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Measurements have been made of the anisotropy of viscoelastic behavior in specially oriented sheets of low‐density polyethylene. The results for the cold‐drawn sheets show a β relaxation process of very characteristic anisotropy. The annealed sheets show two relaxations in this region of temperature. The lower relaxation (about −10°C) is identified as an interlamellar shear process. The higher relaxation (about 70°C) has a very similar anisotropy to the β relaxation in cold‐drawn samples. Isotropic sheets of low‐density polyethylene have been also investigated. Two β relaxations are found in these materials.
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Stachurski et al. (1968) studied this question.
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