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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 greater the molecular weight of polyacrylonitrile, the more contribute to the ultra-fine high-strength carbon fiber mold, but because of the sharp increase in the viscosity of the spinning solution, so that wet spinning can not solve this problem, add a small amount of water to reduce spinning Liquid viscosity. The results showed that when the water content is 1.5% ~ 2%, the solution viscosity becomes the lowest and the fiber coagulation moderation and structure are homogenous. The viscosity of the solution with the temperature When the temperature is 65 ~ 80 ℃, PAN mass fraction is 10% ~ 11%, the solution viscosity can be controlled below 160Pa.S, which can meet the requirements of wet spinning. By wet spinning test, the strength of up to 1GPa of the original yarn.