疏水缔合聚合物溶液形态的研究

Solution conformation of hydrophobically associating polymers

用环境扫描电镜(ESEM)和动态光散射仪(DLS)对疏水缔合聚合物溶液形态进行了分析。结果表明,随着NaCl浓度的增加,实验所合成的疏水缔合聚合物的表观粘度先降低后增加而后再降低,但仍保持很高粘度。疏水缔合聚合物在去离子水体系中无论浓度高低均形成了空间网状结构。盐水体系中,当NaCl浓度为1000mg/L时所形成的结构与去离子水中的结构类似,均为网状结构,而在NaCl浓度为5000mg/L时,ESEM照片显示疏水缔合聚合物的结构为致密的树枝状结构。疏水缔合聚合物的浓度越大,其表观流体力学半径就越大,从而造成其增粘能力越强。

Solution properties and the conformation of the hydrophobically associating polymers in solution were investigated by means of environmental scan electric mirror(ESEM) and dynamic light scatter(DLS). The experimental results show that the surface-viscosity of the synthesized polymers decreases at first and then increases with the increase of the NaCl concentration(NaCl concentration 0～5?000 mg/L). On the other hand, the surface-viscosity decreases with the increase of the NaCl concentration(NaCl concentration 5?000～20?000 mg/L), but it still bares a relative high value. The polymer in solution assumes a three-dimensional network structure in deionized water independent of its concentration and the size of the mesh in the network varies with the polymer concentration. In the NaCl solution, it presents different characteristics. In the NaCl solution with concentration of 1?000 mg/L, the polymer solution takes on a compact network structure just the same as in the deionized water. In the NaCl solution with concentration of 5?000 mg/L, however, a compact branch-structure can be observed through ESEM. The increase of the polymer concentration enlarges its hydrodynamics radius, resulting in the increase of the thickening property.