Bakshi Mandeep Singh, Sachar Shweta, Yoshimura Tomokazu, Esumi Kunio
Department of Chemistry, Guru Nanak Dev University, Amritsar 143005, Punjab, India.
J Colloid Interface Sci. 2004 Oct 1;278(1):224-33. doi: 10.1016/j.jcis.2004.05.025.
The association behavior of poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (PEO-PPO-PEO) block copolymers in aqueous solution with hexadecyltrimethylammonium bromide (HTAB), tetradecyltrimethylammonium bromide (TTAB), and dimethylene bis(decyldimethylammonium bromide) (10-2-10), was studied by fluorescence, viscosity, and Krafft temperature measurements. It has been observed that (EO)18(PO)31(EO)18 interacts more strongly than (EO)2(PO)15.5(EO)2 and (EO)2.5(PO)31(EO)2.5 with HTAB/TTAB due to synergistic interactions. A stronger capability of (EO)18(PO)31(EO)18 to interact with cationic surfactants arises from the greater number of electronegative EO units (total 36 EO units) than of (EO)2(PO)15.5(EO)2 (total 4 EO units) and (EO)2.5(PO)31(EO)2.5 (total 5 EO units). The antagonistic mixing behavior of present triblock polymers has been observed with 10-2-10. A difference in the mixing behavior of the latter from that of HTAB/TTAB has been attributed to its dimeric nature, which may create steric hindrances with triblock polymer components at the head group region in the mixed state.
通过荧光、粘度和克拉夫特温度测量研究了聚环氧乙烷-聚环氧丙烷-聚环氧乙烷（PEO-PPO-PEO）嵌段共聚物在水溶液中与十六烷基三甲基溴化铵（HTAB）、十四烷基三甲基溴化铵（TTAB）和二亚甲基双（癸基二甲基溴化铵）（10-2-10）的缔合行为。已观察到，由于协同相互作用，(EO)18(PO)31(EO)18与HTAB/TTAB的相互作用比(EO)2(PO)15.5(EO)2和(EO)2.5(PO)31(EO)2.5更强。(EO)18(PO)31(EO)18与阳离子表面活性剂相互作用的能力更强，这是因为其电负性EO单元的数量（总共36个EO单元）比(EO)2(PO)15.5(EO)2（总共4个EO单元）和(EO)2.5(PO)31(EO)2.5（总共5个EO单元）更多。已观察到当前三嵌段聚合物与10-2-10存在拮抗混合行为。后者与HTAB/TTAB混合行为的差异归因于其二聚体性质，这可能在混合状态下在头基区域与三嵌段聚合物组分产生空间位阻。
