Cellulose diacetate (CDA) based aerogels for thermal insulation were prepared by CDA cross-linked with 2, 4-toluene diisocyanate (TDI) in acetone solvent. The relationship between structure and thermal conductivity of CDA-based aerogels with various reactant ratios (CDA/TDI) was studied. The obtained results show that the increase of reactants causes higher bulk density and smaller porosity of as-prepared aerogels, while its specific surface area decreases with CDA content increasing. Thermal conductivity increases with CDA content increasing, and the minimal value is 0.0313 W m⁻¹ K⁻¹ comparably to that of polyimide aerogel at the same environmental conditions. Meanwhile, the radiant thermal conductivities of CDA-based aerogels were calculated in the range of 0.0021–0.0054 W m⁻¹ K⁻¹ superior to other cellulose aerogels using wafer method. Moreover, the analyses for thermal conductivity distributions of above aerogels suggest that the solid thermal conductivity proportion increases with reactant content increasing, the gaseous one falls down, and the radiant one changes hardly.

通过在丙酮溶剂中与2，4-甲苯二异氰酸酯（TDI）交联的CDA制备用于隔热的纤维素二乙酸酯（CDA）气凝胶。研究了具有不同反应物比率（CDA / TDI）的基于CDA的气凝胶的结构与导热率之间的关系。所得结果表明，反应物的增加导致所制备气凝胶的更高的堆积密度和较小的孔隙率，而其比表面积随CDA含量的增加而减小。在相同的环境条件下，热导率随CDA含量的增加而增加，其最小值为0.0313 W m ^-1  K ^-1。同时，基于CDA的气凝胶的辐射热导率计算为0.0021–0.0054 W m^-1  K ^-1优于使用晶片法的其他纤维素气凝胶。此外，对上述气凝胶的热导率分布的分析表明，固体热导率比例随反应物含量的增加而增加，气态的热导率下降，而辐射的几乎不变。