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Anionic Chain-Growth Polymerization: Overview01:20

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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...

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Preparation of Light-responsive Membranes by a Combined Surface Grafting and Postmodification Process
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Plasma-induced polymerization for enhancing paper hydrophobicity.

Zhaoping Song1, Jiebin Tang, Junrong Li

  • 1Department of Chemical Engineering, University of New Brunswick, Fredericton, NB, Canada. m748i@unb.ca

Carbohydrate Polymers
|December 11, 2012
PubMed
Summary

Plasma-induced grafting of hydrophobic polymers significantly enhanced paper

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Surface Science

Background:

  • Cellulose-based paper is a widely used material, but its inherent hydrophilicity limits its application in moisture-sensitive areas.
  • Developing sustainable and effective methods for surface modification of paper is crucial for expanding its functionalities.
  • Plasma technology offers a versatile, solvent-free approach for surface functionalization.

Purpose of the Study:

  • To investigate the hydrophobic modification of cellulose fibers using plasma-induced polymerization.
  • To graft butyl acrylate (BA) and 2-ethylhexyl acrylate (2-EHA) onto paper surfaces.
  • To evaluate the impact of plasma parameters on the grafting efficiency and resulting hydrophobicity.

Main Methods:

  • Atmospheric cold plasma was utilized to induce polymerization and graft hydrophobic monomers (BA and 2-EHA) onto cellulose fibers.
  • Contact angle measurements were employed to quantify surface hydrophobicity.
  • Fourier Transform Infrared Spectroscopy (FTIR) and X-ray Photoelectron Spectroscopy (XPS) were used to confirm the chemical modification and grafting.
  • Scanning Electron Microscopy (SEM) was used to observe morphological changes on the paper surface.

Main Results:

  • Successful grafting of hydrophobic polymer chains onto cellulose fibers was achieved via plasma-induced polymerization.
  • The hydrophobicity of the modified paper was significantly increased, with water contact angles reaching up to 130°.
  • SEM analysis revealed distinct morphological differences between the modified and unmodified paper surfaces, indicating successful surface alteration.
  • FTIR and XPS confirmed the presence of grafted polymer chains on the cellulose fibers.

Conclusions:

  • Plasma-induced grafting is an effective method for imparting significant hydrophobicity to paper surfaces.
  • The modified paper exhibits enhanced water repellency, making it suitable for applications requiring moisture resistance.
  • This green-based surface modification technique holds promise for developing advanced paper-based packaging materials with improved performance.