Abstract
The comparison study of segmental mobility in the near-surface layers and in the bulk of polyethylene of various , crystallized under different conditions, was carried out with the help of plasma-induced thermoluminescent and radiothermoluminescent methods, differential scanning calorimetry, dynamic mechanical analysis, and wide angles X-ray scattering. The morphology was investigated by scanning and transmission electron microscopy. The samples were quenched from the melt or isothermally crystallized during 6 h at 125°C. It was found that the defreezing temperature of segmental mobility in the near-surface layers of high density polyethylene crystallized from quiescent melts was less than in the bulk by 60 K. Quite to the contrary, the segmental mobility in the near-surface layers of ultrahigh molecular weight polyethylene nascent particles that crystallize during synthesis in confinement conditions is hindered as compared with that in the bulk. The reason for the observed difference is discussed.
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