Synthesis, microstructural characterization and hydrophobic intermolecular nano-aggregation behavior of acrylamide/2-acrylamido-2-methy-1-propane sulfonic acid/butyl acrylate co- and terpolymers

A nano‐Fe3O4 material coated with AM/AMPS copolymer for viscosity enhancement at harsh reservoir conditions

“…The characteristic absorption peaks of Fe 3 O 4 NPs appeared at 588 cm −1 , and the characteristic absorption peaks of SO 3 H appeared at 1213.2, 1180.4, and 2940.3 cm −1 , respectively. The characteristic absorption peak of NH 2 appeared at 3345.9 cm −1 , and the characteristic absorption peak of CO bond in the amide group appeared at 1695.3 cm −1 5,6 . Thus, the FTIR spectrum exhibited all the component signals in the structure of the Fe 3 O 4 ‐core/AM‐co‐AMPS copolymer‐shell NPs.…”

“…The characteristic absorption peak of NH 2 appeared at 3345.9 cm −1 , and the characteristic absorption peak of C O bond in the amide group appeared at 1695.3 cm −1 . 5,6 Thus, the FTIR spectrum exhibited all the component signals in the structure of the Fe 3 O 4 -core/AMco-AMPS copolymer-shell NPs. Figure 2 presents the thermo-gravimetric curves of Fe 3 O 4 -Oleic NPs and Fe 3 O 4 -Polymer NPs.…”

“…Among these methods, introducing inorganic nano‐particles to synthesize polymers/nano‐composites is a current research hotspot. Acrylamide(AM)/ 2‐acrylamido‐2‐methyl‐1‐propanesulfonic acid(AMPS) copolymer is an excellent high temperature resistant polymer with strong salt resistance performance, 5,6 and it is widely used in development of medium temperature reservoirs (60 ~ 80°C). However, the efficiency of AM/AMPS copolymer is still limited at high temperature(>90°C) and high salinity(>10 wt%) environments.…”

Structure, surface tension, and rheological behaviors of hydrophobically associative polyacrylamides by self‐emulsified microemulsion polymerization

“…[6][7][8][9] The hydrophobic portion of the copolymer is randomly distributed in homogeneous and heterogeneous polymerization. [10][11][12][13] Unlike the above two methods, the hydrophobic portion in the copolymer presents in the structure of the microblocks in the micelle polymerization, in which the length and number of the microblocks can be changed by experimental conditions. [14,15] These polyacrylamides with a hydrophobic microblock structure show favorable thickening properties.…”

Synthesis of polyacrylamides hydrophobically modified with butyl acrylate using a nanoclay with interlayer spaces for butyl acrylate aggregation: studies on the microstructure and aqueous solution viscosity

“…2,[8][9][10][11][12] On the other hand, 1 H-NMR method can give reliable results on the copolymer composition providing that mole fraction of the hydrophobic comonomer incorporated into the copolymer chains is high enough (>2 mole%) or hydrophobic comonomer contains two terminal methyl groups (N,Ndihexylacrylamide, for example). 2,5,13 There are different methods to synthesize HMPAMs such as heterogeneous, homogeneous and micellar copolymerizations. [1][2][3][4][5]13 HMPAMs can be synthesized via free-radical copolymerization technique without any additive (heterogeneous method).…”