DETERMINATION OF PARAMETERS OF CRAZE FIBR ILS IN THE SOLVENT-CRAZED POLYMERS BY DATA OF SMALL-ANGLE X-RAY-SCATTERING

The draw ratio and the density of polymeric material in craze fibrils can be evaluated using the small-angle X-ray scattering data obtained for only two solvent-crazed samples, in one of which the initial liqui d in crazes is substituted by another liquid with differing electron d ensity. This approach was shown to be valid when this substitution was not accompanied by any changes in the volume fraction of craze fibril s in crazes and in the density of polymer material in fibrils. This me thod may be used as a sensitive tool to detect a difference between th e craze structure of various solvent-crazed samples. The conditions fo r preparation of the test samples and X-ray examination are discussed.