• 作者： Chen, Wen-Jang
• 中文摘要： 本文主要利用界面黏著熱力學與電動力學探討氧化錫與氧化鐵水性膠體粒子在七種疏水性高分子材料表面吸附前後之溼潤性與接觸角的變化。在鹼性水溶液中（pH值大於等電位點），攜帶負電荷的水性膠體粒子與疏水性高分子薄膜相互排斥，無法進行界面黏著之吸附作用，而高分子仍具一定數值之水滴接觸角。在酸性水溶液中（pH值小於等電位點），具有低表面能之高分子薄膜與具有高表面能且攜帶正電荷之膠體粒子相互接觸後，經由界面吸附作用與粘著作用，實驗結果顯示高分子之親水性與溼潤性隨著吸附時間之增長而是高，最後形成一黏著效果良好之飽和覆蓋層，熱力學模型顯示溼潤速率隨著高分子表面能之遞增而增加。膠體粒子的表面電荷亦會對其安定性與界面吸附能力產生影響，其中具有較高界它電位之膠體粒子，由於表面電荷斥力之作用，極為安定，反而阻滯膠體粒子在高分子表面之吸附行為。
• 英文摘要： Hydrophobic films of seven different polymers are rendered hydrophilic by immersion into a wetting colloid; for example, the tin sol and the iron sol. Once adsorbed, the hydrosol coating has excellent adherence to the polymer surface; moreover, its presence produces a permanent modification to the water wettability. The aspects of interfacial thermodynamics and electrokinetics were investigated. The rates of the interfacial adsorption of wetting colloids on polymers were found to depend on surface properties. At pH values greater than the isoelectric points of 4.0 and 7.0 for respective tin colloids and iron colloids, none of the negatively charged colloids adsorbed on the polymer surfaces, and the substrate surfaces remained as hydrophobic. At pH values less than the isoelectric point of colloidal particles, the positively charged tin colloids adsorbed on the polymer surfaces over the pH range from 1.0 to 3.0, and so were the iron colloids adsorbing from pH 1.0 to 6.0. The hydrophilicity and water wettability of polymer surfaces increased with the incremental immersion time. The thermodynamic prediction were found to be consistent with the observed wettability data for the tin colloids, in which adsorption increased with increasing surface energies of the polymers. It is pointed out why the electrostatic stability of colloidal particles due to a large zeta potential can influence to wetting rates of the iron colloids to the polymer surface.
• 中文關鍵字： 溼潤膠體; 吸附; 疏水性聚合物; 表面能; Z電位; 靜電交互作用
• 英文關鍵字： Wetting Colloid; Adsorption; Hydrophobic Polymer; Surface Energy; Zeta Potential; Electrostatic Interaction