Anelastic Deformation of a Thermoplastic-Matrix Fiber Composite at Elevated Temperature; Part 1: Neat Resin Structure Characterization.

摘要

This, the first of a series of papers on the properties of a thermoplastic polyamide matrix (poly (bis 4-4' dicyclohexylmethane) n-dodecane-diamide)/graphite fiber composite, describes the structural characterization of the neat resin by differential scanning calorimetry (DSC) and x ray diffraction as a function of processing history. The representative thermoplastic matrix polymer for advanced composite is partially crystalline (ca. 20%) under normal composite processing conditions, but can be quenched to a completely amorphous state. The complex DSC results are shown to result, at least in part, from the presence of a different crystal structure in slow cooled matrix than in quenched, annealed or fiber samples, to a melting-recrystallization - melting process during heating and to the effect of heating rate.