| Abstract:Para-aramid(para-phenylene terephthalamide) fibrid is a new type of aramid fiber, which is prepared by the method of precipitation. In order to reveal the relationship between the morphology of para-aramid and the structure and properties of the resultant sheet, the surface morphology of fibria was characterized by scanning electron microscopy, atomic force microscopy. The morphological parameters of the fiber were analyzed by fiber quality analyzer. The pore structure of PPTA paper-based material was investigated. And the effects of fibrid weight proportions in PPTA paper-based material were investigated. The results showed that para-aramid fibrids exhibited small sized pieces with wrinkled surface, and could be dispersed evenly in water. The surface of fibrids was rough. The fines content of the fibrids accounted for 71.9% and the weighted length was 0.479 mm, fibrid had a high degree of uniformity, which was beneficial to enhance the strength of paper. Moreover, fibrid weight proportions had a significant impact on the pore structure, mechanical properties and dielectric properties of PPTA paper-based material, and the proportions of fibrid should be controlled in around 70%. |
