有机/无机杂化超轻质植物纤维发泡材料的表征和热稳定性

Study on the characterization and thermostability of foam materials of organic-inorganic hybrid ultra-low density wood fiber

通过FTIR、SEM-EDX分析表明:利用溶胶一凝胶法制备聚硅酸硫酸铝(PASS),其羟基化铝/硅的化合物(预聚体),经过水解缩合反应得到高度交联的PASS。在这一过程中,在纤维素、聚丙烯酰胺、聚乙烯醇等有机组分的存在,其高分子主链上的羟基、酰胺基、醚基可以与聚硅酸硫酸铝分子结构中的不饱和残键和不同状态的羟基发生一定的相互作用和键合作用,形成有机-无机杂化复合体(OIHC)。同时,OIHC通过扩散和渗透,又与木材细胞壁中的纤维、半纤维、木素进行杂化复合。OIHC的存在可有效保护纤维素,延缓热降解,使材料获得更加良好的热稳定性。

The analysis of FTIR and SEM-EDX shows that ：by the method of sol-gel, Polyaluminum silicate sulfate（PASS） was prepared and its hydroxylation aluminum/silicon compounds（prepolymer） became highly crosslinked PASS after the hydrolytic condensation reaction. In this process, hydroxyl, amide and ether on the main chain of the polymers which existed in cellulose, polyacrylamide and polyvinyl alcohol can interact with unsaturated residue bonds and the different state of hydroxyl resided in the structure of PASS and form Organic-inorganic hybrid complex （OIHC）. Meanwhile the OIHC can hybrid composite with celluloses, hemicelluloses and lignin by diffusion and infiltration. The existence of OIHC can effectively protect wood fiber and delay the thermal degradation and get a better thermal stability.