FLEXIBLE POLYMER ELEMENT AS AN ENDURING AGENT IN PRE-PREGNATIONS.

摘要

A support structure comprising a flexible polymeric element in combination with reinforcing fibers for use in a curable composition with a resin matrix component in which the flexible polymeric element is in solid phase and is adapted to undergo a phase transition to the less partial to fluid phase, by dissolution during contact with the resin matrix component of the curable composition in which the polymer is soluble at a temperature that is lower than the temperature for the substantial onset of gelation and / or cure of the curable composition, characterized in that the transition from phase to fluid phase is by dissolving the soluble polymer in the resin matrix component, in which the matrix resin is curable and is selected from the group consisting of an epoxy resin, a resin addition-polymerization, especially a bis-maleimide resin, a formaldehyde condensate resin, especially a formaldehyde-phenol resin, a cyanate resin, an isocyanate resin, a phenolic resin and mixtures of two or more of the foregoing, and in which the flexible polymeric element comprises at least one polyaromatic sulfone comprising joined repeating units by ether, which optionally further comprise repeat units linked by thioether, the units consisting of - (PhAPh) n- and - (Ph) a- in which A = CO or SO2, Ph is phenylene, n = 1 a 2 and can be fractional, a = 1 to 4, preferably a = 1, 2 or 3 and, can be fractional and when it exceeds 1, said phenylenes are linearly linked through a single chemical bond or a divalent group other than CO- or -SO2- or are fused together directly or through a cyclic moiety, such as an alkyl acid group, an aromatic or cyclic (hetero) ketone, an amide, imide, imine; and in which the flexible polymeric element is in the form of a mono or multifiber, filament, tape, or mixtures or ligaments thereof.