聚丙烯腈纤维在水浴牵伸过程中应力-应变曲线的研究

Abstract: Stress-strain curves of PAN fibers during drawing in hot water were investigated at different temperatures and drawing velocities. Comparisons of drawing in water and in air were also performed. Results show that the stress-stain curves indicate necking when the fibers are drawn below 70℃ and are typical rubber-like when the fibers are drawn above 80℃. The fibers are easily broken when the temperature is too low or the drawing velocity is too high, with optimum temperatures and drawing velocities above 60℃ and between 200 and 500mm/min respectively. The drawing of PAN fibers in water is better than in air because it gives larger elongations without fracture.