Adhesion Theories and Effect of Surface Roughness on Energy Estimation and Wettability of Polymeric Composites Bonded Joints: A-Review

Adhesive bonding is getting more attention for research and considered as most promising and well-known technique for joining the two materials which may be similar or dissimilar naturally polymers, metals etc. and to be utilized in light weight structures for reduced stress distribution. Adhesion bonding consisting on intrinsic bonding force which plays vital role to make the joint withstand more strength. To fabricate an effective griped joint between the components, good adhesion strength is compulsory attainment factor for long life of structures. Recently, along with metallic materials polymers and their composites are also trending in multiple industries. All materials always have forces of attraction between their atoms/molecules which extremely crucial role to ensure stronger bond strength and often dependent on roughness of surface of material which are taking part to fabricate the joint. Consequently, surface roughness and surface morphology are most important parameters to decide the joint strength and life of bonded joints of polymeric composites. In this review article, mechanical interlocking mechanism, surface roughness effects on wettability, surface energy estimation and various bonding theories including adsorption theory, diffusion theory, boundary layer theory and chemical theory are discussed briefly to emphasize the various technological & industrial developments.