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. 2021 Oct 15;13(20):3561.
doi: 10.3390/polym13203561.

Structural Adhesives Tapes Based on a Solid Epoxy Resin and Multifunctional Acrylic Telomers

Mateusz Weisbrodt  1 , Agnieszka Kowalczyk  1 , Krzysztof Kowalczyk  1
Affiliations

Structural Adhesives Tapes Based on a Solid Epoxy Resin and Multifunctional Acrylic Telomers

Mateusz Weisbrodt et al. Polymers (Basel). .

Abstract

Thermally curable pressure-sensitive structural adhesives tapes (SATs) were compounded using a solid epoxy resin and multifunctional acrylic telomer solutions (MATs) prepared by a thermally initiated telomerization process in an epoxy diluent containing two kinds of telogens (CBr4 or CBrCl3). Dynamic viscosity, K-value, and volatile mater content in MATs (i.e., MAT-T with CBr4, MAT-B with CBrCl3) were investigated in relation to telogen type and content. The influence of MATs on the self-adhesive features and curing behavior of UV-crosslinked tapes as well as on the shear strength of thermally cured aluminum-SAT-aluminum joints was investigated as well. Increasing the telogen dose (from 5 to 15 wt. parts) caused significant improvement in the adhesion (+315% and +184%), tack (+147% and +298%), and cohesion (+414% and +1716%) of SATs based on MAT-T and MAT-B, respectively. Additionally, MATs with high telogen content (especially the MAT-T-type) improved the resistance of cured joints to aviation fuel, humidity, and elevated temperature. The highest overlap shear strength values were registered for SATs based on MATs containing 7.5 wt. parts of CBr4 (16.7 MPa) or 10 wt. parts of CBrCl3 (15.3 MPa).

Keywords: acrylic monomers; epoxy resins; mechanical properties; structural adhesives; telomerization; thermoset polymers.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Theoretical chemical structures of the monomers, telogens, and acrylic telomers (MAT-T with tetrabromomethane; MAT-B with bromotrichloromethane).
Figure 2
Figure 2
K-values of multifunctional acrylic telomer solutions in relation to the type and dose (by weight or moles) of the telogens.
Figure 3
Figure 3
DSC thermographs for MAT-T (a) and MAT-B solutions (b).
Figure 4
Figure 4
Preparation steps of UV-crosslinked SATs and thermally cured SATs.
Figure 5
Figure 5
DSC thermographs for UV-crosslinked SATs based on MAT-T (a) or MAT-B (b).
Figure 6
Figure 6
Adhesion to steel (a), tack (b), and cohesion (c) of SATs in relation to the type and content of their telogens.
Figure 7
Figure 7
Overlap shear strength (before and after aging tests) of Al/SAT/Al joints based on MAT-T (a) and MAT-B (b).
Figure 8
Figure 8
Storage module (a,b), loss module (c,d), and tan delta (e,f) for thermally cured SATs based on MATs.
Figure 8
Figure 8
Storage module (a,b), loss module (c,d), and tan delta (e,f) for thermally cured SATs based on MATs.
See this image and copyright information in PMC

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