Summary
New small angle X-ray diffraction data of a series of mostly low density PE samples isothermally crystallized from the melt are reported to discern between the existing ambiguities concerning the alternative of one or two lamellar periodicities. The ratio of X-ray spacings turns out to be dependent on the supercooling of the samples. This result together with the analysis of the 1st and 2nd diffraction peaks during and after heat treatments reveals that the two scattering maxima in the samples investigated most probably originate from the coexistence of two different lamellar periodicities.
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Martinez Salazar, J., Baltá Calleja, F.J. Long periods in melt crystallized polyethylene two coexisting structures?. Polymer Bulletin 3, 7–12 (1980). https://doi.org/10.1007/BF00263199
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DOI: https://doi.org/10.1007/BF00263199