Abstract: In an infusibilized polyphenylene ether fiber of the present disclosure, an absorbance height ratio (A/B) between an absorbance height A at a wave number of 1694 cm?1 derived from C?O stretching vibration and an absorbance height B at a wave number of 1600 cm?1 derived from skeleton vibration due to carbon-carbon stretching of a benzene ring is 0.25 or more, and an absorbance height ratio (C/B) between an absorbance height C at a wave number of 1661 cm?1 derived from C?O stretching vibration and an absorbance height B at a wave number of 1600 cm?1 derived from skeleton vibration due to carbon-carbon stretching of a benzene ring is 0.75 or less, as measured by infrared spectroscopy.

Abstract: An object of the present invention is to provide a polyphenylene ether melt extrusion formed body which can be obtained by melt forming without mixing other resin components and has excellent properties such as mechanical strength, and a method for producing the same. The present invention relates to a polyphenylene ether melt extrusion formed body comprising a polyphenylene ether component which has a rearrangement structure having a continuous structure bonded at an ortho-position in a repeating unit continuously bonded at a para-position.