Investigation of the cyclization mechanism of poly(acrylonitrile-co-ethylenesulfonic acid) copolymer during thermal oxidative stabilization by in-situ infrared spectroscopy

Cyclization reaction is a crucial step during heat treatment process of polyacrylonitrile (PAN)-based carbon fibers (CFs). In this work, in-situ infrared spectroscopy and two-dimensional (2D) corre...