This paper presented an investigation into the process technology of poly(p-phenylene terephth amide)(PPTA)composite with cellulose fiber paper. The medium molecular weight PPTA was dissolved in DMPU/LiCl and formulated into a stable solution,which was then scraped onto the surface of ordinary cellulose fiber paper by the scraping method at a constant speed. The resulting gel coating was treated with a solidifying bath and subsequently dried to obtain PPTA-coated cellulose fiber paper. The introduction of PPTA surface coating resulted in an improvement in the denseness and continuity of the cellulose fiber paper surface,thereby facilitating a strong interaction with the cellulose fiber paper. The tensile strength of the composite paper increased significantly when the PPTA content was approximately 5.7％. The tensile strength of the cellulose fiber paper was 25.6 MPa,while that of the composite paper was 79.7 MPa,with a 211％ increase. Similarly,the wet tensile strength increased from 0.134 kN/m to 0.731 kN/m,with a 446％ increase. Additionally,the tear degree increased from 316.3 mN to 662.3 mN,with a 109％ increase. Furthermore,the flame retardancy of the composite paper had increased significantly. It could self-extinguish within 3 when exposed to fire. Addi-tionally,the electric breakdown strength of the composite paper was 20.9 kV/mm,which was an 90％ increase compared to the original cellulose fiber paper.
维普
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