| abstract |
The present invention provides a method for curing a resin comprising unreacted phenolic OH groups and bisoxazoline monomers in the absence of a catalyst effective to promote curing, the method comprising exposing the resin to an electromagnetic field comprising a voltage, a frequency, and a wattage sufficient to maximize and to produce substantially uniform heating throughout the resin, wherein said curing opens a number of oxazoline rings sufficient to create cross-linking which produces a rigid polymer composition. A preferred mechanism for curing is by pultrusion. In a preferred method, the resin is mixed before curing with an antioxidant selected from the group consisting of 2,4,8,10-tetraoxa-3,9,diphosphaspiro[5,5]undecane, 3,9-bis[2,4-bis(1,1-dimethylethyl)phenoxy]- and an acetone-diphenyl amine condensate product. |