三聚氰胺-甲醛气凝胶模板的结构与热稳定性

Structure and thermal stability of melamine-formaldehyde aerogel template

采用溶胶-凝胶法合成出三聚氰胺-甲醛(MF)有机气凝胶,并通过N2吸附、红外光谱以及热重-质谱联用等实验技术对该气凝胶的多孔形态、结构特性和热稳定性进行了表征。结果表明:MF气凝胶是一种连续的、相互贯通的3维多孔网络结构材料,比表面积约842m2/g,平均孔径为16nm左右;热解产生了NO,H2O,NH3,NO2,CO2和CH4气体,很好地诠释了各阶段失重,其总失重高达97%,有望作为制备3维nm级多孔材料的模板。

Organic aerogels were fabricated by sol gel polymerization of melamine and formaldehyde monomers. The porous morphology, structure and thermal stability of the aerogels were characterized by nitrogen adsorption, Fourier transform infrared spectroscopy（FTIR） and thermogravimetry-mass spectrometry（TG MS）. The results show that melamine（M） formaldehyde（F） aerogel is a material of continuous, interpenetrant, three-dimensional network structure with a high surface area, whose corre- sponding specific surface is roughly 842 m^2/g, and average pore size is 16.04 nm. The pyrolysis process releases several gaseous products, including NO, H2O, NHa, NO2, CO2 and CH4, which is conformed with TG curves, and nearly 97% of MF is decom posed in all. The aerogel is expected to be employed as the template to obtain three dimensional nanoporous materials.