Mines ParisTech, Centre de Mise en Forme des Matériaux - CEMEF, UMR CNRS 7635, BP 207, 06904 Sophia-Antipolis, France.
Carbohydr Polym. 2013 Feb 15;92(2):1966-71. doi: 10.1016/j.carbpol.2012.11.066. Epub 2012 Nov 30.
Rheological properties of cellulose acetate/1-ethyl-3-methylimidazolium acetate (EMIMAc) solutions are studied using shear dynamic and steady state rheology in a large range of polymer concentrations (from 0.1 to 10 wt.%) and temperatures (from 0 °C to 80 °C). Master plots for storage and loss moduli and for dynamic viscosity were built and shift parameters determined. Cellulose acetate/EMIMAc behaves as a classical polymer solution and obeys Cox-Merz law. Cellulose acetate intrinsic viscosity [η] was determined as a function of temperature and compared with the literature data for cellulose acetates dissolved in other solvents and cellulose dissolved in EMIMAc. Cellulose acetate intrinsic viscosity turned out to be much less temperature sensitive than that of cellulose. Specific viscosity-C[η] master plot was built: the slopes in log-log scale are 1.2 and 3.1 in dilute and semi-dilute regions, respectively. The activation energy as a function of concentration follows a power-law dependence.
采用剪切动态和稳态流变学方法，在较大的聚合物浓度（从 0.1 到 10 重量%）和温度范围（从 0°C 到 80°C）下研究了醋酸纤维素/1-乙基-3-甲基咪唑醋酸盐（EMIMAc）溶液的流变性能。建立了储能模量和损耗模量以及动态粘度的主图，并确定了位移参数。醋酸纤维素/EMIMAc 表现为典型的聚合物溶液，符合 Cox-Merz 定律。纤维素醋酸酯的特性粘数[η]随温度的变化而确定，并与其他溶剂中溶解的纤维素醋酸酯和 EMIMAc 中溶解的纤维素的文献数据进行了比较。醋酸纤维素的特性粘数比纤维素对温度的敏感性低得多。建立了比浓粘度-[η]主图：在稀和半稀区的对数-对数标度上，斜率分别为 1.2 和 3.1。浓度的活化能遵循幂律关系。
