Copolymerization Behavior of Acrylamide-Based Polymers in Ionic Liquid Media.

Area of Science:

• Polymer Chemistry
• Materials Science

Background:

• Acrylamide-based copolymers are versatile materials.
• Reaction media significantly influence copolymerization and material properties.
• Understanding these influences is key to tailoring copolymer performance.

Purpose of the Study:

• To investigate the impact of ionic liquids ([BMIM]Oac) versus water as reaction media on acrylamide-based copolymerization.
• To synthesize and characterize copolymers of acrylamide with sodium p-styrene sulfonate (SSS) and 10-undecylenoic acid (UA).
• To evaluate how different media affect copolymer properties like thermal stability, morphology, and resistance to temperature, salt, and shear.

Main Methods:

• Synthesis of four copolymers: P(AM-SSS) and P(AM-UA) in both water and [BMIM]Oac.
• Characterization using infrared spectroscopy and 1H NMR to analyze molecular structure and copolymerization rates.
• Evaluation of thermal stability via synchronous thermal analysis and micro-morphology using scanning electron microscopy.
• Assessment of solution properties including resistance to temperature, salt, and shear.

Main Results:

• Ionic liquid media led to more uniform molecular chains with reduced continuous acrylamide units.
• Copolymers synthesized in [BMIM]Oac exhibited robust and loose three-dimensional structures.
• P(AM-SSS) in [BMIM]Oac showed enhanced viscosity retention under temperature and shear stress, with a decomposition temperature of 260 °C.
• P(AM-UA) in [BMIM]Oac demonstrated excellent salt resistance, maintaining high viscosity retention at extreme Na+ concentrations.

Conclusions:

• The ionic liquid [BMIM]Oac significantly improves the performance of acrylamide-based copolymers.
• Tailoring reaction media allows for enhanced thermal stability, shear resistance, and salt tolerance in copolymers.
• [BMIM]Oac is a promising medium for synthesizing high-performance copolymers for diverse applications.