Real-time WAXD, SAXS, and SALS studies of the crystallization of polyethylene blends
- Univ. of Massachusetts, Amherst, MA (United States)
The crystallization of blends of linear polyethylene (HDPE) with linear low density polyethylene (LLDPE) has previously been studied using DSC and small-angle light scattering (SALS). The present study extends this work through simultaneous observations in real time of wide angle x-ray diffraction (WAXD), small-angle x-ray scattering (SAXS) and SALS using the DESY synchrotron facilities at Hamburg. Degrees of crystallinity are characterized by the WAXD, lamellar spacings by the SAXS, and superstructure by the SALS. The results are consistent with the previously proposed mechanism of the initial crystallization of the HDPE followed by a secondary crystallization of the LLDPE within the superstructure resulting from the initial crystallization. A comparison of the WAXD and the SALS reveals that the crystals of this LLDPE are less ordered within the spherulites are lessordered than those of the HDPE so that the increase in spherulite anisotropy and consequent increase in H{sub v} SALS intensity is less than expected on the basis of the increase in the degree of crystallinity.
- OSTI ID:
- 126928
- Report Number(s):
- CONF-950402--
- Country of Publication:
- United States
- Language:
- English
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