The effect of the properties and thickness of the high temperature tape adhesive

by:CROWN     2021-11-10

High temperature tapes are still not well understood by many people, so as far as possible, we can popularize more common sense about high temperature tapes for us. Below, let us introduce the properties and thickness of high temperature tape adhesives.

The thermoplastic polymer of the high-temperature tape has poor branching flexibility, and the cross-linked three-dimensional network structure is not easy to deform after being tensioned, and the acceptable load is also higher. Thermoplastic polymers have no cross-linked bonds between the molecules. Under the effect of external force, the macromolecular chain deforms and the molecules move slowly relative to each other, showing creep. Its growth rate is higher than that of thermosetting polymers, but the acceptable load is not high.

The elastomer material of high-temperature tapes, because the polymer molecule contains many flexible segments, it is easy to produce reversible deformation under the effect of external force. The creep deformation of thermoplastics and the elastic deformation of elastomers, to a certain extent, reduce the stress concentration of the specimen under the effect of shearing force and ease the degree of linear effect force on the bonding edge of the specimen. Low-molecular-weight thermoplastic resins and polyethylene polymer adhesives have a high deformation rate without cracking under the effect of external force, but the acceptable load is lower.

The adhesive thickness of the high temperature tape in the lap joint directly affects the shear strength of the joint. Generally speaking, an increase in the thickness of the adhesive is accompanied by a decrease in the shear strength of the joint. However, it is not that the thickness of the adhesive is as thin as possible. The too-thin adhesive layer is prone to lack of glue, and the lack of glue becomes the defect of the adhesive film. When force is applied, the stress around the defect is easy to gather, which accelerates the break of the adhesive film. The appropriate thickness of the adhesive depends on the shape of the bonding head, the type of load, and the excipients of the adhesive.

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