聚乙烯醇对制备A95多晶氧化铝纤维的影响

摘要

为了提高A95铝硅溶胶的成纤性,研究了不同质量分数和不同聚合度的聚乙烯醇(PVA)对铝硅溶胶成纤性的影响,测试了溶胶的黏度、流变性、微观组织结构、红外光谱、凝胶纤维的直径及分布范围和纤维体的BET比表面积及其孔径分布.结果表明,在没有任何成纤助剂的情况下,溶胶不具有成纤性;当w(PVA-2099)在1.0%～2.0%时,凝胶纤维细而均匀,渣球较少;当w(PVA-2099)为2.0%时,纤维的BET比表面积和吸附气体量达到最大;当w(PVA-2099)达到4.0%时,凝胶纤维较粗且不均匀,渣球较多.凝胶纤维的直径及其分布范围随着PVA聚合度的增大而增大,且当PVA的聚合度为1799和1899时,制得的凝胶纤维细而均匀.%In order to improve the fiberizability of A95 aluminum-silicon sol, the influence of polyvinyl alcohol with various mass fraction and polymerization degree on the fiberizability of aluminum-silicon sol was researched.The viscosity, rheological property, microstructure and infrared spectrum of the sol, the diameter and distribution scope of the gel fibers, as well as the BET specific surface area and pore diameter distribution of the fiber were measured.The results show that without any fiberizing agent, the gel has no fiberizability.When the mass fraction of PVA-2099 is in the range of 1.0％ to 2.0％, the produced gel fibers are thinner and uniform, and the slag is less.When the mass fraction of PVA-2099 is 2.0％, the BET specific surface area and gas volume adsorbed achieve the maximum values.However, when the mass fraction of PVA-2099 reaches 4.0％.the gel fibers are thicker and non-uniform, and the slag content is higher.With increasing the polymerization degree of PVA, the diameter and distribution scope of the gel fibers increase gradually.When the polymerization degrees of PVA are 1799 and 1899 respectively, the fabricated gel fibers are thin and uniform.