影响NMMO纤维素溶液流变性的因素  

Rheological Characteristics on Solution of NMMO / Cellulose with Different Degree of Polymerization and Its Combination

作　　者：李金宝[1] 杨国鑫[1] 余伟燕 修慧娟[1] 张向荣[1] 

机构地区：[1]陕西科技大学轻工与能源学院陕西省造纸技术及特种纸品开发重点实验室,陕西西安710021 [2]塞纳医药包装材料(昆山)有限公司,江苏昆山215300

出　　处：《造纸科学与技术》2015年第2期31-34,共4页Paper Science & Technology

基　　金：陕西省教育厅项目(14JK1105);陕西科技大学博士启动基金(BJ13-14)

摘　　要：研究了体系温度、剪切速率、纤维素质量分数和不同聚合度配比等因素与纤维素/NMMO溶液流变性的关系,尤其是通过聚合度配比这一方法更准确地探讨了聚合度大小对纤维素溶液表观黏度的影响。研究结果表明:浓度为4%的纤维素/NMMO·H2O溶液体系其ΔEη为24.45k J/mo L。不同聚合度的纤维素溶液都属于假塑性流体,存在剪切变稀现象,高聚合度纤维素溶液的剪切变稀现象比低聚合度的更明显。相同浓度但不同聚合度配比条件下,溶液黏度增加与纤维素聚合度增加大致呈比例,但是配比为1∶1的纤维素溶液例外。Impacts of temperature, shear rate, cellulose concentration and DP proportion on rheological behavior of cellulose/NMMO · H2O solution were investigated,especially put forward a method of mixing different DP cellulose at different proportion to discuss more accurately effect of DP. The results show that the flow activation energy of 4% cellulose/NMMO · H2Owas 24.45kJ/mol. All kinds of cellulose solution with different DP were the pseudo- plastic fluid, and had shear thinning characteristic, especially with high DP. As the cellulose concentration was higher, apparent viscosity of its solution was bigger, but their relationship was not linear. Under the same cellulose concentration, the solution viscosity increased generally in proportion to DP rising, but the solution with proportion 1：1 was one exception, and its viscosity is relatively high.

关 键 词：纤维素 溶液 NMMO 聚合度 流变性 

分 类 号：TQ352.6[化学工程]