Determination of the crystallinity degree of polymers by small angle X-ray scattering
Measurements of the crystallinity degree of semi-crystalline polymers by X-ray scattering method have been carried out. The suitability of SAXS-method has been established, in particular in relation to polymers for which it is impossible to obtain an exactly crystalline or an exactly amorphous standard. The small angle degree of crystallinity (Fs) has been determined for pure polyamide-6 and for several systems composed of PA-6 and poly(methacrylic acid) of varying composition by the SAXS method with the utilization of a correlation function. It has been fund that the Fs-values of all samples are lower than the walues of linear degree of crystallization these values being equal to the ratio of the thickness of crystalline lamellae to long period. The effect of the presence of poly(methacrylic acid) in the system on a decrease of degree of crystallinity of PA-6 has also been evaluated.
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