硝化细菌纤维素溶液的流变性  

Rheological Properties of Nitrated Bacterial Cellulose Solution

作　　者：朱娟[1] 罗庆平[1] 李兆乾[1] 刘勋[1] 段晓惠[1] 裴重华[1] 赵静 毛长勇 

机构地区：[1]西南科技大学四川省非金属复合与功能材料重点实验室-省部共建国家重点实验室培育基地,四川绵阳621010 [2]泸州北方化学工业有限公司,四川泸州646003

出　　处：《含能材料》2016年第4期375-379,共5页Chinese Journal of Energetic Materials

基　　金：四川省非金属复合与功能材料重点实验室开放项目(13ZXFK08)

摘　　要：以N，N-二甲基甲酰胺（DMF）为溶剂，按一定比例配制不同含氮量的硝化细菌纤维素（NBC）溶液。通过哈克（HAAKE）旋转流变仪，研究了溶液浓度、NBC含氮量对其溶液粘度的影响，以及溶液浓度与粘度的依赖性关系，并对NBC溶液的粘弹性能进行了应力扫描和频率扫描分析。结果表明，当NBC溶液浓度为0．5％-5．0％时，溶液体系为牛顿流体，粘度随着浓度的增加而增大，满足指数型增长关系；当体系浓度增大到5．5％时，NBC溶液为非牛顿流体，表现出剪切变稀效应，其剪切应力及剪切速率满足幂函数增长关系。随着NBC分子量的增加，溶液粘度增大。高分子量的NBC，有助于溶液体系稳定性的提高，同时也减弱了其对外界刺激性的响应。Using N, N-dimethylformamide （DMF） as solvent, nitrated bacterial cellulose （NBC） solutions with different nitrogen contents were prepared according to a certain proportion. The effects of solution concentrations and nitrogen contents of NBC on the viscosities of NBC solutions and the dependence relationship of concentrations and viscosities of the solutions were studied by a HAAKE rotational rheometer, and the viscoelasticity of NBC solution was analyzed through its stress scanning and frequency scanning . Results show that the solution system is the Newtonian-fluid when the concentration of NBC solution is in the range of 0.5% -5.0%, and the viscosity increases as the increase of the solution concentration, meeting an exponential function growth re- lation. When the concentration of NBC solution is 5.5%, NBC solution is the non-Newtonian fluid, showing a shear thinning effect, and the shear stress and shear rate meet a power function growth relation. The viscosities of NBC solutions increase with the increase of NBC molecular weight. NBC with high molecular weight helps to improve the stability of the solution system and makes it less response to external stimulus.

关 键 词：硝化细菌纤维素(NBC) 粘度 流变性能 牛顿流体 

分 类 号：TQ352.1[化学工程]