摘要
利用 Brookfield DV-Ⅱ型粘度计对纤维素/NMMO·H2O 溶液体系的流变性能进行了研究,讨论了温度、纤维素浓度、浆粕聚合度及添加剂等对溶液粘度的影响。结果表明,纤维素/NMMO·H2O 溶液的流动活化能较低,因此其表观粘度随温度的变化不大;纤维素浓度和浆粕聚合度的增加都可使溶液粘度增大,但纤维素浓度对溶液粘度的影响更显著;抗氧化剂没食子酸丙酯(GPE)的加入减缓了加热时溶液粘度的下降,降低了纤维素的氧化降解;二甲亚砜(DMSO)的加入可有效地控制溶液粘度,改善溶液的加工性能。
The rheological properties of cellulose solution in N-methylmorpholine-N-oxide monohydrate were investigated by Brookfield DV-Ⅱ viscometer. The dependence of the shear viscosity on temperature, cellulose content, average degree of polymerization (DP) and addictives were discussed. The results showed that the cellulose solution had lower flow-activation energy, so its viscosity was less sensitive to variation of temperature. Both solutions exhibited increase in viscosity with increasing concentration and DP of cellulose. But the concentration had a significant effect on the viscosity of the solutions. As an antioxidant, GPE (gallic acid propyl ester) slowed down the decrease in viscosity of NMMO-cellulose-solution when heated and prevented oxidative degradation of cellulose. The addition of DMSO (dimethyl sulfoxide) could control the viscosity and improve the processing property of the solutions.
出处
《纤维素科学与技术》
CAS
CSCD
2005年第1期34-38,共5页
Journal of Cellulose Science and Technology
基金
广东省科技计划项目(2003C103016)
华南理工大学制浆造纸工程国家重点实验室研究基金(0210)
陕西省教育厅省级重点实验室 2001 年重点科研项目资助课题