Determination of matrix crystallinity of composites by X‐ray diffraction

Abstract Determination of the degree of crystallinity of the matrix of polymer matrix composites by wide‐angle X‐ray diffraction is discussed. An extensive theoretical review is given, and many of the practical difficulties are also discussed. Poly(aryl ether ether ketone)‐carbon fiber composites are used as example materials. It is shown that although wide‐angle X‐ray diffraction is potentially useful for unoriented samples, there are practical and theoretical difficulties in applying the technique to highly oriented materials.