Abstract
Texture and properties of fibers prepared from polyacrylonitric (PAN)/poly(p-phenylene terphthalamide)(PPTA) molecular composites were studied. Electron microscopy revealed that microfibrils of PPTA were oriented along fiber axis. The orientation developed during processing is very similar to those of short fiber reinforced polymer composites. Tensile modulus and strength increased markedly with increasing PPTA content in PAN/PPTA fiber up to 1.5wt%. Higher values of tensile modulus and strength may be due to the fineness and orientation of microfibrils. Maximum tan$\delta$ peak was shifted to higher temperature and decreased in intensity as PPTA content increased in the PAN/PPTA system. The absolute value of birefrigence increased with increasing PPTA content in PAN/PPTA fiber. Surface static charge of PAN/PPTA fibers was lower than that of PAN. This may be due to the existence of Na＋ ion included during blending of PAN and PPTA solution.
