The effect of CO2 on the viscosity of polystyrene/limonene solutions
The effect of CO2 on the viscosity of polystyrene/limonene solutions
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DOI：
10.1016/j.supflu.2014.01.012
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发表时间：
2014-04-01
影响因子：
3.9
通讯作者：
Rodriguez, J. F.
中科院分区：
文献类型：
--
作者：
Gutierrez, C.;Garcia, M. T.;Rodriguez, J. F.
我们演示了使用石英晶体粘度计来确定在高压二氧化碳存在下聚苯乙烯在柠檬烯中的溶液的粘度。这些测量值是在20至40 ℃的温度范围内，在高达50巴的压力下，在0.025、0.05、0.1、0.2、0.3和0.4 g PS/ml柠檬烯下测定的。在所研究的粘度范围内，所选研究变量（压力、温度和浓度）具有统计学显著性。发现在所有载荷下的溶液的粘度随着温度和压力的增加而降低，而CO2的增塑作用占主导地位，超过了气体施加的静水压力。从Arrhenius拟合的实验数据得到的系统的流动活化能达到40 kj/mol的最大值。为了在研究区域或接近工作极限的范围内进行内插和外推，开发了将混合物的粘度与压力和温度相关联的经验模型。最后，粘度数据用于确定溶剂质量和量化混合物的分层点。皇冠版权所有（C）2014由爱思唯尔B. V.出版保留所有权利。
We demonstrate the use of a quartz crystal viscometer to determine the viscosity of solutions of polystyrene in limonene in the presence of high pressure carbon dioxide. These measurements were determined up to 50 bar in the range of temperature from 20 to 40 degrees C and at 0.025, 0.05, 0.1, 0.2, 0.3 and 0.4 g PS per ml of limonene. The selected variables of study (pressure, temperature and concentration) were statistically significant over the range of viscosity studied. The viscosities of the solutions at all loadings were found to decrease with increasing temperature and pressure while the plastising effect of CO2 prevailing over the hydrostatic pressure applied by the gas. The flow activation energies of the system were obtained from an Arrhenius fitting of the experimental data reaching a maximum of 40 kj/mol. An empirical model correlating the viscosity of the mixtures to pressure and temperature was developed in order to interpolate and extrapolate in the study region or in a range close to the working limits. Finally, the viscosity data were used to determine the solvent quality and to quantify the demixing points of the mixtures. Crown Copyright (C) 2014 Published by Elsevier B.V. All rights reserved.