Abstract
Microstructure evolution of cellulose-based carbon fibers during the heat-treatment process of pyrolysis and carbonization was studied by Raman spectroscopy. The characteristic peaks of cellulose fibers were weakened after a dry process at 100°C and absolutely disappeared after the pyrolysis temperature reached 150°C. For intermediates obtained in the temperature of 150-1300°C, two characteristic Raman peaks appeared at ~1360cm-1 and ~1580cm-1, meaning a transition state structure of carbon hexagonal plane started to form. Parameters including ID1’/IG’, ID2’/IG’ and ID3’/IG’ of the intermediates treated in the temperature of 150-1300°C were compared. All the parameters firstly decreased with the increasing heat treatment temperature until a maximum at ~400°C,and then the parameters decreased until the structure turned into a carbon fiber structure at 1300°C.
