Development of Porous Polyacrylonitrile Composite Fibers: New Precursor Fibers with High Thermal Stability oleh Ehsan Samimi-Sohrforozani, Sara Azimi, Alireza Abolhasani, Samira Malekian, Shahram Arbab, Mahmoud Zendehdel, Mohammad Mahdi Abolhasani, Narges Yaghoobi Nia