,适用于建筑领域.
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