Assignment of a characteristics infrared absorption band at 810cm-1 in heat-treated polyacrylonitrile.

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概要

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• When polyacrylonitrile (PAN) was heat-treated at about 250 °C under nitrogen, a violent exothermic reaction took place. PAN lost weight and the infrared absorption at 2240 cm<SUP>−1</SUP> disappeared, but there was little change in the atomic ratios of carbon, hydrogen, and nitrogen. This indicates that fragmentation is accompanied by rapid polymerization of cyano groups. The sample obtained after the completion of the exothermic reaction seems to be liable to oxidation, because a strong exothermic reaction and weight gain occur immediately if air is admitted to enter. During the oxidation the percentages of carbon and nitrogen did not change, but that of hydrogen largely decreased, indicating the occurrence of oxidation and subsequent dehydration in the moieties subjected to polymerization of cyano groups. Therefore, the tri-substituted carbon-carbon double bonds are formed in the six-membered ring systems. A new infrared absorption band which appears at 810 cm<SUP>−1</SUP> is assigned to the C–H out-of-plane bending vibration in such a double bond.

• 公益社団法人 日本化学会の論文

著者

• Okamoto Masao

  Department of Fiber and Polymer Engineering, Faculty of Engineering, Yamagata University

関連論文

• Assignment of a characteristics infrared absorption band at 810cm-1 in heat-treated polyacrylonitrile.
• Bulk copolymerization of acrylonitrile with .ALPHA.-chloroacrylonitrile.

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