阴离子磺酸盐型Gemini表面活性剂与PEO-PPO-PEO嵌段共聚物相互作用的研究

doi:10.6023/A13111118

摘要/Abstract

用差示扫描微量热、等温滴定微量量热、动态光散射和核磁共振(NOESY，弛豫时间)技术，研究了在pH＝9时阴离子磺酸盐型Gemini表面活性剂12-3-12(SO₃)₂与PEO-PPO-PEO嵌段共聚物F127 (EO₉₇PO₆₉EO₉₇)和P123 (EO₂₀PO₇₀EO₂₀)之间的相互作用. 研究发现，随着12-3-12(SO₃)₂浓度的增大，聚合物的临界胶束温度(CMT)降低. 与传统的单链离子表面活性剂相比，12-3-12(SO₃)₂具有更强的降低共聚物CMT的能力. 此外，在低于聚合物的CMT时，12-3-12(SO₃)₂与聚合物单体可以形成聚合物/表面活性剂胶束聚集体；在高于聚合物的CMT时，12-3-12(SO₃)₂的加入首先与聚合物单体和胶束的混合物或聚合物胶束形成聚合物/12-3-12(SO₃)₂混合胶束，然后随着12-3-12(SO₃)₂浓度的增大，混合胶束逐步解离为小的聚集体，但是，即使在很高的12-3-12(SO₃)₂浓度时，混合胶束也未完全解离.

关键词: Gemini 表面活性剂, 嵌段共聚物, 相互作用, 差示扫描微量热, 等温滴定微量量热

The interaction of anionic sulfonate gemini surfactant 1,3-bis(N-dodecyl-N-propylsulfonate sodium)-propane (12-3-12(SO₃)₂) with two triblock copolymers poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide), F127 (EO₉₇PO₆₉EO₉₇) and P123 (EO₂₀PO₇₀EO₂₀) having the similar hydrophobic PPO central block but with different hydrophilic PEO end block, has been studied in aqueous solution at pH 9 by using differential scanning calorimetry (DSC), isothermal titration calorimetry (ITC), dynamic light scattering (DLS) and NMR techniques. At pH 9, the sulfonate groups of 12-3-12(SO₃)₂are completely deprotonated and each molecule carries two negative charges as an anionic gemini surfactant. DSC measurements have shown that the critical micellar temperature (CMT) of the two copolymers decreases as the 12-3-12(SO₃)₂ concentration increases. Moreover, at intermediate 12-3-12(SO₃)₂ concentrations, there appear two overlapping endothermic peaks, which is related to the aggregate transition between micelles with different sizes and microstructures, which has been substantiated by the DLS and NMR (spin-lattice (T₁) and spin-spin (T₂) relaxation times, and two-dimensional nuclear Overhauser effect spectroscopy (2D NOESY)) measurements. Compared with traditional single-chain ionic surfactants, the anionic gemini surfactant 12-3-12(SO₃)₂has a much stronger ability of lowering the CMT of copolymers, which should be attributed to the stronger aggregation ability and the lower critical micellar concentration of 12-3-12(SO₃)₂. Furthermore, a combination of experiments involving ITC and DLS has shown that 12-3-12(SO₃)₂ binds to the two copolymers at temperatures below and above their CMT. At the temperature below their CMT, the 12-3-12(SO₃)₂micelles form complex with monomeric copolymer, which is similar to that observed in the traditional single-chain ionic surfactant/copolymer systems, but the critical aggregation concentration for the onset of 12-3-12(SO₃)₂binding to the two copolymers is very low. At temperatures above their CMT, the association of 12-3-12(SO₃)₂ with a mixture of monomeric and micellar copolymer or micellar copolymer leads to the formation of mixed copolymer/12-3-12(SO₃)₂ micelles within copolymers and then breakdown of mixed micelles into smaller mixed micelles, but the mixed copolymer/surfactant micelles have not been completely disrupted. Moreover, at high 12-3-12(SO₃)₂concentrations, the hydrodynamic radii (R_h) of F127/12-3-12(SO₃)₂ micelles level off, while the R_h of P123/12-3-12(SO₃)₂ micelles have a gradual increase. The increase of R_hmight be accounted for the increase in micellar weight or aggregation number.

Key words: gemini surfactant, block copolymer, interaction, differential scanning calorimetry, isothermal titration calorimetry

引用此文

王瑞娟, 王毅琳. 阴离子磺酸盐型Gemini表面活性剂与PEO-PPO-PEO嵌段共聚物相互作用的研究[J]. 化学学报, 2014, 72(1): 41-50.

Wang Ruijuan, Wang Yilin. Interaction of Anionic Sulfonate Gemini Surfactant with PEO-PPO-PEO Triblock Copolymers[J]. Acta Chimica Sinica, 2014, 72(1): 41-50.

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