Also, the OWMS, containing aldehyde groups, forms covalent bonds with zein, whereas WMS only provides H-bonding. While their rougher surface enhances the resin-MC mechanical bonding, higher aspect ratio increases the probability of MC being in the path of microcracks. A novel method combining co-axial injection and emulsion-solvent evaporation technique was developed to fabricate multi-geometrical MCs with aspect ratios greater than 1. Self-healing ‘green’ thermoset zein resin was developed using elongated multi-geometrical poly (D,L-lactic-co-glycolic acid) (PLGA) microcapsules (MCs) containing waxy maize starch (WMS) or oxidized WMS (OWMS) as healing agents.
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