Abstract
Oligomeric surfactants possess superior physicochemical properties making them a promising future in applications, but cumbersome covalent synthesis and purification seriously impede their development. Recently, dynamic surfactants fabricated via non-covalent interaction have attracted considerable attention. Here, we developed a dynamic oligomeric surfactant by simple neutralization reaction in situ without extra inorganic salts, and the degree of oligomerization can be flexibly changed in 1 ~ 3 by controlling the molar ratio. Through surface activity, dynamic light scattering, rheology, and freeze-fracture transmission electron microscopy, it was found that the pseudo-gemini or trimeric surfactants are readily to form viscoelastic wormlike micelles and show remarkable thickening ability, as similar to that of conventional covalent oligomeric counterparts. However, due to the nature of non-covalent bond, the viscoelastic fluid based on pseudo-oligomeric surfactant is highly thermosensitive compared with common oligomeric surfactant systems. Additionally, a scaling law of correlating C * with the degree of oligomerization was revealed for the first time in viscoelastic oligomeric surfactant system, which is convenient for forecasting the overlapping concentration and controlling the viscoelasticity of solution.
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Acknowledgment
This work was financially supported by the National Natural Science Foundation of China (grant no. 21503094), the Fundamental Research Funds for the Central Universities (JUSRP 51507), the Open Research Fund of the Key Laboratory of Food Colloids and Biotechnology Ministry of Education, Jiangnan University (JDSJ2014-01), the Natural Science Foundation (BK20150128), and the Qinglan Project of Jiangsu Province, People’s Republic of China.
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The additional results: steady rheology spectrum of 2PMA-HCA and 1PMA-HCA with different concentration, dynamic rheology of 150 mM 2PMA-HCA. This material is available free of charge via the Internet at http://pubs.acs.org. (DOCX 293 kb)
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Zhang, Y., An, P., Qin, A. et al. Self-assembly and rheological behaviors of dynamic pseudo-oligomeric surfactant. Colloid Polym Sci 294, 1743–1754 (2016). https://doi.org/10.1007/s00396-016-3937-0
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DOI: https://doi.org/10.1007/s00396-016-3937-0