Effects of oxygen on the structural evolution of polyacrylonitrile fibers during rapid thermal treatment.

ABSTRACT: In this study, the mechanism of stabilizing polyacrylonitrile (PAN) fibers in a short period of time is investigated through probing the effects of oxygen on the structural evolution of PAN under different temperature regimes. It has been found that oxygen has a significant influence on both the chemical and physical structural evolution of PAN fibers, even in a short period of stabilization time, and the influences are dissimilar at different stabilization temperatures. At lower temperatures (below 140 °C), there is no noticeable change in the chemical and physical structures of the PAN fibers. In the mid-temperature range (140-200 °C), oxygen can slightly induce the cross-linking of PAN chains and result in a higher rate of decreasing crystallinity. When the main chemical reactions are i

SUBMITTER: Chen L 

PROVIDER: S-EPMC9049771 | biostudies-literature | 2020 Feb

REPOSITORIES: biostudies-literature