Abstract
Polymer networks are prepared by heat-curing of prepolymers containing cyclic ammonium cations with carboxylate-containing reagents as counter anion.A first part describes the cross-linking of copolymers of N-cyclohexyl-3-azetidinyl methacrylate (CHAM) and methyl methacrylate with hydrogen chloride or mono- or poly-carboxylic acids. Curing temperatures were between 90 and 140°C and curing times between 3 and 20min, depending on the CHAM-content and the type of acid used.In a second part, pyrrolidinium ion containing (co)polymers were reacted with carboxylate ion containing (co)polymers to form the corresponding inter polymer complexes (IPCs) which were subsequently heat-cured. The first was an IPC obtained by mixing the water-soluble (co)polymer of N,N-diallylpyrrolidinium chloride (DAPC) with sodium acrylate (co)polymer. Heating of the dry IPC film or powder resulted in ring-opening of the pyrrolidinium ions by the carboxylate ions leading to covalent networks. A second type of IPC was obtained by mixing copolymers of N-(vinyl benzyl)pyrrolidine (VBP) with acrylic acid copolymers. The thus obtained IPCs are transformed into covalent polymer networks by curing at 130°C. Also IPCs with different structural units (for ex. VBP-Styrene copolymer with acrylic acid-butyl acrylate copolymer) could be formed and cured leading to polymer-co-networks.
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