Effect of Cold Plasma Treatment on Surface Roughness and Bonding Strength of Polymeric Substrates

2014 ◽  
Vol 611-612 ◽  
pp. 1484-1493 ◽  
Author(s):  
Chiara Mandolfino ◽  
Enrico Lertora ◽  
Carla Gambaro
Keyword(s):  
Surface Roughness ◽  
Plasma Treatment ◽  
Bonded Joints ◽  
Plasma Process ◽  
Adhesive Properties ◽  
Low Surface Energy ◽  
Lap Shear ◽  
General Terms ◽  
Polymeric Substrates ◽  
Adhesive Bonded Joints

For an effective application of polymers, it is essential to have good adhesion behaviour to ensure good mechanical properties and durable components. Unfortunately, in general terms, polymers are characterized by high chemical inertness, which leads to very low surface energy values and, consequently, poor adhesive properties; this is particularly true for polyolefins. In this study, the effects of low pressure plasma treatment on surface roughness of polyethylene and polypropylene samples and on shear properties of adhesive bonded joints based on these substrates have been investigated. In particular, the optimization of three plasma process parameters, exposure time, voltage and working gas, were studied performing roughness measurement, contact angle evaluation and lap-shear tests. The experimental results show that the optimized plasma process may remarkably change the surface morphology, increasing wettability properties of the surfaces and shear strength of the bonded joints. These good properties remain almost unchanged even after some days of storage in the laboratory.

Influence of Filler Amount and Content on the Mechanical Performance of Joints Bonded with Metal Powder Filled Adhesive

2013 ◽  
Vol 773-774 ◽  
pp. 226-233
Author(s):  
Nergizhan Kavak ◽  
Erhan Altan
Keyword(s):  
Surface Roughness ◽  
Mechanical Strength ◽  
Shear Test ◽  
Mechanical Performance ◽  
Bonded Joints ◽  
Aluminium Powder ◽  
Lap Shear ◽  
Lap Shear Test ◽  
Adhesive Bonded Joints ◽  
Single Lap Shear Test

The objective of this study is to investigate the surface roughness that effect the capability of adhesive with adding aluminium powder and 63/37 Sn-Pb soft solder powder to the epoxy to increase the mechanical strength of joints. The adhesive strength of the joints was determined by utilizing the single-lap shear test. As seen from the experiments, the surface roughness has an important effect on the strength of adhesive bonded joints. Experimental results show that joints prepared by adhesive which was modified, adding in the amount of 5 wt% 63/37 Sn-Pb powder have more mechanical strength than joints compared to one which is prepared by adding aluminium powder with different ratios as 5, 25,50 wt%.

Effect of plasma treatment and electron beam radiations on the strength of nanofilled adhesive-bonded joints

2010 ◽  
Vol 50 (8) ◽  
pp. 1505-1511 ◽  
Author(s):  
H.M.S. Iqbal ◽  
S. Bhowmik ◽  
J.A. Poulis ◽  
R. Benedictus
Keyword(s):  
Electron Beam ◽  
Plasma Treatment ◽  
Bonded Joints ◽  
Adhesive Bonded Joints

Effect of Surface Pretreatment on the Performance of Adhesive-Bonded Joints

2013 ◽  
Vol 554-557 ◽  
pp. 996-1006 ◽  
Author(s):  
Chiara Mandolfino ◽  
Enrico Lertora ◽  
Carla Gambaro
Keyword(s):  
Surface Roughness ◽  
Mechanical Characteristics ◽  
Steel Substrate ◽  
Impact Angle ◽  
Systematic Investigation ◽  
Epoxy Adhesive ◽  
Bonded Joints ◽  
Variable Parameters ◽  
Surface Pretreatment ◽  
Adhesive Bonded Joints

This paper presents a systematic investigation of the influence of sandblasting pretreatment parameters on the surface roughness and mechanical characteristics of adhesive-bonded joints. The preliminary surface treatment in a bonding process has two important aims: first of all, it eliminates contaminants (dust, grease, humidity and corrosion products) which can modify the wettability of the substrate, then it increases surface roughness and, consequently, the contact area between substrate and adhesive, creating a mechanical interlocking that maximizes adhesion. To enhance the strength and avoid the de-adhesive failure of the joint, it is therefore advisable to increase the contact substrate-adhesive by a mechanical treatment of sanding, grinding or preferably sandblasting, usually considered one of the most effective methods to control the desired level of surface roughness and joint strength. This process, apparently easy to manage, is controlled by a great number of operating parameters, which all contribute to creating a good result. With the aim of evaluating the influence that some of these parameters have on the mechanical characteristics of adhesive-bonded joints, an experimental campaign was carried out. In particular, a steel substrate, an epoxy adhesive and various types of sand, different in nature and granulometry were used. The variable parameters for the execution of blasting are sand, impact angle and pressure. The assessments departed from an investigation into their effect on surface roughness and thereafter the mechanical properties of the bonded joints were analyzed.

Effect of natural fibers reinforcement on lap-shear strength of adhesive bonded joints

2020 ◽  
Vol 23 ◽  
pp. 541-544
Author(s):  
Pavani Udatha ◽  
Y Naidu Babu ◽  
M Satyadev ◽  
Lakshmana Rao Bhagavathi
Keyword(s):  
Shear Strength ◽  
Natural Fibers ◽  
Bonded Joints ◽  
Lap Shear Strength ◽  
Lap Shear ◽  
Adhesive Bonded Joints

scholarly journals Effect of Carbon Black Nanofiller on Adhesion Properties of SBS Rubber Surfaces Treated by Low-Pressure Plasma

Polymers ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 616
Author(s):  
Jacek Tyczkowski ◽  
Jacek Balcerzak ◽  
Jan Sielski ◽  
Iwona Krawczyk-Kłys
Keyword(s):  
Carbon Black ◽  
Plasma Treatment ◽  
Photoelectron Spectroscopy ◽  
Peel Test ◽  
Low Pressure ◽  
Peel Strength ◽  
Bonded Joints ◽  
Adhesion Properties ◽  
Before And After ◽  
Adhesive Bonded Joints

Studies on the surface modification of commercial styrene-butadiene-styrene (SBS) rubber with different carbon black (CB) nanofiller content (10–80 parts per hundred parts of rubber (phr)) performed by low-pressure oxygen plasma are presented in this paper. The adhesion properties of the rubber were determined by the peel test for adhesive-bonded joints prepared with a water-based polyurethane (PU) adhesive. The chemical structure and morphology of the SBS rubber surface before and after plasma treatment were investigated by X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM), respectively. The peel tests showed that the plasma treatment significantly improved the strength of adhesive-bonded joints in the entire range of CB tested, revealing a clear maximum for approximately 50 phr of CB. It was also found that as a result of plasma treatment, functional groups that are responsible for the reactions with the PU adhesive, such as C−OH and C=O, were formed, and their concentration, similar to the peel strength, showed maximum values for approximately 50 phr CB. The occurrence of these maxima was explained using the bound rubber model.

Effect of adherend deflection on lap-shear tensile strength of laser-treated adhesive-bonded joints

2020 ◽  
Vol 97 ◽  
pp. 102481
Author(s):  
Hailang Wan ◽  
Junying Min ◽  
Jun Zhang ◽  
Jianping Lin ◽  
Chengcheng Sun
Keyword(s):  
Tensile Strength ◽  
Bonded Joints ◽  
Lap Shear ◽  
Adhesive Bonded Joints

Influence of surface roughness, friction coefficient, and wrap angle on clinching joint strength and its correlation with belt friction phenomenon

2021 ◽  
pp. 135065012110253
Author(s):  
Santosh Kumar ◽  
Vimal Edachery ◽  
Swamybabu Velpula ◽  
Avinash Govindaraju ◽  
Sounak K. Choudhury ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Friction Coefficient ◽  
Joint Strength ◽  
Joint Interface ◽  
Cross Sectional ◽  
Lap Shear ◽  
Mathematical Correlation ◽  
Mechanical Clinching ◽  
Wrap Angle

Clinching is an economical sheet joining technique that does not require any consumables. Besides, after its usage, the joints can be recycled without much difficulty, making clinching one of the most sustainable and eco-friendly manufacturing processes and a topic of high research potential. In this work, the influence of surface roughness on the load-bearing capacity (strength) of joints made by the mechanical clinching method in cross-tensile and lap-shear configuration is explored. Additionally, a correlating mathematical model is established between the joint strength and its surface parameters, namely, friction coefficient and wrap angle, based on the belt friction phenomenon. This correlation also explains the generally observed higher strength in lap-shear configuration compared to cross-tensile in clinching joints. From the mathematical correlation, through friction by increasing the average surface roughness, it is possible to increase the strength of the joint. The quality of the thus produced joint is analyzed by cross-sectional examination and comparison with simulation results. Experimentally, it is shown that an increment of >50% in the joint strength is achieved in lap-shear configuration by modifying the surface roughness and increasing the friction coefficient at the joint interface. Further, the same surface modification does not significantly affect the strength in cross-tensile configuration.

Submicron surface roughening of aliphatic polyamide 6,6 fabric through low temperature plasma and its effect on interfacial bonding in rubber composite

2017 ◽  
Vol 47 (8) ◽  
pp. 2029-2049 ◽  
Author(s):  
Siddhan Periyasamy ◽  
Krishna Prasad G ◽  
Raja ASM ◽  
Prashant G Patil
Keyword(s):  
Surface Roughness ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Plasma Treatment ◽  
Treatment Time ◽  
Surface Roughening ◽  
Temperature Plasma ◽  
Nylon 6,6 ◽  
Rubber Composite ◽  
Scanning Electron

The present study aims to produce submicron surface roughening of aliphatic polyamide 6,6 (nylon 6,6) fabric using dielectric barrier discharge-based atmospheric low temperature plasma for improving the adhesion bonding with rubber. The plasma treatment was done in the time ranging from 15 s to 300 s. Formation of surface roughness on the fabric due to plasma treatment and the associated chemical changes were studied through high-resolution scanning electron microscope, geometrical surface roughness by Kawabata evaluation system surface tester, contact angle measurements and Fourier transform infrared in Attenuated total reflectance mode. Scanning electron microscope micrographs revealed the presence of submicron roughness on the nylon 6,6 fibre surface with pores of around 100 nm (0.1 µm) for the optimum treatment time of 180 s above which the pore merging effect dominated resulting in the net low surface roughness. Geometrical roughness (SMD) results were also well in agreement with the scanning electron microscope results for the roughening and the optimum effect of the plasma treatment. The control and plasma treated nylon 6,6 samples were used as reinforcements for rubber composite. The peel strength of the rubber composite, which is a measure of interfacial bonding, increased to 150% as the maximum for the optimum plasma treatment time of 180 s. Intense rubber deposits over the 180 s plasma treated samples were observed while only a few deposits of rubber were observed on the control fabric when their interfaces were examined through scanning electron microscope after peeling test.

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