Modification of polyacrylonitrile (PAN) carbon fiber precursor via post-spinning plasticization and stretching in dimethyl formamide (DMF)

This study investigates the possibility of using a post-spinning plasticization and stretching process to eliminate suspected property-limiting factors in polyacrylonitrile-based carbon fibers

J.C Chen; I.R Harrison

2002

Scholarcy highlights

  • This study investigates the possibility of using a post-spinning plasticization and stretching process to eliminate suspected property-limiting factors in polyacrylonitrile-based carbon fibers
  • This process was performed with the intention of removing surface defects, attenuating fiber diameter, and reducing molecular dipole interactions
  • Tested individually, fibers exposed to 80% dimethyl formamide for 10 s gave the highest precursor values of elastic modulus and tensile strength
  • While fibers treated in 80% DMF gave a 73% improvement in elastic modulus and a 53% improvement in tensile strength over as-received PAN, limitations in sample preparation and carbonization necessitated a reduction in DMF concentration to allow extraction of individual carbon fibers for tensile testing
  • Results for fibers carbonized at 1000°C showed a 32% improvement in carbon fiber elastic modulus and a 14% improvement in carbon fiber tensile strength over regularly prepared carbon fibers. These results show that, to a certain extent, improvements in PAN precursor properties can translate to corresponding improvements in subsequently produced carbon fibers
  • Additional characterization using wide angle X-ray scattering and scanning electron microscopy suggests that these improvements are due in part to improved lateral order as well as the successful elimination of surface defects and prevention of skin-core formation

Need more features? Save interactive summary cards to your Scholarcy Library.