纤维素复合气凝胶的制备及保温隔热性能研究.

In this paper, a green carboxymethyl cellulose sodium (CMC)/gelatin (GL)-glut ar aldehyde (GA) composite aerogel (CL-A) was prepared by using the principle of chemical cross-linking and freeze-drying technology. The effects of different proportions of carboxymethyl cellulose sodium (CMC), gelatin (GL) and different contents of glutaraldehyde (GA) on the microstructure, thermal stability, mechanical strength and thermal insulation and thermal insulation properties of the aerogel were investigated. The experimental results obtained after trying different raw material ratios showed that the compression modulus of the composite aerogel (Cj I弋一Ain)with the ratio of sodium carboxymethyl cellulose (CMC) to gelatin (GL) of 1:2 and the addition of glutar-aldehyde (GA) of 15% is the highest of 3.()3 Mpa, which is 7 times higher than that of pure sodium carboxym-ethyl cellulose (CMC) aerogel, and the mechanical properties have been enhanced effectively. The thermal conductivity of composite aerogel (Ci I<_) is the lowest, which is as low as ().022 W/(m • k) with a better heat preservation effect. At the same time, the composite aerogel (Ci I-) has a denser porous three-dimensional network, which improves the morphology of the composite aerogel to a certain degree. Lastly, the composite aerogel (C J弋-八")has up to 37% residual carbon, which improves the thermal stability to some extent. Tn summary, the compression modulus, microstructure, thermal stability, and thermal insulation properties of the composite aerogel (C-! I<-AI5) after the addition of gelatin (GL) and glutaraldehyde (GA) are improved. [ABSTRACT FROM AUTHOR]