Cross-linked polymeric gels or films are prepared by dissolving in a suitable solvent a linear polymer or polymers at least one of which is predominantly (at least 80%) made from monomers containing pendant amidocarbonyl or oxycarbonyl groups. For the cross-linking reaction are present either hydroxyl groups, present as either pendant groups from the polymer, or as low molecular weight polyols; or amino groups, present as either pendant groups from the polymer, or as low molecular weight diamines or polyamines. Either no catalyst is present or a strongly acidic catalyst (which may also be a pendant group on a polymer) is used. The solvent is removed by coagulation and/or drying and the dry material is heat-cured, thus cross-linking and insolubilizing the polymer or polymers.
交联聚合物凝胶或薄膜的制备方法是将一种或多种线性聚合物溶解在适当的溶 剂中,其中至少有一种聚合物主要(至少 80%)是由含有
氨基羰基或氧羰基的单体制 成的。在进行交联反应时,可使用羟基(以聚合物的悬垂基团或低分子量多元醇的形式存在)或
氨基(以聚合物的悬垂基团或低分子量二胺或
多胺的形式存在)。或者不使用催化剂,或者使用强酸性催化剂(也可以是聚合物上的悬垂基团)。通过凝结和/或干燥去除溶剂,然后对干燥材料进行热固化,从而使聚合物交联和不溶解。