| 陈瑾轩,贺莹莹,陈港.高相变焓羧甲基化纤维素纤维-碳纳米管-石蜡相变复合材料的制备与储热性能研究[J].中国造纸,2025,44(7):53-63 |
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| 高相变焓羧甲基化纤维素纤维-碳纳米管-石蜡相变复合材料的制备与储热性能研究 |
| Preparation and Thermal Energy Storage Performance of High Thermal Energy Density MNCMF-CNT-PW Phase Change Composites |
| 收稿日期：2025-02-20 修订日期：2025-03-06 |
| DOI：10.11980/j.issn.0254-508X.2025.07.007 |
| 关键词: 石蜡 纤维素气凝胶 相变材料 热能存储 |
| Key Words:paraffin wax cellulose aerogel phase change material thermal energy storage |
| 基金项目:广东省自然科学基金项目（2021A1515010538）；制浆造纸工程国家重点实验室项目（2020ZD02）；国家重点研发计划（2018YFC1902102）。 |
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| 摘要:本研究采用真空浸渍法制备了高相变焓的羧甲基化纤维素纤维（CMF）-碳纳米管（CNT）-石蜡（PW）相变复合材料。首先，通过高速剪切使CMF部分纳米化得到MNCMF，制备了均匀分散的MNCMF-CNT水分散液。然后，通过冷冻干燥得到具有丰富孔隙结构的MNCMF-CNT气凝胶，且CNT均匀分布在孔壁表面。最后，以MNCMF-CNT气凝胶为载体，通过真空浸渍法将PW填充到其孔隙中，得到MNCMF-CNT-PW相变复合材料。结果表明，CNT的引入显著改善了相变复合材料的导热性能，使其热导率从0.283 W/(m·K)提高到了0.327 W/(m·K)。其中，由熔融温度52~54 ℃的石蜡制备的MNCMF-CNT2-PW52表现出高相变焓和优异的潜热保留率，其熔融焓和结晶焓分别为217.7和217.9 J/g，潜热保留率达到97.9%。此外，MNCMF-CNT2-PW52能够有效收集、存储和释放热能，与热电发电片结合后能稳定输出电能。 |
| Abstract:This study employed a vacuum impregnation method to prepare carboxymethylated cellulose fiber （CMF）-carbon nanotube （CNT）-paraffin wax （PW） composites with high phase change enthalpy. First， uniformly dispersed MNCMF-CNT aqueous solutions were prepared via high-speed shearing. Then， MNCMF-CNT aerogels with a porous structure were obtained by freeze-drying， with CNT uniformly distributed on the pore walls. Finally， the aerogels were vacuum-impregnated with PW， filling their pores and forming stable MNCMF-CNT-PW composites. The results showed that the incorporation of CNT improved the thermal conductivity of the phase change material from 0.283 to 0.327 W/(m·K). Additionally， MNCMF-CNT2-PW52 displayed high phase change enthalpy and latent heat retention， which made by paraffin wax with melting temperature of 52~54 ℃， with melting and crystallization enthalpies of 217.7 and 217.9 J/g， respectively， and a latent heat retention rate of 97.9%. Furthermore， MNCMF-CNT2-PW52 composites effectively collected， stored， and released thermal energy. When combined with a thermoelectric generator， they output electric energy consistently. |
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