纤维素在NMMO水溶液中的溶胀过程及影响因素分析
|
摘要
采用显微镜观察和离心表征的方法,通过控制单一因素变量探讨溶胀时间、溶胀温度、N-甲基吗啉-N-氧化物(NMMO)溶液质量分数等对纤维素在NMMO水溶液中溶胀行为的影响。显微镜观察的结果表明:在溶胀初期,溶剂迅速渗透到纤维素中使单纤维直径变大,20 min后纤维素溶胀接近饱和,纤维直径基本不再变化;随着NMMO质量分数的增加、溶胀温度的升高,纤维素纤维的溶胀率以及吸液率增加,表明纤维素溶胀效果更好。
The effects of swelling time, swelling temperature and concentration of N-methylmorpholine-Noxide(NMMO) aqueous solution on the swelling behavior of cellulose were investigated by the methods of microscopic observation and centrifugal characterization. The results from microscopic observation showed that the solvent rapidly penetrated into the cellulose to increase the diameter of the single fiber in the initial stage of swelling, after 20 minutes, the fiber diameter did not change substantially. With the increase of NMMO concentration and the temperature, the swelling ratio and the absorbency characteristics of cellulose fibers increased, which illustrated that the swelling effect of cellulose was better.
The effects of swelling time, swelling temperature and concentration of N-methylmorpholine-Noxide(NMMO) aqueous solution on the swelling behavior of cellulose were investigated by the methods of microscopic observation and centrifugal characterization. The results from microscopic observation showed that the solvent rapidly penetrated into the cellulose to increase the diameter of the single fiber in the initial stage of swelling, after 20 minutes, the fiber diameter did not change substantially. With the increase of NMMO concentration and the temperature, the swelling ratio and the absorbency characteristics of cellulose fibers increased, which illustrated that the swelling effect of cellulose was better.
引文
[1]赵家森,王渊龙,程博闻.绿色纤维素纤维——Lyocell纤维[J].纺织学报, 2004, 25(5):124-125.
[2]杨阳,张慧慧,孟勇伟,等. Lyocell纤维的阻燃改性研究[J].纤维素科学与技术, 2015, 23(1):1-7.
[3]罗康佳,郭建生,李静怡,等.纤维素的溶解技术与研究现状[J].合成纤维, 2018, 47(1):1-5.
[4]荀红利. Lyocell纤维生产过程中NMMO浓度测定方法研究[J].合成纤维, 2017, 46(11):46-48.
[5]顾广新,沈弋弋,邵惠丽,等.纤维素/NMMO溶液溶解的方法及其溶液的表征[J].东华大学学报(自然科学版), 2001, 27(5):127-131.
[6] CUISSINAT C, NAVARD P. Swelling and dissolution of cellulose part1:Free floating cotton and wood fibres in N-methylmorpholine-N-oxidewater mixtures[J]. Macromolecular Symposia, 2006, 244(1):1-18.
[2]杨阳,张慧慧,孟勇伟,等. Lyocell纤维的阻燃改性研究[J].纤维素科学与技术, 2015, 23(1):1-7.
[3]罗康佳,郭建生,李静怡,等.纤维素的溶解技术与研究现状[J].合成纤维, 2018, 47(1):1-5.
[4]荀红利. Lyocell纤维生产过程中NMMO浓度测定方法研究[J].合成纤维, 2017, 46(11):46-48.
[5]顾广新,沈弋弋,邵惠丽,等.纤维素/NMMO溶液溶解的方法及其溶液的表征[J].东华大学学报(自然科学版), 2001, 27(5):127-131.
[6] CUISSINAT C, NAVARD P. Swelling and dissolution of cellulose part1:Free floating cotton and wood fibres in N-methylmorpholine-N-oxidewater mixtures[J]. Macromolecular Symposia, 2006, 244(1):1-18.