UV induced cross-linking of starch modified with glycidyl methacrylate

Jesper Hedin*, Åsa Östlund, Magnus Nydén

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

A new way to substitute cornstarch with glycidyl methacrylate (GMA) monomers is presented. This synthetic modification, carried out in DMSO, resulted in a DOS of 0.08. By exposing a water solution with modified starch and potassium persulfate (KPS), a radical initiator, to UV-light a free radical vinyl polymerization reaction is initiated making the starch solution chemically cross-link into a gel. The GMA modification increased the hydrophobicity of the polymer making it less water-soluble, increasing the adsorption tendency to a hydrophobic surface as seen in quartz crystal microbalance with dissipation monitoring (QCM-D) studies. The surface cross-linking process of the modified starch showed that after cross-linking the solubility of the polymer decreased resulting in a stronger adsorbed polymer to the surface compared to the non-modified starch. This proves that even though it is generally believed to be more difficult to cross-link polymers at surfaces this particular modification allowed for near complete cross-linking as suggested by the QCM-D data.

Original languageEnglish
Pages (from-to)606-613
Number of pages8
JournalCarbohydrate Polymers
Volume79
Issue number3
DOIs
Publication statusPublished - 11 Feb 2010
Externally publishedYes

Keywords

  • Starch
  • GMA
  • QCM-D
  • Hydrogel
  • UV
  • Cross-linking

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