Abstract
Small-angle x-ray scattering (SAXS) was used to determine the structural changes in polyethylene induced by radiation. The changes in densities of the crystalline and amorphous phases, ρ c and ρ a , were calculated after direct determination of the mean square density fluctuation <η2>. ρ a increases with increasing radiation dose for both linear and branched polyethylene. This accounts for the serious discrepancy between crystallinities determined from wide-angle x-ray scattering and density measurements. This study confirms our previous proposal that crosslinks occur primarily in the noncrystalline phase, most likely at the defects in the lateral grain boundary regions.
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Dedicated to Prof. Dr. W. Pechhold on the occasion of his 60th birthday.
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Chen, C.J., Boose, D.C. & Yeh, G.S.Y. Radiation-induced crosslinking: II. Effect on the crystalline and amorphous densities of polyethylene. Colloid Polym Sci 269, 469–476 (1991). https://doi.org/10.1007/BF00655884
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DOI: https://doi.org/10.1007/BF00655884