热固型酚醛树脂、蜜胺、间甲酚和甲醛水溶液在碳酸钠催化下,经溶液-溶胶-凝胶过程合成了有机水凝胶,有机水凝胶经溶剂置换和超临界干燥形成了有机气凝胶.研究了裂解条件、固形物浓度、蜜胺/酚醛树脂比和间甲酚/酚醛树脂比对有机气凝胶纳米孔在裂解过程中稳定性的影响.结果表明:在相同的反应物配比下,随裂解温度的升高和时间的延长,气凝胶纳米骨架烧结程度增加,炭气凝胶的中孔分布向小孔方向移动.在酚醛树脂浓度为7.5g/100mL时,有机气凝胶的纳米骨架稳定性好,耐烧结性能好.在蜜胺/酚醛树脂比大或间甲酚/酚醛树脂比小时,有机气凝胶的纳米骨架的稳定性和耐烧结性好.这是由于构成有机气凝胶中孔的纳米骨架稳定性与其连续性及分子间作用力有关.
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