Light-Induced Reworkable Adhesives Based on ABA-type Triblock Copolymers with Azopolymer Termini

ACS Applied Materials & Interfaces
Shotaro ItoHideyuki Kihara

Abstract

Photocurable adhesives based on polymers and resins are an integral part of different production processes because of their fast curing and local area bonding ability. Recently, dismantlable adhesives have attracted a lot of attention for recycling adherends or replacement of adhesion defects. However, adhesives that allow repeatable bonding and debonding solely by light irradiation, i.e., without heat activation, are lacking. Here, ABA-type triblock copolymers consisting of poly(meth)acrylates bearing an azobenzene moiety (A block) and 2-ethylhexyl (B block) side chains were synthesized and utilized as photocurable adhesives. In contrast to the azo homopolymers, the block copolymer structure and incorporation of the soft middle block actualized a low concentration of the azobenzene moiety and consequently, higher flexibility of the resultant copolymers. This enabled film formation of the azobenzene-based adhesives and light-induced bonding for the first time. On the basis of the photoisomerization of the azobenzene moiety, changes in their viscoelastic property, i.e., softening and hardening, were induced by UV irradiation at 365 nm (50-100 mW cm-2) and green light irradiation at 520 nm (40 mW cm-2), respectively. In fact, two...Continue Reading

References

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Apr 1, 2015·Chemical Science·Kelly A HoutonAndrew J Wilson

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Citations

Jun 12, 2019·Advanced Materials·Takuya OhzonoEugene M Terentjev
Aug 13, 2021·ACS Applied Materials & Interfaces·Mioka KoikeTakahiro Yamamoto
Nov 14, 2019·ACS Applied Materials & Interfaces·Xin WangLongjian Xue
Jun 20, 2020·ACS Applied Materials & Interfaces·Luuk KortekaasBart Jan Ravoo

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