Rheological Properties of Dispersions of Spherical Particles in Polymer Solutions
Rheological Properties of Dispersions of Spherical Particles in Polymer Solutions
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DOI：
10.1122/1.549300
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发表时间：
1973-03
期刊：
影响因子：
--
通讯作者：
S. Onogi;Takayoshi Matsumoto;Yoshiro Warashina
中科院分区：
文献类型：
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作者：
S. Onogi;Takayoshi Matsumoto;Yoshiro Warashina
通过旋转圆筒型流变仪在较宽的温度、剪切速率和频率范围内测量聚苯乙烯溶液中由不同尺寸的聚苯乙烯共聚物颗粒组成的分散体系的稳态流动和动态粘弹性能。使用分散系统的修正卡森方程评估的屈服值被发现与温度无关。将时间-温度叠加应用于流动曲线和动态特性的频率依赖曲线，给出了相同的位移因子，该因子服从WLF型方程并且几乎与颗粒的尺寸和含量无关。屈服值随着分散介质中颗粒含量和聚合物浓度的增加而增加。粒径越小，屈服值越大。储存剪切模量 G' 和损耗模量 G'' 的频率相关曲线显示出在较低频率下低于橡胶平台的第二平台。讨论了屈服值与复剪应力之间的相关性。
The steady flow and dynamic viscoelastic properties of disperse systems consisting of polystyrene copolymer particles of different sizes in polystyrene solutions were measured by means of rotating cylinder type rheometers over wide ranges of temperature, rate of shear, and frequency. The yield values, evaluated by use of the modified Casson equation for disperse systems, were found to be independent of temperature. Time‐temperature superposition was applied to the flow curves and the frequency dependence curves of the dynamic properties, giving identical shift factors which obeyed the WLF type equation and were almost independent of the size and content of the particles. The yield value increased with increasing particle content and polymer concentration in the disperse medium. The smaller the particle size, the larger the yield value. The frequency dependence curves of the storage shear modulus G′ and the loss modulus G″ showed second plateaus lower than the rubbery plateau at lower frequencies. The correlation between the yield value and the complex shear stress is discussed.