Crosslinked resins useful in phenolic resin containing fibers

摘要

The present invention is directed to a fiber having improved chemical, thermal and structural stability, comprising an inner core material such as polyacrylonitrile of a first surface tension and an outer clad such as a cyanate ester of a polyphenol of a second surface tension lower than the first surface tension such that the outer layer material adheringly surrounds the inner core material and is crosslinkable therewith, and where, in a preferred embodiment, the polyacrylonitrile and the cyanate ester crosslink to form triazine; and a method and compound for the same; a novel crosslinked phenolic resin is also described.