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    UV induced cross-linking of starch modified with glycidyl methacrylate

    Year: 2010

    Journal: Carbohydrate Polymers, Volume 79, Issue 3, 11 February 2010, Pages 606-613, 20100827

    Authors: Hedin J., östlund Å., Nydén M.

    Last authors: Magnus Nydén

    Organizations: Department of Chemical and Biological Engineering, Applied Surface Chemistry, Chalmers University of Technology

    Country: Sweden

    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.