Solution properties and aggregating structures for a fluorine-containing polymeric surfactant with a poly(ethylene oxide) macro-monomer.

Xiaogang Wu,Xiaofei Lian,Yan Yang,Chuanrong Zhong

doi:10.1098/rsos.180610

Xiaogang Wu, Xiaofei Lian + Show 2 more

Open Access

https://doi.org/10.1098/rsos.180610

Copy DOI

Abstract

A polymeric surfactant (PFSA) was synthesized by the aqueous free-radical copolymerization using acrylamide, sodium 2-acrylamido-2-methylpropane sulfonate, allyl-capped octylphenoxy poly(ethylene oxide) (PEO) with the polymerization degree of 20 (AOP) and 1H,1H,2H,2H-perfluoro-1-decyl p-vinylbenzyl ether (VF). PFSA exhibited both the good surface and interfacial activities and the thickening behaviour. It could be used in enhanced oil recovery to increase both sweep and oil displacement efficiencies. The critical micelle concentration (CMC) of PFSA was 0.1 g l−1 in aqueous solution. The spherical micelles with the diameter of 100 nm were formed at CMC, and numerous compact worm-shaped micelles were observed above CMC. The interfacial tension was 0.027 mN m−1 for the 0.1 g l−1 PFSA solution containing 5 g l−1 NaCl and 0.209 g l−1 SDBS. The PFSA solutions still showed low interfacial tensions at high NaCl concentrations and temperatures, respectively, because of the incorporation of both VF and AOP containing long PEO.

Highlights

The molecular weights of polymeric surfactants are higher than 1000 g mol21 and are traditionally 103 – 104 orders of magnitude.& 2018 The Authors
The weight-average molecular weights (Mw) of PFSA, PAS and PFS were, respectively, 8.65 Â 104 g mol21, 14.1 Â 104 g mol21 and 11.98 Â 104 g mol21 according to the equation [h] 1⁄4 3.15 Â 1024 Mw 0.7 ([h]: intrinsic viscosity)
All PFSA chains were mono-molecular in aqueous solutions as well as adsorbed on the surface or interface of the solutions at extremely low surfactant concentrations, i.e. below 0.03 g l21

Summary

Introduction

The molecular weights of polymeric surfactants are higher than 1000 g mol and are traditionally 103 – 104 orders of magnitude.& 2018 The Authors. The linear synthetic polymeric surfactants are mainly non-ionic poly(ethylene oxide)/poly( propylene oxide) (PEO/PPO) block copolymers [8 – 10]. Their surface tensions are low to 33 mN m21 and are resistant to salts, especially multivalent metal cationic salts. Their cloud points are lower than 558C, at which the surfactants are precipitated from aqueous solutions. Their used temperatures cannot be higher than 558C in EOR

Methods

Results

Conclusion