The effect of Magnesium resinate complex on the peel strength of polychloroprene-based rubber adhesive

2021 ◽  
pp. 1-18
Author(s):  
Bita Faridi ◽  
Iraj Amiri Amraei ◽  
Hassan Fattahi ◽  
Mahmoud Razavizadeh
Keyword(s):  
Peel Strength

scholarly journals An Assessment of Surface Treatments for Adhesion of Polyimide Thin Films

Polymers ◽  
2021 ◽  
Vol 13 (12) ◽  
pp. 1955
Author(s):  
Marco Cen-Puc ◽  
Andreas Schander ◽  
Minerva G. Vargas Gleason ◽  
Walter Lang
Keyword(s):  
Flexible Electronics ◽  
Oxygen Plasma ◽  
Reactive Ion Etching ◽  
Peel Test ◽  
Scratch Test ◽  
Peel Strength ◽  
Surface Treatments ◽  
Oxygen Plasma Treatment ◽  
Polyimide Films ◽  
Ion Etching

Polyimide films are currently of great interest for the development of flexible electronics and sensors. In order to ensure a proper integration with other materials and PI itself, some sort of surface modification is required. In this work, microwave oxygen plasma, reactive ion etching oxygen plasma, combination of KOH and HCl solutions, and polyethylenimine solution were used as surface treatments of PI films. Treatments were compared to find the best method to promote the adhesion between two polyimide films. The first selection of the treatment conditions for each method was based on changes in the contact angle with deionized water. Afterward, further qualitative (scratch test) and a quantitative adhesion assessment (peel test) were performed. Both scratch test and peel strength indicated that oxygen plasma treatment using reactive ion etching equipment is the most promising approach for promoting the adhesion between polyimide films.

scholarly journals Triblock Copolymer Toughening of a Carbon Fibre-Reinforced Epoxy Composite for Bonded Repair

Polymers ◽  
2018 ◽  
Vol 10 (8) ◽  
pp. 888 ◽  
Author(s):  
Andrew Charles ◽  
Andrew Rider
Keyword(s):  
Fracture Toughness ◽  
Triblock Copolymer ◽  
Peel Strength ◽  
Positive Pressure ◽  
Resin System ◽  
Strength Performance ◽  
Performance Improvements ◽  
Bonded Repair ◽  
Epoxy Resin System ◽  
Bonded Composite

Epoxy resins are the most widely used systems for structural composite applications; however, they lack fracture toughness, impact strength and peel strength due to high cross-linking densities. Use of conventional toughening agents to combat this can lead to reductions in mechanical, thermal and processability properties desirable for bonded composite applications. In this work, an asymmetric triblock copolymer of poly(styrene)–b–poly(butadiene)–b–poly(methylmethacrylate) was used to modify an epoxy resin system, with the materials processed using both vacuum bag and positive pressure curing techniques. Interlaminar fracture toughness testing showed improvements in initiation fracture toughness of up to 88%, accompanied by a 6 °C increase in glass transition temperature and manageable reductions in gel-time. Shear testing resulted in a 121% increase in ultimate shear strain with only an 8% reduction in shear strength. Performance improvements were attributed to nano-structuring within the toughened resin system, giving rise to matrix cavitation and dissipation of crack front strain energy upon loading.

scholarly journals Effects of temperature on interfacial evolution and mechanical properties of pure titanium and carbon steel sheets bonded via new multi-pass continuous hot-roll diffusion with nickel interlayer

2021 ◽  
Author(s):  
Chun-Ming Jimmy Lin ◽  
Mohsen Saboktakin Rizi ◽  
Chia-Kai Chen
Keyword(s):  
Mechanical Properties ◽  
Carbon Steel ◽  
Pure Titanium ◽  
Engineering Application ◽  
Peel Strength ◽  
Processing Temperature ◽  
Diffusion Treatment ◽  
Steel Sheets ◽  
New Type ◽  
Interfacial Evolution

Abstract This study performed experiments and thermodynamic calculations to elucidate the effects of diffusion temperature on interfacial evolution and mechanical properties of pure titanium and carbon steel (i.e., steel) sheets bonded via a new type of multi-pass continuous hot-roll diffusion with nickel interlayer. The interfacial evolution results revealed that this new type of multi-pass continuous hot-roll diffusion treatment showed a very good adherence due to its metallurgy bonding, because it made a remarked improve to between compound and intermetallic compounds relationship. Secondly, in mechanical properties results revealed that the highest shear strength (∼470 MPa) was obtained at a processing temperature of 850°C. The highest peel strength (∼21 N/mm) was obtained in the sample processed at 900°C. Bonding temperatures above and below these levels reduced the bond strength respectively due to poor atom diffusion and excessive compound formation, resulting in joint failure at the Ti-Ni interface. Extensive cleavage planes with various alignments were observed on the fracture surfaces in these cases. Overall, a hot-rolling temperature of 850°C was found to provide the optimal tradeoff between interfacial bonding strength and ductility. This work provided an economical and convenient solution for broadening the engineering application of interface between sheets of pure titanium and steel.

scholarly journals P049 SAFETY AND EFFICACY OF ABSORBABLE AND NON-ABSORBABLE FIXATION SYSTEMS FOR INTRAPERITONEAL MESH FIXATION: AN EXPERIMENTAL STUDY IN SWINE

2021 ◽  
Vol 108 (Supplement_8) ◽  
Author(s):  
Spyridon Kapoulas ◽  
Apostolos Papalois ◽  
Georgios Papadakis ◽  
Georgios Tsoulfas ◽  
Emmanouil Christoforidis ◽  
...  
Keyword(s):  
Abdominal Wall ◽  
Mesh Fixation ◽  
Peel Strength ◽  
Swine Model ◽  
Abdominal Wall Defects ◽  
Hernia Surgery ◽  
Safety And Efficacy ◽  
Mesh Placement ◽  
Intraperitoneal Mesh ◽  
Mesh Shrinkage

Abstract Aim Choice of the best fixation system in terms of safety and effectiveness for intraperitoneal mesh placement in hernia surgery remains controversial. The aim of this study was to compare the performance of four fixation systems in a swine model of intraperitoneal mesh fixation. Material and Methods Fourteen Landrace swine were utilized and the experiment included two stages. Initially, four pieces of polypropylene mesh with hydrogel barrier coating1 were fixed intraperitoneally to reinforce 4 small full thickness abdominal wall defects created with diathermy. Each mesh was anchored with a different tack device between titanium2, steel3 or absorbable (4,5) fasteners. The second stage took place after 60 days and included euthanasia, laparoscopy, and laparotomy. The primary endpoint was to compare the peel strength of the compound tack/mesh from the abdominal wall. Secondary parameters were the extent and quality of visceral adhesions to the mesh, the degree of mesh shrinkage and the histological response around the tacks. Results Thirteen out of 14 animals survived the experiment and 10 were included in the final analysis. Steel tacks had higher peel strength when compared to titanium and absorbable fasteners. No significant differences were noted regarding the secondary endpoints. Conclusions Steel fasteners provided higher peel strength that the other devices in this swine model of intraperitoneal mesh fixation. Our findings generate the hypothesis that this type of fixation may be superior in a clinical setting. Clinical trials with long-term follow-up are required to assess the safety and efficacy of mesh fixation systems in hernia surgery.

Adhesion and Electrical Insulation of Thin Polymeric Coatings Under Saline Exposure

1987 ◽  
Vol 110 ◽  
Author(s):  
R. N. Leyden ◽  
D. I. Basiulis
Keyword(s):  
Barrier Properties ◽  
Peel Strength ◽  
Polymer Coatings ◽  
Polymeric Coatings ◽  
Adhesive Failure ◽  
Short Term ◽  
Leakage Currents ◽  
Electrical Bias ◽  
Implanted Devices

AbstractA study was made of the adhesion of insulating polymer coatings under long term exposure to electrical bias. Since a common mode of failure in implanted devices is the penetration of water into poorly adhering insulation/conductor interfaces followed by electrolytic degradation, development of processes, primers, and insulators with good adhesion that resist the effects of water were sought. Polyimide coatings were tested for their ion barrier properties by immersion of insulated comb patterns in saline with 9 V D.C. bias between the comb fingers. Leakage currents, measured over three years exposure, increased from several picoamps initially to several nanoamps in surviving specimens. Subsequent studies showed that dramatic improvements in the moisture durability of the adhesion could be obtained using Hitachi's aluminum chelate type primer. Whereas the peel strength of polyimide on unprimed platinum fell more than 90% after several hours of boiling saline exposure, the peel strength of polyimide coatings on primed surfaces remained at over 80% of their initial values. ESCA analysis of the peel interfaces showed that both aluminum oxide and polyimide remain on the substrate after peeling back the polyimide. This suggests a combination of cohesive and adhesive failure at the primer/polyimide interface. The effects of exposure of the polymer/substrate interfaces (edges) to saline and electrochemical stress were examined by patterning circular openings in the polyimide. A 10 V anodic potential was found to damage adhesion to titanium as far as 75 microns away from the edge. Pulsing at 500 Hz, 1 V peak to peak was found to have no measurable effect in the short term.

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