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Updated: May 19, 2026

Synthesis of Poly(N-isopropylacrylamide) Janus Microhydrogels for Anisotropic Thermo-responsiveness and Organophilic/Hydrophilic Loading Capability

Synthesis of Poly(N-isopropylacrylamide) Janus Microhydrogels for Anisotropic Thermo-responsiveness and Organophilic/Hydrophilic Loading Capability

Published on: February 27, 2016

Dual-Responsive Polyacrylamide Microspheres with Migration Swelling Plugging Time Window for Profile Control in Harsh

Wenwen Yang¹, Xiaojuan Lai¹, Fanxin Ma²

¹College of Chemistry and Chemical Engineering, The Youth Innovation Team of Shaanxi Universities, Shaanxi University of Science & Technology, Xi'an 710021, China.

|May 18, 2026

Summary

New dual-responsive polyacrylamide microspheres (PNMA) offer improved water control in challenging oil reservoirs. These smart materials exhibit tunable swelling and shrinking behaviors, enhancing oil recovery in high-temperature and high-salinity conditions.

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Controlled Synthesis and Fluorescence Tracking of Highly Uniform Poly(N-isopropylacrylamide) Microgels

Controlled Synthesis and Fluorescence Tracking of Highly Uniform Poly(N-isopropylacrylamide) Microgels

Published on: September 8, 2016

Area of Science:

Polymer Chemistry
Materials Science
Petroleum Engineering

Background:

Conventional profile-control agents lack thermal/salt stability and predictable plugging.
High-temperature and high-salinity reservoirs pose significant challenges for water management in oil extraction.

Purpose of the Study:

To design and synthesize temperature and salinity dual-responsive polyacrylamide microspheres (PNMA).
To evaluate PNMA's performance as a water-blocking agent in complex reservoir conditions.

Main Methods:

Ternary copolymerization of N-isopropylacrylamide, methacrylic acid, and a quaternary ammonium salt monomer.
Characterization of swelling behavior using logistic kinetic and Flory-Rehner models.
Evaluation of plugging efficiency through core flooding experiments and adsorption studies.

Main Results:

PNMA exhibited tunable swelling (83-573 nm) responsive to temperature and salinity.
Amino-ester functionalization enhanced rock-surface adsorption by 40% compared to traditional PAM.
Core flooding demonstrated an 82% reduction in high-permeability flow and a 17.5% increase in overall oil recovery.

Conclusions:

PNMA microspheres provide a novel solution for water control in harsh reservoir environments.
The developed material offers a controllable and effective paradigm for water management and oil stabilization.