Interfacial tension between polymer melts measured by shear oscillations of their blends
Interfacial tension between polymer melts measured by shear oscillations of their blends
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DOI：
10.1122/1.550304
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发表时间：
1992-08
影响因子：
3.3
通讯作者：
H. Gramespacher;J. Meissner
中科院分区：
文献类型：
--
作者：
H. Gramespacher;J. Meissner
当剪切振动与聚苯乙烯（PS）/聚（甲基丙烯酸甲酯）（PMMA）共混物的熔体进行时，总的变形有一个大的弹性部分在低频率。这一发现是由共混物两相之间的界面张力作用引起的。一个简单的模型允许一个描述的界面张力的影响，在一个广泛的频率范围内的所有混合比的共混物组分的存储和损耗模量。这种共混物的加权弛豫谱τH（τ）显示出具有与界面张力相关的特征弛豫时间的附加峰。由该特征弛豫时间可以确定PS和PMMA熔体之间的界面张力α。在170 °C下得到的α=（1.9±0.3）×10−3 N/m与从共混物熔体伸长后的恢复获得的值非常一致。
When shear oscillations are performed with melts of polystyrene (PS)/poly(methylmethacrylate) (PMMA) blends the total deformation has a large elastic portion at low frequencies. This finding is caused by the interfacial tension acting between the two phases of the blends. A simple model allows one to describe the influence of the interfacial tension on the storage and the loss moduli in a broad frequency range for all mixing ratios of the blend components. The weighted relaxation spectra τH(τ) of such blends show an additional peak with a characteristic relaxation time that is correlated with the interfacial tension. From this characteristic relaxation time the interfacial tension α between the melts of PS and PMMA can be determined. The resulting α=(1.9±0.3)×10−3 N/m at 170 °C is in good agreement with the value obtained from recovery following melt elongation of the blends.