Studies on the Infrared Spectral Behavior of Ultra-high Molecular Weight Polyethylene

Abstract

Abstract: The change of infrared spectral behavior of ultra-high molecular weight polyethylene (M_w>10×10⁵) with temperature was studied.It was found that the absorption strengthes of three bands (1368, 1352.and 1304 cm^-1) arised from amorphous regions were increased with increasing temperature, but the increasements were less than those of the conventional molecular weight polyethylene (M_w= 10×10⁴), especially in the case of temperature range higher than 140℃.The change of short-range conformation distributions of methylenes in molecules with temperature was independent of molecular weight while the gauche conformation distribution of methylenes was increased with the increase of temperature.Both the spectral results obtained in heating and cooling processes showed that the bands of 1352 and 1304 cm^-1 were more sensitive to the change of the state of the crystalline phase than the band of 1368 cm^-1.

Key words: Polyethylene, Ultra-high molecular weight polyethylene, Infrared spectrum

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LIAO Kai-Rong. Studies on the Infrared Spectral Behavior of Ultra-high Molecular Weight Polyethylene[J]. Chem. J. Chinese Universities, 1993, 14(12): 1748.

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Studies on the Infrared Spectral Behavior of Ultra-high Molecular Weight Polyethylene

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