Development and application of stretchable nano-adhesive for lamination of various soft substrates via initiated chemical vapor deposition (iCVD) inducing interpenetrating polymer network (IPN)

Abstract

To achieve adhesion between two arbitrary soft substrates, a curable nano-adhesive was developed via iCVD process. The nano adhesive is a copolymer of allyl glycidyl acrylate(AGE) and 2-hydroxyethyl acrylate(HEA) which was designed epoxy ring open reaction by hydroxyl group. pAH2 which was optimized by adhesion and solvent resistance test has 393 % stretchability with 87.5 kPa elastic modulus after annealing. Also, synthesized adhesive has high transmittance and excellent adhesion by only 500 nm thickness. By vapor deposition method, interpenetrating polymer network(IPN) was created between soft substrate and pAH2. Compared to commercial stretchable adhesives which were silbione and 3M VHB tape, pAH2 shows distinctly strong adhesion with structural failure. By crosslinking formation, adhesion between PDMS and eco-flex was 4.6 N/cm and maintained up to 90 % value after stretching test (30 % strain, 10^5 time) and solvent test (saline solution, 38 ℃ 1 week).