双醛羧甲基纤维素改性胶原气凝胶复合相变材料的制备及性能

Preparation and properties of dialdehyde carboxymethyl cellulose modified collagen aerogel composite phase change material

摘要:

以制革固体废弃物中提取的胶原为原料、双醛羧甲基纤维素（DCMC）为大分子交联剂，通过冷冻干燥技术制备了DCMC改性胶原气凝胶，利用FTIR和SEM对其结构和形貌进行了表征。结果表明，DCMC的引入不会改变胶原三股螺旋结构，且制得的DCMC改性胶原气凝胶具有丰富的多孔结构、低密度（8.83~10.38mg/cm3）、高孔隙率（94.99~97.65%）和良好隔热性能。当DCMC含量小于15%时，DCMC改性胶原气凝胶的压缩应力随DCMC含量的增加而变大。此外，为进一步提升DCMC改性胶原气凝胶的隔热性能和耐久性，通过真空浸渍法填充相变材料和浸涂法疏水处理，制备出DCMC改性胶原气凝胶复合相变材料。隔热实验、泄露实验和防污实验等实验结果表明，气凝胶复合相变材料相比于气凝胶具有更加优异的隔热效果，拓展了其实际应用范围。

Abstract:

Dialdehyde carboxymethyl cellulose (DCMC) modified collagen aerogel was prepared by freeze-drying technology using collagen extracted from tannery solid waste as raw material and DCMC as macromolecular cross-linking agent, and its morphology and structure were characterized by FTIR and SEM. The results showed that the introduction of DCMC didn’t change the triple helix structure of collagen, and the prepared DCMC modified collagen aerogel had rich porous structure, low density (8.83~10.38mg/cm3), and high porosity (94.99~97.65%) and good heat insulation performance. When the DCMC content was less than 15%, the compressive stress of the DCMC modified collagen aerogel increased with the increase of DCMC content. In addition, in order to further improve the thermal insulation performance and durability of DCMC modified collagen aerogels, the phase change materials were filled by vacuum impregnation and the hydrophobic coating was coated to prepare the DCMC modified collagen aerogel composite phase change materials.The experimental results of heat insulation, leakage and antifouling experiments showed that the aerogel composite phase change material has more excellent heat insulation effect than the aerogel, which expands its practical application range.