Application of one-dimensional pspc to two-dimensional mapping of saxs intensity. i. changes of four-point saxs patterns of uhmwpe during heating

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Abstract
A new system utilizing a one-dimensional PSPC was developed for measuring two-dimensional SAXS intensity distribution. It was very effective for the measurement of a four-point SAXS pattern and was applied to pursue the change in the superstructure of ultra-high molecular weight polyethylene (UHMWPE) during heating. With increase of temperature up to the melting peak temperature, the long spacing and the intensity maximum increase and the regularity of lamellar stacking becomes better whereas the inclination of stacked lamellar interfaces remains constant. Beyond the melting peak temperature, the long spacing disappears but, at the same time, a maximum on the equator attributed to retention of the fibrillar structure clearly appears in spite of the molten state.