Journal of Coatings Technology and Research ( IF 2.3 ) Pub Date : 2021-07-29 , DOI: 10.1007/s11998-021-00505-w Sweta Sarangi 1 , Suresh Kumar Yatirajula 1 , Vinod Kumar Saxena 1
|
Microfibrillated cellulose (MFC) is a noble class of material that has drawn considerable attention due to its numerous properties such as mechanical robustness, high aspect ratio, lower coefficient of thermal expansion, water retention ability, barrier properties to oxygen, compatibility with biomaterials, biodegradability, large surface area and interesting rheology. This present work deals with the rheology of MFC suspension in water. The effect of temperature on the concentration of the suspension of MFC was studied. Three regimes of MFC were observed for the shear rate lying in the range of 0.01–1000 s−1, supported by a buildup of a network of hydroxyl groups present on the surface, resulting in shear thinning, shear thickening, and shear thinning regions, respectively. An increase in the concentration of MFC, increased viscosity, and the dominance of storage modulus were observed. A high value of storage modulus indicates a higher degree of crosslinking of fibrils. The experimental data were well fitted by using the Ostwald-de Waele power law model. The results suggested that an increase in the temperature did not have any significant effect on the MFC rheology in the temperature range of 25–60°C. The Gaussian process regression model was used to determine the performance parameters. Dynamic oscillatory measurements were performed to validate the viscoelastic behavior.
Graphic abstract
中文翻译：
微纤化纤维素的线性和非线性流变学评价
微纤化纤维素 (MFC) 是一类高贵的材料，由于其众多特性而备受关注，例如机械强度、高纵横比、较低的热膨胀系数、保水能力、对氧气的阻隔性、与生物材料的相容性、生物降解性, 大表面积和有趣的流变学。目前的工作涉及 MFC 悬浮液在水中的流变学。研究了温度对 MFC 悬浮液浓度的影响。对于在 0.01-1000 s -1范围内的剪切速率，观察到三种 MFC 状态，由表面上存在的羟基网络的积累支持，分别导致剪切稀化、剪切增稠和剪切稀化区域。观察到 MFC 浓度增加、粘度增加和储能模量占优势。较高的储能模量值表明原纤维的交联度较高。实验数据通过使用 Ostwald-de Waele 幂律模型拟合得很好。结果表明，在 25-60°C 的温度范围内，温度升高对 MFC 流变学没有任何显着影响。高斯过程回归模型用于确定性能参数。进行动态振荡测量以验证粘弹性行为。
京公网安备 11010802027423号