Effect of Beta Radiation on the Quality of the Bonded Joint for Difficult to Bond Polyolefins

Bednarik, Martin; Mizera, Aleš; Maňas, David; Ovsík, Martin; Stoklásek, Pavel

doi:10.3390/polym11111863

Cited by 8 publications

(19 citation statements)

References 45 publications

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“…Due to this process, the wetting of the surface declined. This phenomenon was described and carefully observed in previous research [ 8 ] that was published in 2019. In this article, the dependence of gel content on absorbed dose of radiation in PP was observed.…”

Section: Resultssupporting

confidence: 65%

“…The height of the drop (h) and the radius at the point of impingement (r b ) were used to calculate the wetting contact angle (θ) through the following set of equations [ 8 , 37 ]:

and:

…”

Section: Methodsmentioning

confidence: 99%

“…In comparison with mechanical bonding, such as welding and riveting, the usage of adhesive does not lead to the creation of stress and surface degradation within the unit [ 3 ]. Adhesive bonding, especially when used with polyolefins, also provides the following benefits [ 5 , 6 , 7 , 8 , 9 , 10 , 11 ]: Less stress on the interface of the bond, as the load is evenly distributed within a greater area, which leads to better integrity of the conjoined pieces. Vibration dampening, which increases rigidity and resistance to buckling.…”

Section: Introductionmentioning

confidence: 99%

“…Surface treatment of the polyolefins, as well as the improvement of their adhesion properties, can be performed by numerous methods, e.g., corona discharge, flame/plasma treatment, or chemical etching [ 8 , 9 , 11 ]. Encinas et al [ 13 ] have shown the positive effect of atmospheric-pressure plasma on the adhesion properties of high-density polyethylene (HDPE), low-density polyethylene (LDPE), and polypropylene (PP).…”

Section: Introductionmentioning

confidence: 99%

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Influence of the β− Radiation/Cold Atmospheric-Pressure Plasma Surface Modification on the Adhesive Bonding of Polyolefins

et al. 2020

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The goal of this research was to examine the effect of two surface modification methods, i.e., radiation cross-linking and plasma treatment, on the adhesive properties and the final quality of adhesive bonds of polypropylene (PP), which was chosen as the representative of the polyolefin group. Polymer cross-linking was induced by beta (accelerated electrons—β−) radiation in the following dosages: 33, 66, and 99 kGy. In order to determine the usability of β− radiation for these applications (improving the adhesive properties and adhesiveness of surface layers), the obtained results were compared with values measured on surfaces treated by cold atmospheric-pressure plasma with outputs 2.4, 4, and 8 W. The effects of both methods were compared by several parameters, namely wetting contact angles, free surface energy, and overall strength of adhesive bonds. Furthermore, Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM) were conducted. According to our findings the following conclusion was reached; both tested surface modification methods significantly altered the properties of the specimen’s surface layer, which led to improved wetting, free surface energy, and bond adhesion. Following the β− radiation, the free surface energy of PP rose by 80%, while the strength of the bond grew in some cases by 290% in comparison with the non-treated surface. These results show that when compared with cold plasma treatment the beta radiation appears to be an effective tool capable of improving the adhesive properties and adhesiveness of PP surface layers.

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Section: Resultssupporting

confidence: 65%

“…The height of the drop (h) and the radius at the point of impingement (r b ) were used to calculate the wetting contact angle (θ) through the following set of equations [ 8 , 37 ]:

and:

…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Influence of the β− Radiation/Cold Atmospheric-Pressure Plasma Surface Modification on the Adhesive Bonding of Polyolefins

et al. 2020

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“…The relative number of oxygen-containing groups increased in Figure 13. Infrared spectra of irradiated HDPE [29].…”

Section: Gel Contentmentioning

confidence: 99%

Nano-Mechanical Properties of Surface Layers of Polyethylene Modified by Irradiation

et al. 2020

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This study’s goal was to describe the influence of a wide range of ionizing beta radiation upon the changes in surface layer mechanical properties and structural modifications of selected types of polymer. Radiation crosslinking is a process whereby the impingement of high-energy electrons adjusts test sample structures, thus enhancing the useful properties of the material, e.g., hardness, wear-resistance, and creep, in order that they may function properly during their technical use. The selected polymers tested were polyolefin polymers like polyethylene (Low-density polyethylene LDPE, High-density polyethylene HDPE). These samples underwent exposure to electron radiation of differing dosages (33, 66, 99, 132, 165, and 198 kGy). After the crosslinking process, the samples underwent testing of the nano-mechanical properties of their surface layers. This was done by means of a state-of-the-art indentation technique, i.e., depth-sensing indentation (DSI), which detects the immediate change in the indentation depth associated with the applied force. Indeed, the results indicated that the optimal radiation dosage increased the mechanical properties by up to 57%; however, the beneficial levels of radiation varied with each material. Furthermore, these modifications faced examination from the structural perspective. For this purpose, a gel test, Raman spectroscopy, and crystalline portion determination by X-ray all confirmed the assumed trends.

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Optimized Magnetically Docked Ingestible Capsules for Non‐Invasive Refilling of Implantable Devices

Al‐Haddad,

Guarnera,

Tamadon

et al. 2024

Advanced Intelligent Systems

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Automated drug delivery systems (ADDS) improve chronic disease management by enhancing adherence and reducing patient burden, particularly in conditions like type 1 diabetes, through intraperitoneal insulin delivery. However, periodic invasive refilling of the reservoir is needed in such a class of implantable devices. In previous work, an implantable ADDS with a capsule docking system is introduced for non‐invasive reservoir refilling. Yet, it encounters reliability issues in manufacturing, sealing, and docking design and lacks evidence on intestinal tissue compression effects and chronic in vivo data. This work proposes an optimization of the different components featuring this ADDS. The ingestible capsule is designed, developed, and tested following ISO 13485, exhibiting high insulin stability and optimal sealing for six days in harsh gastrointestinal‐like conditions. A magnetic docking system is optimized, ensuring reliable and stable capsule docking at a clinically relevant distance of 5.92 mm. Histological tests on human intestinal tissues confirm safe capsule compression during docking. Bench tests demonstrate that the integrated mechatronic system effectively docks capsules at various peristalsis‐mimicking velocities. A six‐week in vivo test on porcine models demonstrates chronic safety and provides hints on fibrotic reactions. These results pave the way for the further evolution of implantable ADDS.

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Effect of Beta Radiation on the Quality of the Bonded Joint for Difficult to Bond Polyolefins

Cited by 8 publications

References 45 publications

Influence of the β− Radiation/Cold Atmospheric-Pressure Plasma Surface Modification on the Adhesive Bonding of Polyolefins

Influence of the β− Radiation/Cold Atmospheric-Pressure Plasma Surface Modification on the Adhesive Bonding of Polyolefins

Nano-Mechanical Properties of Surface Layers of Polyethylene Modified by Irradiation

Optimized Magnetically Docked Ingestible Capsules for Non‐Invasive Refilling of Implantable Devices

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