电场条件下高分子共混物组分浓度梯度化的研究

研究了聚乙烯醇／聚丙烯酸高分子共混物水溶液中，共混物各组分在电场诱导条件下沿电场方向的浓度梯度分布情况，通过测定不同时刻PVA／PAA高分子共混物水溶液在电场的不同区域内的pH值，研究了电场诱导下共混物各组分沿电场方向的迁移过程。结果表明，PAA^n-向电场正极迁移，同时由于浓差梯度，PVA向负极迁移，并形成浓度梯度分布。随时间的延长，高分子共混物的组分梯度程度逐渐加大。

Formation of Graded Component in PVA/PAA Polymer Blend Aqueous Solutions under Electric Field

The formation of the gradient component in PVA/PAA blend aqueous solution under the electric field has been investigated. The polymer blend aqueous solution was prepared by dissolving PVA/PAA(70/30) in aqueous solution at room temperature. As a kind of polyelectrolytes, PAA can ionize into PAA n - and \%n\%H\++ in the PVA/PAA blend aqueous solution. The PAA n - anions should migrate to the anode under the electric field, accompanied with the PVA moving to the cathode because of the concentration diffusion. The concentration of PAA along the electric field was determined by measuring the local pH of the aqueous solution. The gradient component distribution was formed in the PVA/PAA blend along the electric field.