Study of High-Density Polyethylene (HDPE) Kinetics Modification Treated by Dielectric Barrier Discharge (DBD) Plasma

Neto, João Freire de Medeiros; Souza, Ivan Alves de; Feitor, Michelle Cequeira; Targino, Talita Galvão; Diniz, Gutembergy; Libório, Maxwell Santana; Sousa, Rômulo Ríbeiro Magalhães de; Costa, Thércio Henrique de Carvalho

doi:10.3390/polym12102422

Cited by 7 publications

(2 citation statements)

References 74 publications

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“…The plasma reactor configuration used two gas entrance, and in this work a DC plasma discharge was used, as illustrated by the schematic in Figure 1 [40][41][42]. The mixture from the flask, carrier gas plus vapor from the gas plasma, entered the reactor chamber in a controlled manner through a fine adjustment valve, two valves for pressure control, and adjustment of gas concentration in the reactor were used, as shown in Figure 1.…”

Section: Surface Modificationmentioning

confidence: 99%

Investigation of the Drag-Reduction Phenomenon on Plasma-Modified Surface

et al. 2022

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Drag is one of the main energy-dissipating phenomena in engineering applications. Drag-reduction mechanisms have been studied to reduce this cost. Superhydrophobic surfaces (SHS) have high water repellency and have been studied as an alternative mechanism for reducing drag. The high level of repellency is due to the hierarchical structures in the micro- and nano-scales, making these surfaces able to trap air layers that impose the condition of slipping. The present work investigated the phenomenon of drag reduction on surfaces made of Sylgard® 184 elastomer and modified by low-pressure plasma treatments. Atmospheres with 40% Argon and 60% Acetylene, and 20% Argon and 80% Acetylene were used, varying the treatment times from 10 to 15 min of exposure to Acetylene. The surface, morphological and chemical modifications were confirmed by XPS and AFM analyses, showing the impression of a rough structure on the nanometric scale with deposition of chemical elements from the gas plasma. Furthermore, the obtained SHS showed lower resistance to flow, tested by the imposition of flow in channels.

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Section: Surface Modificationmentioning

confidence: 99%

Investigation of the Drag-Reduction Phenomenon on Plasma-Modified Surface

et al. 2022

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“…The APP is frequently used to increase the SFE of PE, to allow printing, varnishing, coating, or gluing on its surface. Examples of studies focussing on this subject include the application of dielectric barrier discharge (DBD) for the treatment of high-density polyethylene (HDPE) [ 9 ] or ultrahigh-modulus polyethylene (UHMPE) fibers [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

Visualization of Activated Area on Polymers for Evaluation of Atmospheric Pressure Plasma Jets

Korzec¹,

Andres²,

Brandes³

et al. 2021

Polymers

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The treatment of a polymer surface using an atmospheric pressure plasma jet (APPJ) causes a local increase of the surface free energy (SFE). The plasma-treated zone can be visualized with the use of a test ink and quantitatively evaluated. However, the inked area is shrinking with time. The shrinkage characteristics are collected using activation image recording (AIR). The recording is conducted by a digital camera. The physical mechanisms of activation area shrinkage are discussed. The error sources are analyzed and methods of error reduction are proposed. The standard deviation of the activation area is less than 3%. Three polymers, acrylonitrile butadiene styrene (ABS), high-density polyethylene (HDPE), and polyoxymethylene (POM), are examined as a test substrate material. Due to a wide variation range of SFE and a small hydrophobic recovery, HDPE is chosen. Since the chemical mixtures tend to temporal changes of the stoichiometry, the pure formamide test ink with 58 mN/m is selected. The method is tested for the characterization of five different types of discharge: (i) pulsed arc APPJ with the power of about 700 W; (ii) piezoelectric direct discharge APPJ; (iii) piezoelectric driven needle corona in ambient air; (iv) piezoelectric driven plasma needle in argon; and (v) piezoelectric driven dielectric barrier discharge (DBD). For piezoelectrically driven discharges, the power was either 4.5 W or 8 W. It is shown how the AIR method can be used to solve different engineering problems.

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A medium-scale volume dielectric barrier discharge system for short-term treatment of cereal seeds indicates improved germination performance with long-term effects

Brust

Nishime

Wannicke

et al. 2021

Journal of Applied Physics

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Atmospheric pressure plasma has the potential of being applied in pre-harvest processes as a sustainable technology for seed and plant treatment. In this study, a medium-scale volume dielectric barrier discharge reactor with a power density of 53.5 mW/cm3 was developed and applied for continuous treatment of larger amount of seeds. Within the argon plasma, reactive oxygen and nitrogen species were observed by optical emission spectroscopy. Short-term plasma treatment in the range of seconds of wheat and barley seeds revealed improved germination performance accompanied by altered seed surface properties. Depending on the exposure time, plasma displayed a positive impact on maximum germination and germination speed in both species. In line with this, the t50 values were significantly decreased for plasma treated seeds compared to untreated seeds for wheat and barley. Cumulative germination was enhanced from 20% up to 53% after 27 h of germination for wheat seeds treated from 10 s to 60 s with plasma. Barley seeds respond to the short plasma treatment times with increased germination of 10%–23% after 24 h observation time. Moreover, the seed surface of both plant species became more hydrophilic after plasma treatment supported by a decrease in the water contact angle and an increase in hydrophilic functional groups being detected by x-ray photoelectron spectroscopy. Water uptake by seeds was moderately increased after 2 h of imbibition for both plant species. The positive effects of plasma treatment on germination performance were still detectable after storage of seeds for one and two months.

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Study of High-Density Polyethylene (HDPE) Kinetics Modification Treated by Dielectric Barrier Discharge (DBD) Plasma

Cited by 7 publications

References 74 publications

Investigation of the Drag-Reduction Phenomenon on Plasma-Modified Surface

Investigation of the Drag-Reduction Phenomenon on Plasma-Modified Surface

Visualization of Activated Area on Polymers for Evaluation of Atmospheric Pressure Plasma Jets

A medium-scale volume dielectric barrier discharge system for short-term treatment of cereal seeds indicates improved germination performance with long-term effects

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