Physicochemically tunable hyperbranched glycerol copolymerized with functional aziridine as a versatile, multivalent crosslinker for waterborne acrylic adhesives
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Waterborne adhesives are increasingly investigated for coating and adhesives due to its eco-friendly composition and low volatile organic compounds (VOCs). However, waterborne adhesives had limitation on its applications because it has lower mechanical strength and moisture resistance compared to common adhesives. To control the property of waterborne adhesives, developing crosslinkers that have capability to control the crosslinking density in a wide range with multivalent functional groups as well as tunable physical properties possessing miscibility between water and adhesive polymers could be a solution. Herein, multifunctional polymeric crosslinker for waterborne acrylic adhesive is developed by functionalizing acrylic hyperbranched polyglycerol (HPG) with various functional moieties via aziridine linkage (‘F-AziAHPG’). Mechanical and adhesive properties demonstrate the complex tuning of adhesion and cohesion of the waterborne acrylic adhesives by F-AziAHPG crosslinkers.