摘要
采用一步水热还原法制备了多壁碳纳米管(MWCNTs)/还原氧化石墨烯(r GO)纳米杂化材料,进一步通过溶液混合方法将纳米杂化材料与氨纶混合制备了氨纶/MWCNTs/r GO(NCs)溶液,使用旋转流变仪研究了NCs溶液浓度和温度对其静、动态流变行为的影响。结果表明,高浓度的NCs溶液黏度对剪切速率较为敏感,产生明显的剪切变稀现象,但在低剪切速率下其黏度仍有较宽的稳定平台;随温度降低,浓度为10%的NCs溶液黏度升高,剪切变稀现象更为明显,当温度低于60℃时,黏度的稳定平台变窄;NCs溶液在角频率较低时具有较好的纺丝性能,角频率大于200 rad/s时,储能模量高于损耗模量,纺丝时容易造成出口胀大堵塞纺丝孔,对于纺丝不利;NCs溶液的非牛顿指数随着温度升高而升高,与剪切变稀随温度升高而减弱的现象一致。由静、动态流变测试结果综合分析,浓度为10%的NCs溶液适宜纺丝的温度应该大于60℃,剪切速率应低于20 s-1。
Multi-walled carbon nanotubes(MWCNTs)/reduced graphene oxide(rGO)nano-hybrid materials were prepared by one-step hydrothermal reduction method.The spandex/MWCNTs/rGO(NCs)solutions were further prepared by solution mixing method.The effects of solution concentration and temperature on the statics and dynamic rheological behaviors of the NCs solutions were investigated by rotating rheometer.The results show that the viscosity of NCs solution with high concentration is sensitive to shear rate and produces obvious shearing thinning phenomenon,however,at low shear rate,its viscosity still has a wide stable platform.With the decrease of temperature,the viscosity of NCs solution with 10%concentration increases,the shear thinning phenomenon is more obvious.When the temperature is lower than 60℃,the stable platform of viscosity becomes narrower and the NCs solution has better spinning performance when the angular frequency is lower.When the angular frequency is more than 200 rad/s,the storage modulus is higher than the loss modulus,which causes the die swell easily to block the spinning hole when spinning.The non-Newtonian exponent of NCs solution is increased with the increase of temperature,which is consistent with the phenomenon that shearing thinning decreases with the increase of temperature.According to the results of statics and dynamic rheological,the suitable spinning temperature of NCs solution with 10%concentration should be more than 60℃,and the shear rate should be lower than 20 s-1.
作者
孔庆宁
罗钟琳
王标兵
Kong Qingning;Luo Zhonglin;Wang Biaobing(Department of Materials Science and Engineering,Changzhou University,Changzhou 213164,China)
出处
《工程塑料应用》
CAS
CSCD
北大核心
2018年第4期98-102,112,共6页
Engineering Plastics Application
关键词
氨纶
多壁碳纳米管
还原氧化石墨烯
流变性能
黏度
spandex
multi-walled carbon nanotubes
reduced graphene oxide
rheological property
viscosity
