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Effects of nonionic surfactant on the rheological property of associative polymers in complex formulations |
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| Authors: | Do-Hoon Kim Seong-Geun Oh Junoh Kim Dong June Chung |
| Affiliation: | a Amore-Pacific Co. R&D Center, 314-1 Bora-dong, Giheung-gu, Yongin-si, Gyeonggi-do 449-729, Republic of Korea b Division of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA c Department of Chemical Engineering, Hanyang University, Seoul 133-791, Republic of Korea d Department of Polymer Science and Engineering, SKKU, Su-Won 440-746, Republic of Korea |
| Abstract: | The rheological properties of hydrophobically modified ethoxylated urethane (HEUR) were investigated in the presence of a nonionic surfactant, polyoxyethylene stearyl ether (C18(EO)20). The presence of nonionic surfactants played an important role in tuning the rheological properties of HEUR aqueous solutions. Observing both plateau modulus and viscoelastic relaxation time of HEUR aqueous solutions with varying the concentration of C18(EO)20 allowed us to demonstrate that C18(EO)20 readily interacts with the hydrophobic segments of HEUR polymers, which eventually formed a strong micellar network. Moreover, the micellar network formed at a critical concentration of C18(EO)20, ∼0.6% w/v, was indeed stable against both ionic strength and pH in the aqueous medium and complex formulations, such as a colloid suspension and an oil-in-water emulsion, thus providing more practical applications as thickeners for a wide variety of complex formulations. |
| Keywords: | Hydrophobically modified ethoxylated urethane (HEUR) Nonionic surfactants Rheological properties |
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