Functional group activation and coupling agent migration induced by plasma treatment in adhesive for enhanced toughness of metal-composite joints
Journal Article
·
· Progress in Organic Coatings
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
- General Motors Technical Center, Warren, MI (United States)
Commercial adhesive paste was additionally activated using low-power oxygen plasma with different plasma exposure durations to investigate its interfacial bonding contribution in adhesively-bonded Aural-5/CFRP-PA6 double cantilever beam (DCB) joints with plasma-treated adherends. The plasma-treated adhesive showed enhanced functional peak intensities in Fourier transfer infrared spectroscopy (FTIR) as plasma exposure time was increased, and some degree of oxidation was also detected via X-ray photoelectron spectroscopy (XPS). A small molecule, dicyandiamde (coupling agent) in adhesive was migrated to adhesive layer, where double concentration of coupling agent was detected after 10 minutes of plasma treatment. As a result, characterization of the adhesive/CFRP-PA6 interface after DCB fracture showed additional chemical bonds formed through amine-initiated epoxy ring opening polymerization, as well as amide bonds and ester bonds. In conclusion, these additional bonds at the adhesive/CFRP-PA6 interfaces led to significantly increased failure extensions and fracture energies of the joints as the plasma exposure time on the adhesive increased, compared to the joints with plasma-treated adherends but non-plasma-treated adhesive as commonly seen in the literature.
- Research Organization:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Vehicle Technologies Office (VTO)
- Grant/Contract Number:
- AC05-76RL01830
- OSTI ID:
- 2564356
- Report Number(s):
- PNNL-SA--204316
- Journal Information:
- Progress in Organic Coatings, Journal Name: Progress in Organic Coatings Vol. 200; ISSN 0300-9440
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Similar Records
Plasma surface modification coupled with thermal and step-over distance effects on significant fracture improvement of adhesively-bonded metal-$\mathrm{CFRTP}$ dissimilar materials
Significant slowdown of plasma-optimized surface energy deactivation by vacuum sealing for efficient adhesive bonding
Journal Article
·
Mon Nov 07 19:00:00 EST 2022
· Composites Science and Technology
·
OSTI ID:1902625
Significant slowdown of plasma-optimized surface energy deactivation by vacuum sealing for efficient adhesive bonding
Journal Article
·
Sun May 29 20:00:00 EDT 2022
· Composites. Part B, Engineering
·
OSTI ID:1872724