Synthesis of an Acrylamide Copolymer Containing Nano-SiO2 by Ex Situ Cu(0)-Mediated SET-LRP

Ling Wang,Zhendong Li,Pingsen Huang,Wei Ding

doi:10.1155/2019/7379368

Abstract

We report herein the synthesis of a novel star-shaped copolymer containing nano-SiO2 by single-electron transfer living radical polymerization (SET-LRP) in aqueous solution. The effects of polymerization conditions, such as the total amounts and molar ratios of the monomer, initiator, catalyst, ligand, and modified nano-SiO2, have been investigated through a series of experiments. The prepared acrylamide copolymers have been characterized by FTIR spectroscopy and 1H NMR spectrometry. The properties of the copolymers have been assessed by viscometry and rheometry. The results confirmed that the nano-SiO2 functional monomer was successfully combined in the SET-LRP. The optimum polymerization conditions were established through orthogonal experiments as a ratio of [AM] : [DMAEMA] : [I] : [CuBr] : [Me6TREN] of 674.4 : 35.5 : 1 : 1 : 2 at a total concentration of [AM] + [DMAEMA] of 2.5 mol/L. The appropriate concentration of the nano-SiO2 functional monomer (NSFM) was 0.5 wt% with respect to AM + DMAEMA. The rheology of the star-shaped copolymer exhibited a shear-thickening property when the shear rate exceeded a critical value (100 s−1). The AM/DMAEMA/NSFM copolymer displayed a higher viscosity than AM/DMAEMA at the same concentration. It was found that AM/DMAEMA/NSFM exhibited better salt and temperature tolerances.

Highlights

Polymer flooding plays an important role in the field of enhanced oil recovery (EOR) [1, 2]
The results indicated that AM/ DMAEMA/nano-SiO2 functional monomer (NSFM) had better viscosifying property than AM/DMAEMA, and the viscosity of the former was higher than that of the latter at shear rates less than 100 s−1
A novel terpolymer containing nano-SiO2 has been synthesized at ambient temperature by single-electron transfer living radical polymerization (SET-LRP), employing a nacatneori-zSeidO2byfuFnTctIiRonsaplemctroonsocmopeyr.aTnhde1pHroNduMcRt hsapsebctereonmcehtarry

Summary

Introduction

Polymer flooding plays an important role in the field of enhanced oil recovery (EOR) [1, 2]. The second approach is to modify the molecular structure through the preparation of dendritic, star-shaped, or hyperbranched polymers, which exhibit excellent shear resistances due to their special reticular structures [9,10,11,12,13,14,15,16]. Cu(0)-mediated living radical polymerization or singleelectrontransfer living radical polymerization (Cu(0)-mediated LRP or SET-LRP) is a versatile approach that has long attracted considerable interest It has been widely used for the synthesis of star-shaped, branched, and hyperbranched polymers in recent years [17,18,19,20]. A nano-SiO2 functional monomer (NSFM) has been introduced into an AM/DMAEMA copolymer by Cu(0)-mediated LRP at room temperature (25°C) with the aim of obtaining more favorable temperature tolerance, salt tolerance, and shear resistance

Experimental

Results and Discussion

Conclusions