How much do you know about the application theory of customized Mastic adhesive!
How much do you know about the application theory of customized Mastic adhesive? Let's learn about it together!
1. Weak boundary layer theory
When the liquid customized Mastic adhesive does not infiltrate the surface of the adherend well, air bubbles remain in the gap and form a weak zone. For another example, when the impurities contained in it can be dissolved in the molten customized Mastic adhesive but not dissolved in the cured customized Mastic adhesive, another phase will be formed in the solidified adhesive, resulting in weakening between the adherend and the customized Mastic adhesive as a whole. Interface layer (WBL). In addition to process factors, in the forming process of polymer network or melt interaction, thermal phenomena such as customized Mastic adhesive and surface adsorption produce inhomogeneity in the boundary layer structure. WBL will appear in the uneven interface layer. The stress relaxation and crack development of this kind of WBL will be different, which greatly affects the overall performance of materials and products.
2. Diffusion theory
On the premise that the two polymers are compatible, when they are in close contact with each other, the phenomenon of mutual diffusion occurs due to the Brownian motion of the molecule or the pendulum of the chain segment. This diffusion effect is interwoven across the interface between the customized Mastic adhesive and the adherend. The result of diffusion leads to the disappearance of the interface and the creation of a transition zone. With the aid of diffusion theory, the bonding system cannot explain the adhesion of polymer materials to metal, glass or other hard bodies, because it is difficult for polymers to diffuse into such materials.
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