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Non-linear Viscoelastic Rheological Properties of PCC/PEG Suspensions
Hai-lin Yang, Jian-ming Ruan *, Jian-peng Zou, Qiu-mei Wu, Zhong-cheng Zhou, Yuan-yan Xie
State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China
Abstract:
The shear thinning and shear thickening rheological properties of PCC/PEG suspension were investigated with the increase of oscillatory amplitude stress at different constant frequencies.The results show that the complex viscosity was initially independent of stress amplitude and obvious shear thinning occurred, then dramatic shear thickening took place after reaching the minimum viscosity. Typically, in a constant frequency of 5 rad/s, the elastic modulus, viscous modulus, and tanδ (δ is the out-of-phase angle) vs. the stress amplitude was investigated.It is found that the elastic modulus initially appeared to be independent of stress amplitude and then exhibited a rapid decrease, but the viscous modulus was independent of amplitude stress at lower amplitude stress. After reaching the minimum value the viscous modulus showed a rapid increase. On the other hand, tanδ increased from 0.6 to 92, which indicates that the transition from elastic to viscous had taken place and tanδ showed a steep increase when shear thickening occurred. Lissajous plots are shown for the dissipated energy vs.different maximum stress amplitude in the shear thinning and shear thickening regions. The relationship of dissipated energy vs. maximum stress amplitude was determined, which follows a power law. In the shear thinning region the exponent was 1.91, but it steeply increases to 3.97 in the shear thickening region.
Key words:  Precipitated calcium carbonate, Suspension, Shear thickening, Dynamic oscillatory shear, Rheological response
FundProject:
Non-linear Viscoelastic Rheological Properties of PCC/PEG Suspensions
杨海林, 阮建明 *, 邹俭鹏, 伍秋美, 周忠诚, 谢元彦
南京工业大学制药与生命科学学院,南京210009中南大学粉末冶金国家重点实验室,长沙410083
摘要:
在不同的恒定频率下,研究了PCC(沉淀碳酸钙)/PEG200(聚乙二醇,平均分子量为200)分散体系的剪切变稀和剪切增稠的流变性能.随着动态剪切应力的升高,复数粘度开始不随应力而改变,而后出现明显的剪切变稀,当复数粘度达到最小值后出现强烈的剪切增稠.在固定频率5 rad/s下研究了模量以及滞后角的正切与应力幅度的关系,在低的应力下储能模量开始几乎与应力幅度无关,继而快速下降.滞后角的正切从0.6升高到92,表明体系发生了从弹性到粘性的转变,尤其在发生剪切增稠后滞后角的正切快速增大.从Lissajous图分别探索了在剪切变稀区和剪切增稠区的能量与最大应变的关系.应变周期内的消耗的能量与最大应变幅度指数关系得到了确认.在剪切变稀区指数为1.91,而在剪切增稠区由于形成了粒子簇激增至3.97.以上现象运用\粒子簇"理论得到了定性的解释.
关键词:  沉淀碳酸钙,悬浮液,剪切增稠,动态剪切,流变行为
DOI:10.1088/1674-0068/22/01/46-50
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