• 作者： Liaw, Der-Jang; Lin, Me-Chih
• 中文摘要： 本研究探討兩性離子聚合體,聚3-二甲基(丙烯酸乙基)銨丙烷磺酸鹽, Poly(3-dimethyl(acryloyloxyethyl)ammonium propane sulfonate)(poly(DAAPS)),之曇點、極限黏度、結合度,及離子強度之測定。兩性離子聚合體之最低鹽濃度和極限黏度與所使用之鹽類濃度有關。在鹽類溶液中Poly(DAAPS)之極限黏度較Poly(DMAPS)所受的影響小,此乃因為Poly(DMAPS)在.alpha.-碳上的位置帶有甲基,因此Poly(DAAPS)較Poly(DMAPS)易溶於鹽類的水溶液中。對於兩性離子單體或聚合體在氯化鈉存在下其結合度較低,顯示氫離子(H/sup +/)較難和磺酸鹽的末端 SO/sub 3//sup -/基結合。當離子強度增加時 pK/sub a/值降低。因為Poly(DAAPS)比 Poly(DMAPS)有較低的立體障礙、和低的玻璃轉化點(T/sub g/),以及具較低的疏水性,所以溶解度較高。
• 英文摘要： The aqueous solution properties of an ampholytic poly(3-dimethyl-(acryloyloxyethyl)ammonium propane sulfonate) (poly(DAAPS)) are studied by measurements of cloud point determination, intrinsic viscosity, degree of binding, and ionic strength. The minimum salt concentration and intrinsic viscosity of this polyampholyte are related to the type and concentration of added salt. The effect on intrinsic viscosity of poly(DAAPS) in the salt is smaller than that of poly(DMAPS) which contains methyl group in.alpha.-carbon position, indicating that poly(DAAPS) is more easy to dissolve in aqueous salt solution. Both the polymeric and monomeric betaines in the presence of NaCl have the lower degree of binding, indicating that the proton ion (H/sup +/) is relatively difficult to bind the SO/sub 3//sup -/ at the end of sulfobetaine. An increase in ionic strength causes the pK/sub a/ to decrease at the half-neutralization point. The fact that the solubility of poly(DAAPS) is larger than that of poly(DMAPS) might be due to the less steric effect, lower T/sub g/ and less hydrophobic properties for poly(DAAPS).
• 中文關鍵字： 聚二甲基(丙烯酸乙基)銨丙烷磺酸鹽; 低鹽濃度; 極限黏度; 結合度; 離子強度; 水溶液
• 英文關鍵字： Poly(Daaps); Minimum Salt Concentration; Intrinsic Viscosity; Degree Of Binding; Ionic Strength; Aqueous Solution