超细高强PAN基碳纤维原丝纺丝液研究

Study on spinning solution of super-fine and high-strength PAN-based carbon fiber precursor

聚丙烯腈的分子量越大,越有助于碳纤维超细高强高模化,但是由于纺丝液黏度急剧增大,以至于无法湿法纺丝,为解决这个问题,加入少量水来降低纺丝液的黏度。研究发现,高分子量聚丙烯腈-二甲基亚砜溶液中当水含量在1.5%～2%时,溶液黏度变得最低,且使纤维凝固成型缓和,结构均匀;同时还发现溶液粘度随温度升高而减小,当温度在65～80℃,PAN质量分数在10%～11%时,溶液粘度可控制在160Pa.S以下,能满足湿法纺丝的要求。通过湿法纺丝试验,得到强度达1GPa的原丝。

the higher molecular weight of polyacrylonitrile（PAN）,the higher strength and higher modulus of super-fine PAN-based carbon fiber.With the molecular weight increasing the viscosity of spinning solution increased so sharply that the spinning can almost not be done.In order to solve this problem,a little water was added into solution to reduce the viscosity of the spinning solution.Study found that the solution viscosity reached the minimum（and to ease fiber coagulation,homogeneous）when the number of water content was 1.5%～2% in high molecular weight PAN-DMSO solution,which made fiber shape form slowly with uniform structure.Futhermore,the viscosity was larger when the temperature was increase.When the temperature was 65～80℃ and the mass fraction of PAN was 10%～11%,the solution viscosity can be controlled in the range 160Pa·S,which can meet the technological requirements of wet spinning.PAN precursor has been produced with intensity up to 1GPa by wet spinning experiments.