Two different PAN precursors with various comonomers were wet-spun.The properties and struc tural changes of PAN precursors and their evolution during preoxidation and carbonization process were characterized by the use of DSC, FTIR and traditional parameters, e g, tensile strength.It is demonstrated that acrylamide( AAM) is very effective to make the DSC peak be separated compared to methyl acrylate( MA ).As a result,carbon fibers developed from AAM-contained precursors have a better tetacity compared to those developed from MAcontained ones.
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