Skip to main content
U.S. Department of Energy
Office of Scientific and Technical Information

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
 [1];  [1];  [1];  [1];  [2];  [2];  [2];  [2];  [1]
  1. Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
  2. 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

References (35)

Effects of surface modification by oxygen plasma on peel adhesion of pressure-sensitive adhesive tapes journal January 2000
Investigations on the reactive surface modification of polycarbonate by surface‐reactive injection molding journal May 2004
Joining processes of CFRP‐Al sheets in automobile lightweighting technologies: A review journal October 2022
Migration studies and chemical characterization of low molecular weight cyclic polyester oligomers from food packaging lamination adhesives journal January 2018
Comparison between XPS- and FTIR-analysis of plasma-treated polypropylene film surfaces journal January 2008
Advances in joining technology of carbon fiber-reinforced thermoplastic composite materials and aluminum alloys journal September 2020
Influence of pre-treatment using non-thermal atmospheric pressure plasma jet on aluminum alloy A1050 to PEEK direct joining with hot-pressing process journal December 2023
Reactivite du dicyandiamide vis a vis des groupements O et N-epoxyde—1. Mecanisme reactionnel journal January 1991
Thermal and thermo-oxidative ageing of an epoxy adhesive journal May 2000
Migration of cross-linking agents to the surface during ageing of a structural epoxy adhesive journal January 2003
Failure mode and ageing of steel/epoxy joints journal September 1998
Interaction of amines with native aluminium oxide layers in non-aqueous environment: Application to the understanding of the formation of epoxy-amine/metal interphases journal August 2008
Surface chemistry and composition-induced variation of laser interference-based surface treatment of Al alloys journal September 2019
Plasma treatment on both adhesive tape and adherends for significantly enhanced CFRTP-related adhesive joints journal March 2024
Mode I tensile fracture behavior of adhesively-bonded metal–metal, metal–CFRP, and CFRP–CFRP bi-material combinations analyzed by size effect method journal September 2022
How pure mode I can be obtained in bi-material bonded DCB joints: A longitudinal strain-based criterion journal November 2018
Effect of atmospheric pressure plasma treatment on surface physicochemical properties of carbon fiber reinforced polymer and its interfacial bonding strength with adhesive journal October 2020
A review of experimental and theoretical fracture characterization of bi-material bonded joints journal February 2021
Significant slowdown of plasma-optimized surface energy deactivation by vacuum sealing for efficient adhesive bonding journal July 2022
Plasma surface modification coupled with thermal and step-over distance effects on significant fracture improvement of adhesively-bonded metal-CFRTP dissimilar materials journal February 2023
Effect of atmospheric plasma treatment on Mode-I and Mode-II fracture toughness properties of adhesively bonded carbon fiber/PEKK composite joints journal September 2023
Migration studies and toxicity evaluation of cyclic polyesters oligomers from food packaging adhesives journal May 2020
Chemical pretreatment and adhesive bonding properties of high-pressure die cast aluminum alloy: AlSi10MnMg journal September 2015
Influence of atmospheric pressure plasma process parameters on the mechanical behavior of thermoplastic joints journal October 2020
A study of adhesive bonding in metal–metal, metal–CFRP, and CFRP–CFRP material combinations under shear deformation: Fracture morphologies and damage mechanisms journal October 2023
Recent advances in wet adhesives: Adhesion mechanism, design principle and applications journal May 2021
The Effect of a Silane Coupling Agent on the Hydrolytic Durability of Thin Epoxy Resin Films journal September 2001
Mechanisms of Formation of the Interphase in Epoxy-Amine/Aluminium Joints journal July 2012
Hybrid and adhesively bonded joints with dissimilar adherends: a critical review journal December 2020
Polymer-fiber-reinforced polymers with enhanced interfacial bonding between polypropylene fiber and polyethylene matrix journal September 2024
Assessment of dissimilar joining between metal and polymer hybrid structure with different joining processes journal September 2021
Polymer System Based on Polyethylene Glycol and TFE Telomers for Producing Films with Switchable Wettability journal April 2024
Adhesive Joints with Laser Shaped Surface Microstructures journal December 2021
Effect of Atmospheric Pressure Plasma Treatment on Adhesive Bonding of Carbon Fiber Reinforced Polymer journal January 2019
The Interaction of Waterborne Epoxy/Dicyandiamide Varnishes with Metal Oxides journal May 2022