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摘要: 主要考察了聚丙烯腈纤维在水浴牵伸过程中的应力-应变曲线，以及温度、牵伸速率、水分对应力-应变曲线的影响。结果表明：聚丙烯腈纤维在水温为室温（26℃）、30℃～70℃时属于细颈牵伸，在80℃、90℃时是类橡胶牵伸，当水温低于60℃和牵伸速率太快时纤维易产生毛丝。所以在牵伸过程中，水温不能低于60℃，牵伸速率要适中，在本实验条件下，200mm/min、500mm/min比较合适，而且在水中牵伸比在空气中牵伸效果好，可获得较大的牵伸率。Abstract: 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.
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