Thermally stimulated bio-acrylate based detachable adhesives with sustainable bonding-debonding design

Abstract

The electronics and automotive industries utilize acrylic adhesives extensively. Their exceptional mechanical strength, accompanied by their permanent nature, renders recycling impracticable. Present work has successfully synthesized acrylate biopolymer based detachable adhesive, which is both eco-friendly and sustainable. Glycerol, from mustard oil, was oxidatively-dehydrated to synthesize acrylic acid, which along with dimethyl glyoxime was chain polymerized to obtain an eco-friendly acrylic based hot melt detachable adhesive (AAHMDA). Mechanical strength of prepared adhesive was tested through thermo-mechanical bonding-debonding cycles on glass, wood, and metal. In three tests of 0.2 g adhesive against specific applied stress on all surfaces, metal (1494.49 N/m²) and wood (1851.17 N/m²) remained intact for 2 h and 30 min. Maximum cleavage stress (applied weight) on glass, wood, and metal slides, using 0.2 g adhesive, was found to be 26503.61 N/m² (1200 g), 19824.71 N/m² (950 g), and 26328.24 N/m² (1300 g), respectively, when repeatedly tested for 15 cycles. Gel contents and water absorption capacity of sample were found at 99.79 % and 38.78 %, respectively. Prepared AAHMDA possesses the capability to create a robust mechanical bond that is readily detachable when heated, which makes it a cost effective adhesive. Owing to its strong bonding and simple detachment procedure, AAHMDA appears to have a promising future in materials research, sustainability initiatives, and changing industry demands.