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Tensile Properties of Polyacrylamide-Gelatin/Calcium Carbonate and Polyacrylamide-Chitosan/Alginic Acid Double Network Hydrogels

Nurul Atika Mohd Amer, Nur Farizah Ayub, Nur Amanina Khalid, Jamarosliza Jamaluddin, Nadia Adrus


Double network (DN) hydrogels have drawn considerable attention as innovative materials possessing both high water content as well as improved mechanical properties. In this study, DN hydrogels were formed from a combination of two  hydrogel networks. The first network composed of acrylamide (AAm) and N’,N’-methylenebisacrylamide (MBAAm). AAm and MBAAm were covalently crosslinked via photopolymerization simultaneously with/without  the presence of the second network pre-gel mixture i.e: physically crosslinked gelatin-calcium carbonate (GCa) or chitosan-alginic acid (CAA). The mechanical properties characterization of the hydrogels revealed that tensile strength, Young’s modulus and elongation at break increased with the increasing amount of second network component; i.e. GCa and CAA. These data could confirmed that the DN hydrogels possessed ‘stretchability’ character. Overall, PAAm-GCa and PAAm-CAA DN hydrogels had shown better mechanical strength than the PAAm single network hydrogels. We foreseen that DN hydrogels are highly potential to be developed as artificial muscles.


Double network, Polyacrylamide hydrogel, Gelatin-calcium carbonate solutions (GCa), Chitosan-alginic acid (CAA)

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