Toughness and Durability of Interfaces in Dissimilar Adhesive Joints of Aluminum and Carbon-Fiber-Reinforced Thermoplastics

Lyu, Lingyun; Ohnuma, Yoshino; Shigemoto, Yuri; Hanada, Takeshi; Fukada, Tamaki; Akiyama, Haruhisa; Terasaki, Nao; Horiuchi, Shin

doi:10.1021/acs.langmuir.0c02628

Cited by 17 publications

(10 citation statements)

References 33 publications

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“…Until now, a number of experimental studies on various adhesion interfaces have been carried out. , Experimentally, the adhesive strength is measured using procedures like tensile, shear, and wedge tests. − Scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-ray analysis (EDX), and X-ray photoelectron spectroscopy (XPS) have been used to characterize the morphology and the chemical composition of the adhesion interface . Designed surface topography facilitates the investigation of the effects of the morphological changes of the surface on the adhesion strength …”

Section: Introductionmentioning

confidence: 99%

Theoretical Study on the Adhesion Interaction between Epoxy Resin Including Curing Agent and Plated Gold Surface

et al. 2021

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In this study, the adhesive interaction between gold and epoxy resin is theoretically investigated. These materials make up crucial components of a wide range of electronic devices. The objectives of the study are (1) to elucidate the bonding mechanism between epoxy resin and a realistic gold surface, and (2) to obtain a device-design guideline for superior adhesion, thus reducing the bonding breakage that may potentially cause device failure. Die pad surfaces used in chip attachment methods for microelectronics are usually fabricated using an electrolytic plating technique. This technique involves ionic gold solutions like K[Au(CN) 2 ]. The combined theoretical and experimental studies previously carried out by the authors have revealed that the CN − counteranion of the gold cation has a high affinity for gold and is likely to remain on the realistic gold surface generated by plating. However, the cyano group content on the surface of the plated gold is still unknown. Therefore, gold surfaces embedded with cyano groups with various coverages are constructed. The effect of the varying coverage of the cyano groups on the adhesion strength is inspected using firstprinciples density functional theory calculations. As the number of cyano groups on the surface increases, the direct interaction between the gold surface and the epoxy resin is hindered, but the hydroxy and amino groups in the epoxy resin and hardener form more hydrogen bonds with the cyano groups adsorbed on the surface. It is found that the surface with intermediate cyano coverage (about 33%) yields the highest adhesive strength.

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Section: Introductionmentioning

confidence: 99%

Theoretical Study on the Adhesion Interaction between Epoxy Resin Including Curing Agent and Plated Gold Surface

et al. 2021

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“…The chemical reaction of the adhesive creates covalent and hydrogen bonds, resulting in durable bonding. However, this bonding process is limited to certain materials owing to chemical affinities; moreover, it may be complicated and harmful. − In lieu of chemical bonding, physical bonding involving microstructures and nanostructures created on metal surfaces has been proposed to enhance metal–polymer adhesion. − First, molten polymer fills the formed structures; subsequently, the hardened polymer forms metal–polymer joints through mechanical interlocking. To form strong joints, mechanical interlocking should be improved.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Steel Sandwich Sheet Adhesion Using Mechanical Interlocking Structures Formed by Electrochemical Etching

Kim

Yoo

et al. 2021

Langmuir

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Steel sandwich sheets (steel−polymer−steel), which are composed of lightweight polymers bonded on both sides with rigid steel sheets, have recently been developed as functional lightweight materials. In this study, a steel sandwich sheet (electrogalvanized (EG) steel sheet−polypropylene (PP)−EG steel sheet) with improved normal adhesion is fabricated without adhesives. Instead, adhesion is achieved via mechanical interlocking between the etched EG steel sheets and PP. Hierarchical structures were formed on the EG steel sheet surface by electrochemical etching to attain effective mechanical interlocking for improving normal adhesion without any adhesives. In the case of the EG steel sheet etched at 6 V for 7 s, a high fraction (∼35%) of holes (size: <1 μm 2 ) with nanoscale scalloped structures was formed on the EG steel sheet surface. The normal adhesion test result of the fabricated steel sandwich sheet showed that the adhesion strength increased from virtually 0 (bare) to 559.6 kPa as a result of mechanical interlocking. The results of the focused ion beam−scanning electron microscopy and energy-dispersive spectrometry analyses confirmed the cohesive failure of PP resulting from the successful mechanical interlocking of PP with the holes formed on the etched EG steel sheet. To examine the effect of hierarchical structures on the normal adhesion of the steel sandwich sheet, finite element analysis was implemented.

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“…The bonding strength of adhesives can be measured using various techniques such as peel tests, lap shear strength (LSS) tests, or double cantilever beam (DCB) tests. − Peel tests can only be performed on flexible substrates, whereas the LSS and DCB tests are suitable for rigid substrate materials. Although the DCB test method has been developed to obtain a deeper insight into the fundamental adhesion mechanism, the LSS test is a more common and standardized technique, which made it our method of choice.…”

Section: Resultsmentioning

confidence: 99%

Unprecedented Adhesive Performance of Propylene-Based Hydroxyl-Functionalized Terpolymers

Kruszynski

Nowicka

Bouyahyi

et al. 2023

ACS Appl. Polym. Mater.

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The synthesis of hydroxyl-functionalized propylenebased terpolymers and their performance as hot melt adhesives were investigated. The products comprise uniformly distributed butyl and 4-hydroxyl-butyl branches along the polypropylene backbone. Despite the low hydroxyl-functionality level of ≤ 0.5 mol %, hydroxyl-functionalized terpolymers show formidable adhesion to aluminum and steel, providing an adhesive strength exceeding 16 MPa, whereas the nonfunctionalized congeners hardly adhere to these metals. As evidenced by rheological measurements, the functional groups form dynamic crosslinks based on hydrogen bonding and electrostatic interactions with aluminum oxide hydroxide residues, remaining in the product after polymerization. At the industrial application temperature of 180 °C, nondeashed and deashed samples of polymers having 0.1 or 0.5 mol % incorporated 5-hexen-1-ol gave, upon cooling to room temperature, comparable adhesive strengths. Deashing and increasing the functionality level lead to a significant improvement of the adhesion strength at a lower application temperature (130 °C), allowing application of the hydroxyl-functionalized propylene-based terpolymers as high-strength hot melt adhesives for combinations of polypropylene and metals.

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Toughness and Durability of Interfaces in Dissimilar Adhesive Joints of Aluminum and Carbon-Fiber-Reinforced Thermoplastics

Cited by 17 publications

References 33 publications

Theoretical Study on the Adhesion Interaction between Epoxy Resin Including Curing Agent and Plated Gold Surface

Theoretical Study on the Adhesion Interaction between Epoxy Resin Including Curing Agent and Plated Gold Surface

Enhancement of Steel Sandwich Sheet Adhesion Using Mechanical Interlocking Structures Formed by Electrochemical Etching

Unprecedented Adhesive Performance of Propylene-Based Hydroxyl-Functionalized Terpolymers

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