Polar interactions at liquid/polymer interfaces
Polar interactions at liquid/polymer interfaces
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DOI：
10.1163/156856107781393875
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发表时间：
2007-07-01
影响因子：
2.3
通讯作者：
Carre, Alain
中科院分区：
文献类型：
--
作者：
Carre, Alain
在文献中已经提出了许多关系来解释润湿性的固体和液体的表面自由能。在基于表面自由能分量的经典方法中，液体和固体之间的相互作用的能量从液体和固体表面自由能的分散和极性贡献的几何平均值获得。在这项工作中，它表明，极性液体的表面极性可以模拟对齐的永久偶极子的相互作用。一个很好的协议被发现之间的表面极性的极性特征的极性液体（水，甲酰胺和乙二醇）的表面自由能的极性分量和从他们的偶极矩计算的相互作用的偶极能。在液体/聚合物界面处，极性相互作用通过与液体表面自由能的极性分量的简单比例关系来更好地描述。这一观察使我们评估的假设，诱导极性相互作用在液体/聚合物界面，固体的表面极性是由极性液体与固体表面接触引起的。因此，一系列的极性和非极性液体在各种聚合物基材上的接触角的变化似乎是在更好的协议相比，永久极性相互作用的经典描述，使表面极化率定义为聚合物。使用的表面极化率的方法，而不是极性组件的固体表面，我们还发现，分散体（非极性）的聚合物表面自由能的分量得到了更好的信心，特别是通过考虑到非极性和极性液体探针的接触角，甚至通过考虑只有极性液体探针。
Numerous relationships have been proposed in the literature to interpret wettability in terms of solid and liquid surface free energies. In the classical approach based on surface free energy components, the energy of interactions between the liquid and the solid is obtained from the geometric mean of the dispersion and polar contributions of the liquid and solid surface free energies. In this work, it is shown that the surface polarity of polar liquids can be modeled by the interaction of aligned permanent dipoles. A good agreement is found between the surface polarity characterized by polar component of the surface free energy of polar liquids (water, formamide and ethylene glycol) and the dipolar energy of interactions calculated from their dipole moment. At the liquid/polymer interfaces, polar interactions are better described by a simple relationship of proportionality with the polar component of the liquid surface free energy. This observation leads us to evaluate the hypothesis of induced polar interactions at liquid/polymer interfaces, the surface polarity of the solid being induced by the polar liquid in contact with the solid surface. Thus, the variation of the contact angle of a series of polar and non-polar liquids on various polymer substrates appears to be in better agreement when compared to the classical description of permanent polar interactions, so that a surface polarizability is defined for polymers. Using the surface polarizability approach rather than the polar component for the solid surface, we find also that the dispersion (non-polar) component of the polymer surface free energy is obtained with a better confidence, especially by taking into account the contact angles of both non-polar and polar liquid probes, or even by considering only polar liquid probes.