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Kaastra, Gerbrich
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article
Thiol-Ene Click Cross-linking of Starch Oleate Films for Enhanced Properties
Abstract
<p>Biobased films were synthesized from starch oleate (DS = 2.2) cross-linked with polyethylene glycol with M<sub>n</sub> = 2000 and 1000 g · mol<sup>-1</sup>, and ethylene glycol, all of which were esterified with either lipoic acid (LA) or 3-mercaptopropionic acid (MPA). Cross-linking was achieved through a UV-initiated thiol-ene click, and confirmed by Fourier transform infrared spectroscopy and rheometry. The films exhibit higher degradation temperatures, and an increased degree of crystallinity as cross-linker length increased. The introduction of MPA-based cross-linkers resulted in hydrophilic films, while the contact angle was barely affected by the addition of LA-based cross-linkers. A reduction in maximum strength upon introducing the cross-linkers was observed, while an increase in elongation was observed for most of the LA-based cross-linkers. Our results demonstrate the potential for tuning the mechanical and thermal properties of starch-based films through the cross-linker choice, with some formulations exhibiting increased flexibility that may be well suited for packaging applications.</p>