| 摘要: | 我們透過小角度X射線散射(Small-Angle X-ray Scattering, SAXS)定量地研究了醇類含量對聚(苯乙烯-b-環氧乙烷)(Poly(styrene-block-ethylene oxide), PS-b-PEO)嵌段共聚物在四氫呋喃(THF)與醇類(甲醇、乙醇、正丙醇、異丙醇及正丁醇)的共溶劑中的自組裝行為的影響。在純THF的稀釋濃度下，PS-b-PEO傾向形成聚集體。當少量的水添加到THF中時，PS-b-PEO會形成具有相關非均勻性的有序結構，通過相分離生成。然而，當PS-b-PEO溶解在THF/醇類(甲醇、乙醇、正丙醇、異丙醇及正丁醇)共溶劑中時，這些凝膠結構是不存在的。當甲醇添加到溶液後，溶劑的品質會降低。我們通過計算臨界微胞濃度(Critical Micelle Concentration, CMC)和溶解度參數(Solubility Parameter)，討論了PS-b-PEO在不同比例的共溶劑與不同類型的醇類的結構演變。隨著THF/甲醇共溶劑中，甲醇含量的增加，溶液從聚集體轉變為具有核殼結構的分散微胞。;We have quantitatively investigated the effect of the alcohols(methanol, ethanol, 1-propanol, 2-proapnol, and 1-butanol) of various contents on the self-assembly behavior of polystyrene-block-poly(ethylene oxide)(PS-b-PEO) in cosolvents of tetrahydrofuran with alcohols(methanol, ethanol, 1-propanol, 2-proapnol, and 1-butanol) by small-angle X-ray scattering(SAXS). At a dilute polymer concentration in neat tetrahydrofuran(THF), PS-b-PEO preferentially forms clusters. However, when a small amount of water is added into THF, PS-b-PEO forms an ordered structure with correlated inhomogeneities generated through mesophase separation. Nevertheless, these gels are absent when PS-b-PEO is dissolved in THF/alcohols(methanol, ethanol, 1-propanol, 2-proapnol, and 1-butanol) cosolvents. After adding methanol to THF, the solvent quality would be reduced. We discuss the structural evolution of PS-b-PEO in different ratios of cosolvents and different types of alcohols(methanol, ethanol, 1-propanol, 2-proapnol, and 1-butanol) by calculating critical micelle concentration(CMC) and solubility parameters. As the content of methanol in THF/methanol cosolvents increases, the solutions transform from clusters to dispersed micelles with a core-shell conformation. |
