| abstract |
Organic three-dimensional polymeric gel-like materials containing covalently bonded phosphoric acid or a derivative thereof and a method for their manufacture. The bonding is accomplished by the reaction of the free hydroxy or epoxide groups in the homogeneous or macroporous gel-like matrix with the H 3 PO 4 , P 2 O 5 , phosphorus pentahalide and oxyhalide. The halide containing groups may then be hydrolyzed to form acid groups which then may be modified to form complex compounds by reaction with Lewis acids. The gel material may serve as a strongly acidic cation exchanger, catalyst or polymer reagent. |