摘要
用气压式毛细管流变仪研究了高温法二醋酸纤维素（ＨＴＣＡ）—丙酮纺丝溶液的非牛顿指数ｎ，结构粘度指数△η和粘液活化能△Ｅη与可纺性的关系．结果表明，ｎ值的增大和△η的减小有利于改善ＨＴＣＡ—丙酮溶液的可纺性，但难以作为可纺与不可纺的判据．而△Ｅη能较好地表征ＨＵＣＡ—丙酮溶液的可纺性，△Ｅη值越高．流动性和可纺性越差，实验表明△Ｅη高于８０ＫＪ／ｍｏｌ时．其溶液不可纺．在ＨＴＣＡ—丙酮溶液中加入１０—１５％左右的助溶剂Ｄ，可提高丙酮的溶解能力，使ｎ值增大，△η和△Ｅη降低，从而改善了可纺性。
The relation between non-Newtonian exponent (n), structural viscosity indes (△η), the activation energy of the viscous flow (△η) and spinnability of acetone solution of cellulose acetate made by high temperature method (HTCA) were studied by the vapour-pressure type of capillary rheometer. The results show that the increase of n value and decrease of △η can improve the spinnability of HTCA-acetone, but it is difficult to use them as the criterion of opinnable or unspinnable. △η can be used as the Characteristic parameters of the spinnability of HTCA-acetone solutions and the higher the value of △η of the solution is, the worse its spinnability is. When △η>80 KJmol, the spinnability of HTCA-acetone solutions is poor. The effects of latent solvent on the spinnability were also studied. It has been found that latent solvent D can enhance the dissolving capacity, increase n and decrease △η and △Eη,and improve the opinnability when 10-15% of it is added into HTCA-acetone solution.
出处
《广东化纤》
1996年第3期1-5,共5页
Guangdong Chemical Fiber
