Association Behavior of Water-borne Associative Polymers and Its Application to New Dispersion System

研究了疏水改性剂仅位于主链一端的聚乙烯醇及其对照聚合物在不同浓度水溶液中的性能。采用脉冲梯度自旋回波核磁共振波谱（PGSE NMR）和流变法分别研究了自扩散率和粘度。尝试用该结合聚合物制备新型分散体系作为应用研究。结论如下：(1)在PGSE核磁共振测量中，所使用聚合物的亚甲基、乙酰基和羟基的三个元素质子表现出相同的自扩散系数。(2)疏水改性聚乙烯醇在浓度为2 wt%时，其扩散率突然下降，这可能是由非缔合状态向分子间缔合状态转变引起的。(3)疏水性基团的存在使黏度增大，自扩散系数减小。(4)在低于1wt%的浓度下，所有疏水改性聚乙烯醇均不发生缔合。(5)利用水性聚合物获得了亚微米级的氧化锆细颗粒。

Hydrophobically modified poly(vinyl alcohol)s, in which hydrophobic modifiers are located only at the one end of the backbone, and their control polymers were investigated how they behave in aqueous solution at various concentrations. The techniques used were pulsed gradient spin echo nuclear magnetic resonance spectroscopy (PGSE NMR) and rheometry to investigate self-diffusivity and viscosity respectively. An attempt to create new dispersion systems using the associative polymer was made as an application study.The followings have been concluded.(1) In the PGSE NMR measurements, the three gerent protons belonging to the methylene, acetyl and hydroxyl groups of the polymers used showed the same self-diffusion coefficient.(2) A hydrophobically modified poly(vinyl alcohol) exhibited an abrupt decrease in diffusivity with concentration at 2 wt%, which may be caused by transition from a non-association state to an inter-molecular association state.(3) Existence of hydrophobic group made viscosity larger, and self-diffusivity smaller.(4) At concentrations less than 1wt%, all the hydrophobically modified poly(vinyl alcohol)s did not associate.(5) Zirconia fine-particles of submicron in size were obtained using the water-borne polymers.