Radiation-induced crosslinking: II. Effect on the crystalline and amorphous densities of polyethylene |
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| Authors: | C. J. Chen D. C. Boose G. S. Y. Yeh |
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| Affiliation: | (1) Present address: Departments of Chemical Engineering and Materials Engineering, Macromolecular Research Center, University of Michigan, 48109 Ann Arbor, Michigan, USA |
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| 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,  c and a, were calculated after direct determination of the mean square density fluctuation < 2>. 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.Dedicated to Prof. Dr. W. Pechhold on the occasion of his 60th birthday. |
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| Keywords: | Crosslinking radiation polyethylene density crystallinity d-spacings phase densities crosslink locations and mechanisms defects lateral grain boundaries |
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