Abstract
In this research, a novel amphiphilic hydrophobically associative polymer nanocomposite (ADOS/OMMT) was prepared using acrylamide (AM), sodium 4-vinylbenzenesulfonate (SSS), N, N′-dimethyl octadeyl allyl ammonium bromide (DOAAB) and organo-modified montmorillonite (OMMT) through in situ polymerization. Both X-ray diffraction patterns and transmission electron microscopy images verified the dispersion morphology of OMMT in the copolymer matrix. Then, the effect of the introduction of OMMT layers on the copolymer properties was studied by comparing with pure copolymer AM/SSS/DOAAB (ADOS). The thermal degradation results demonstrated that the thermal stability of the ADOS/OMMT were better than pure copolymer ADOS. During the solution properties tests, ADOS/OMMT nanocomposite was superior to ADOS in viscosifying ability, temperature resistance, salt tolerance, shear resistance and viscoelasticity, which was because OMMT contributed to enhance the hydrophobic association structure formed between polymer molecules. Additionally, the ADOS/OMMT nanocomposite exhibited more excellent interfacial activity and crude oil emulsifiability in comparison to pure copolymer ADOS. These performances indicated ADOS/OMMT nanocomposite had good application prospects in tertiary recovery.
Highlights
On one hand, oil resources are being consumed rapidly owing to the population growth and the enhancement of living quality, and royalsocietypublishing.org/journal/rsos R
Compared with pure polymers (ADOS), ADOS/organo-modified montmorillonite (OMMT) had better temperature resistance. These results indicated that the OMMT layers dispersed in the polymer matrix could effectively reduce the destruction of temperature to the intermolecular hydrophobic association network
transmission electron microscopy (TEM) and X-ray diffraction (XRD) analysis proved that OMMT was successfully dispersed in an ADOS copolymer matrix in the form of exfoliation and intercalated structure
Summary
Oil resources are being consumed rapidly owing to the population growth and the enhancement of living quality, and royalsocietypublishing.org/journal/rsos R. Compared with traditional polymers, hydrophobic associating polymer solution behaves with better rheological properties, such as strong salinity tolerance, good shearing resistance and temperature resistance [1,17]. Polymer/MMT nanocomposites can achieve more excellent thermal stability, mechanical, wettability and barrier properties relative to pure polymers on account of strong interfacial interactions generated between the dispersed MMT platelets and the polymer matrices [27,28,29,30]. Several researchers in the field of petroleum chemistry have studied the effects of MMT nanoparticles on the properties of polymer solutions used for EOR technologies. Research on properties of aqueous solution of water-soluble amphiphilic hydrophobically associative polymer/modified MMT nanocomposites have rarely been reported previously. The solution properties, interfacial activities and emulsification ability of the copolymer/OMMT nanocomposites were studied, which are compared to those of pure polymers
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