Characterization of polyethylenes by x‐ray diffraction and <sup>13</sup>C‐NMR: Temperature studies and the nature of the amorphous halo

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<jats:title>Abstract</jats:title><jats:p>X‐ray diffraction patterns of linear and branched polyethylenes typically show two sharp reflections and an amorphous halo. The position of the halo depends on branch content and temperature. A single curve describes the position of the halo maximum (2θ<jats:sub>halo</jats:sub>) for a range of liquid hydrocarbons and polyethylenes in the 20–140°C range. At temperatures well below their melting point, branched polymers give 2θ<jats:sub>halo</jats:sub> values which differ significantly from those observed for the liquid Linear polymers show a greater divergence, indicating that some of the material giving rise to the halo is much better packed than in the liquid.Parallel <jats:sup>13</jats:sup> C NMR spin‐lattice relaxation studies suggest that this relatively ordered material has a trans conformation but a low average T<jats:sub>1c</jats:sub> value. © 1993 John Wiley & Sons, Inc.</jats:p>

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