低取代羟乙基纤维素溶液在酸性凝固浴的扩散动力学  

The diffusion kinetics of low-substituted hydroxyethyl cellulose solution in acidic coagulation bath

作　　者：王文聪 杜淑宁 王鸿博 高卫东[1,2] WANG Wencong;DU Shuning;WANG Hongbo;GAO Weidong(Jiangsu Engineering Technology Research Center of Functional Textiles,Ministry of Education, Jiangnan University,Wuxi 214122,China;Key Laboratory of Eco-Textiles,Ministry of Education, Jiangnan University,Wuxi 214122,China)

机构地区：[1]江南大学,江苏省功能纺织品工程技术研究中心,江苏无锡214122 [2]江南大学,生态纺织教育部重点实验室,江苏无锡214122

出　　处：《丝绸》2018年第10期15-20,共6页Journal of Silk

基　　金：国家自然科学基金项目(51703085);江苏省自然科学基金项目(BK20170189);中央高校基本科研业务费专项资金资助项目(JUSRP11704)

摘　　要：纤维素及其衍生物溶解后凝固成形可制备纤维、膜或海绵等纤维素基制品,溶解和凝固过程对制品的结构和性能有重要影响。纤维素醚化改性后所得低取代羟乙基纤维素(HEC)被视为是粘胶工艺的良好替代品之一,但目前缺乏对其凝固过程中扩散动力学的研究。基于Fick扩散定律,通过原位监测凝固浴中的pH值,在平面扩散模型的基础上,计算得到HEC溶液中NaOH溶剂在醋酸水溶液中的扩散系数(1. 1×10^(-4)~2. 5×10^(-4)mm^2/s)。研究发现,提高凝固温度、凝固浴浓度或降低HEC溶液固含量可不同水平促进溶剂的扩散;合适的流体力学理论扩散模型可用以研究HEC试样微观结构影响溶剂扩散行为的规律。Cellulose-based products such as fibers,films and sponges could be prepared after dissolution and coagulation of cellulose or cellulose derivatives.The dissolution and coagulation process play a leading role for the properties and the structure of these products.Hydroxyethyl cellulose(HEC)with low molar substitution gained after cellulose etherification and modification is of great potential to replace the traditional viscose technology.However,there is lack of the research on the diffusion kinetics of HEC solutions in coagulation process.In this study,the diffusion coefficients of NaOH solvent in acetic acid solution were calculated by monitoring the change of pH values in the coagulation bath based on the plane diffusion model and Fick diffusion law,and the corresponding values were in the range of 1.1×10-4~2.5×10-4 mm 2/s.It was found that the increase of coagulation temperature and concentration of coagulation batch,or the decrease of solid content in HEC solution would enhance the diffusion of NaOH to different degrees.Besides,the appropriate hydrodynamic diffusion models could be used to study the influence law of microstructure of HEC samples on diffusion behavior of solvents.

关 键 词：羟乙基纤维素 NaOH溶剂 醋酸水溶液 扩散系数 凝固条件 

分 类 号：TS102.5[轻工技术与工程—纺织工程]