Product useful for joining substrate such as automotive body trim piece, comprises thermo-reversible dry adhesive comprising first layer containing dry adhesive and second layer containing shape memory polymer

摘要

A product (10) comprises a thermo-reversible dry adhesive comprising a first layer (12) containing a dry adhesive; a second layer (14) containing a shape memory polymer; where the thermo-reversible dry adhesive has a first shape at a first temperature and a second shape at a second temperature with a load applied. Independent claims are included for the following: (1) preparing a thermo-reversible dry adhesive containing at least one dry adhesive layer and at least one shape memory polymer layer involving heating the thermo-reversible dry adhesive to a temperature higher than the glass transition temperature of the shape memory polymer layer; imposing a load on the thermo-reversible dry adhesive while cooling to a temperature below the glass transition temperature of the shape memory polymer layer, so that the dry adhesive layer conforms to a corresponding topography of an underlying substrate to form a strong adhesive bond to the underlying substrate; and releasing the thermo-reversible dry adhesive from the underlying substrate by heating the thermo-reversible dry adhesive to a temperature above the glass transition temperature of the shape memory polymer to cause the shape memory polymer to revert to its original shape, and causing the dry adhesive layer to return to its original shape; and (2) forming a thermo-reversible dry adhesive involving forming a first layer by curing a first component, a second component, and a third component; forming a second layer over the first layer involving pouring a mixture of a fourth component and a fifth component over the first layer and curing the second layer; and post-curing the first and second layers to form the thermo-reversible adhesive having a curved structure at a first temperature and having a relatively flat structure at a second temperature with a load applied.