PDA改性纤维素基复合相变材料的制备及其性能

PDA-modified cellulose-based composite phase change materials preparation and properties

摘要:

将多巴胺（DA）分别在空气和TEMPO条件下自聚合形成A-PDA和T-PDA，分别与羧甲基纤维素钠（CMC）混合以香草醛为交联剂制备CA-P和CT-P气凝胶，真空浸渍PEG2000获得复合相变材料。采用SEM、FTIR、DSC、TG和红外热成像仪等对气凝胶的微观形貌、化学结构、热稳定性和光热转换性能进行表征和分析。结果表明，CMC、CA-P和CT-P气凝胶对PEG2000均有良好的封装稳定性。PDA的加入使复合相变材料的光热转化效率提高，其中PEG/CA-P达到51.75%，而PEG/CT-P高达76.27%；与PEG/CMC和PEG/CA-P相比，PEG/CT-P复合材料相变焓值更接近纯PEG2000，约为其97%，储能效果更佳。制备的三种复合相变材料均表现出优良的循环稳定性。

Abstract:

Dopamine (DA) was self-polymerized under air and TEMPO conditions to form A-PDA and T-PDA, respectively, and mixed with sodium carboxymethyl cellulose (CMC), respectively, and vanillin was used as a cross-linking agent to prepare CA-P and CT-P aerogels, and composite phase change materials were obtained PEG2000 vacuum impregnation. SEM, FTIR, DSC, TG and infrared thermal imagers were used to characterize and analyze the microscopic morphology, chemical structure, thermal stability and photothermal conversion performance of aerogels. The results showed that CMC, CA-P and CT-P aerogels had good encapsulation stability against PEG2000. The addition of PDA improved the photothermal conversion efficiency of the composite phase change materials, in which PEG/CA-P reached 51.75%, while PEG/CT-P reached 76.27%. Compared with PEG/CMC and PEG/CA-P, the enthalpy of phase change of PEG/CT-P composites is closer to that of pure PEG2000, about 97%,and the energy storage effect is better. The three composite phase change materials exhibited excellent cycling stability.