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Thiol-Ene Click Cross-linking of Starch Oleate Films for Enhanced Properties.
- Source :
-
Biomacromolecules [Biomacromolecules] 2023 Dec 11; Vol. 24 (12), pp. 5578-5588. Date of Electronic Publication: 2023 Nov 07. - Publication Year :
- 2023
-
Abstract
- Biobased films were synthesized from starch oleate (DS = 2.2) cross-linked with polyethylene glycol with M <subscript>n</subscript> = 2000 and 1000 g · mol <superscript>-1</superscript> , 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.
Details
- Language :
- English
- ISSN :
- 1526-4602
- Volume :
- 24
- Issue :
- 12
- Database :
- MEDLINE
- Journal :
- Biomacromolecules
- Publication Type :
- Academic Journal
- Accession number :
- 37934174
- Full Text :
- https://doi.org/10.1021/acs.biomac.3c00507