| 摘要 |
The invention relates to an unsaturated-epoxy moiety R-NHCO2-E wherein R is unsaturated and free of isocyanate functionality and E has an oxirane ring. The moiety may be dissolved in a liquid epoxy compound. The invention also relates to a mixture obtained by vinyl polymerization of the moiety and an added unsaturated compound in the liquid epoxy compound solution. Epoxy cross-linking then leads to a polymeric reaction product. Vinyl polymerization and epoxy curing can also be simultaneous. A polymeric material is formed by reacting an isocyanate compound having the formula R-NCO with an epoxy compound having the formula E-OH, where R and E are as defined above, to form the moiety R-NHCO2-E and polymerizing this moiety, along with an additional unsaturated compound under vinyl polymerization conditions and in the presence of a liquid epoxy compound, to form a copolymer of R-NHCO2-E with the additional unsaturated compound. Cured epoxy systems are provided of improved toughness and reduced brittleness. The viscosity of a liquid epoxy compound can be controlled to be as low as is necessary for filament winding and other operations through adding an additional unsaturated compound such as styrene while the cross-linking of the liquid epoxy compounds leads to the formation of a single phase polymer.
|
