Hybrid epoxy-amine hydroxyurethane-grafted polymer - Статья

Hybrid epoxy-amine hydroxyurethane-grafted polymer O. Figovsky O. Birukov A. Leykin L. Shapovalov Preparing of polymers with a specific topological structure of polymerchains is a perspective way of creating materials with needed properties. Conventional epoxy-amine formulations are used as precursors for three-dimensional cross-linked networks [1, 2]. Thermoplastic resins based on epoxy and amine monomers are alsoknown in the art. For example, patent [3] discloses polymers based on diglycidyl ethers of polyhydric phenols and compounds such as alkanolamines and anilines having two amino hydrogen atoms per molecule.The process is carried out at extremely conditions: in a melt at a temperature of up to250oC. or in a solution at a temperature of up to 200oC. amine hydroxyurethane polymer leather Patents [4, 5] disclose thermoplastic polyetheramines (TPEA) having aromatic ether/amine repeating units in their backbones and pendant hydroxylmoieties. Such polyetheramines are prepared by reacting diglycidyl ethers of dihydricaromatic compounds such as the diglycidyl ether of bisphenol-A (DGEBA),hydroquinone, or resorcinol with amines having no more than two amine hydrogenatoms per molecule, such as piperazine, monoethanolamine (MEA), and mono-amine functionalized poly (alkylene oxide). These polyetheramines are thermoplastic polymers and have an improved barrier to oxygen and a relatively high flexuralstrength and modulus. The disadvantage of these products is that they can beprocessed or melted at temperatures of 150 to 200°C. by using only specialequipment, or solutions in high-boiling toxic solvents. It is known in the art to use hydroxyurethanes for improving some properties of thick cross-linked epoxy polymer networks. For example, patent [6] describes certain polyhydroxyurethane networks that are produced based on reactions between oligomers comprising terminalcyclocarbonate groups and oligomers comprising terminal primary amine groups. Oligomers comprising terminal cyclocarbonate groups are the products of epoxyresins reacting with carbon dioxide in the presence of a catalyst, the conversion ofepoxy groups into cyclocarbonate groups being 85 to 95%. Pat. Application [7] discloses a liquid cross-linkable oligomer composition thatcontains a hydroxyurethane-amine adduct and a liquid-reacting oligomer. Thehydroxyurethane-amine adduct is a product of an epoxy-amine adduct reacting with acompound having one or more terminal cyclocarbonate groups. Patent [8] describes amethod and an apparatus for synthesis of oligomeric cyclocarbonates and their use inmaking a star-shaped structure of the polymer network. Patent [9] discloses three-dimensionalepoxy-amine polymer networks modified by a hydroxyalkyl urethane,which is obtained as a result of a reaction between a primary amine (one equivalent ofthe primary amine groups) and a monocyclic carbonate (one equivalent of the cycliccarbonate groups).