The chemical composition of glue, the polymer in the water environment glue (vinyl acetate in white glue is a kind of petroleum derivatives) are round particles, the radius of the general particle is between 0.5~5μm.The bonding of objects is achieved by the tension between the polymers in the glue.In the glue, water is the carrier of the polymer, and the water carries the polymer slowly into the tissue of the object.When the moisture in the glue disappears, the polymer in the glue depends on the pull force between each other, tightly combining two objects together.In the use of glue, too much glue will make the polymer in the glue crowded together; Polymers do not produce very good tension between them.The polymers crowd each other so they don't form the strongest attraction to each other.At the same time, the water between polymers is not easy to volatilize.This is why "the thicker the film, the worse the felting effect of the glue" during the bonding process.If the amount of glue is too much, the glue plays a "filling effect" rather than a bonding effect. The bonding between objects depends on the "cohesion" of glue rather than the bonding force of glue.

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