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Purification Processes for Generating Cationic Lignin-Acrylamide Polymers.

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Ethanol extraction and membrane filtration are effective for purifying lignin-acrylamide-diallyl dimethylammonium chloride copolymers. These methods yield polymers with improved solubility, thermal stability, and flocculation efficiency compared to acidification.

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Area of Science:

  • Polymer Chemistry
  • Materials Science

Background:

  • Polymer purification is crucial for high-performance materials.
  • Lignin-based copolymers offer sustainable alternatives.
  • Efficient purification methods are needed for lignin-p(AM)-p(DADMAC).

Purpose of the Study:

  • To evaluate laboratory-scale purification techniques for lignin-acrylamide-diallyl dimethylammonium chloride (lignin-p(AM)-p(DADMAC)) copolymers.
  • To compare the efficacy of ethanol extraction, membrane filtration, and acidification.
  • To characterize the impact of purification on polymer properties and performance.

Main Methods:

  • Copolymerization of lignin, acrylamide (AM), and diallyl dimethylammonium chloride (DADMAC).
  • Purification via ethanol extraction, membrane filtration (dialysis), and acidification.
  • Characterization using 1H NMR, solubility tests, thermogravimetric analysis, rheology, and flocculation studies.

Main Results:

  • Ethanol extraction and membrane filtration yielded high-purity lignin-p(AM)-p(DADMAC) with superior yield and solubility.
  • 1H NMR confirmed effective removal of unreacted monomers by membrane dialysis.
  • Purified polymers exhibited enhanced thermal stability (220 °C vs. 160 °C) and superior flocculation performance.

Conclusions:

  • Ethanol extraction and membrane filtration are superior purification methods for lignin-p(AM)-p(DADMAC).
  • Membrane filtration, particularly with larger pore sizes, presents an environmentally friendly purification option.
  • Polymer solubility significantly influences solution viscosity more than molecular weight in this study.