Study of structural changes in thermoplastics using dynamic mechanical analysis

Kohutiar, Marcel; Janík, R.; Pajtášová, Mariana; Ondrušová, Darina; Labaj, Ivan; Mezencevová, Viktória

doi:10.1088/1757-899x/776/1/012092

Cited by 7 publications

(3 citation statements)

References 6 publications

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“…In plasma unmodified PVC polymer films, the glass transition temperatures increase in order from the E (54.5 • C), through the Loss modulus (E ) (64.4 • C) to the temperatures for Tan δ (72.5 • C). Such a sequence of increasing the glass transition temperatures across the modules of dynamic mechanical analysis is thus, in accordance with the literature [70][71][72][73][74] and the same order was recorded even after DCSBD plasma modification, specifically 56.1 • C, 63.9 • C and 72.9 • C, respectively (Table 4). The average change in the glass transition temperature for the plasma modified PVC polymer film was an increase of 1.6 • C for the E , a decrease of 0.5 • C for the E and an increase of 0.5 • C for the Tan δ glass transition temperature (Figure 19).…”

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confidence: 90%

DMA Analysis of Plasma Modified PVC Films and the Nature of Initiated Surface Changes

et al. 2022

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The application of DCSBD (Diffuse Coplanar Surface Barrier Discharge) plasma is referred to as the surface modification/activation of materials. The exposure of material surfaces to DCSBD plasma is initiated by changes in their chemical composition, surface wettability and roughness. The given study presents the mentioned plasma application in the context of the modification of the material viscoelastic properties, namely the PVC polymer film. The measurement of viscoelastic properties changes of PVC was primarily examined by a sensitive thermal method of dynamic-mechanical analysis. This analysis allows identifying changes in the glass transition temperature of PVC, before and after DCSBD plasma application, Tangens Delta, supported by glass transition temperatures of Elastic and Loss modulus. The results of the present study prove that DCSBD plasma applied on both sides to PVC surfaces causes changes in its viscoelastic properties. In addition, these changes are presented depending on the variability of the material position, with respect to the winding of the electrodes in the ceramic dielectric generating the DCSBD plasma during modification. The variability of the PVC position holds an important role, as it determines the proportion of filamentous and diffuse components of the plasma that will interact with the material surface during modification. The application of DCSBD plasma must, therefore, be considered a complex modification of the material, and as a result, non-surface changes must also be considered.

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confidence: 90%

DMA Analysis of Plasma Modified PVC Films and the Nature of Initiated Surface Changes

et al. 2022

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“…In addition to these mentioned studies, there were also other studies mainly dealing with polymer materials, which the authors of this article are trying to follow up on. In addition, in the presented work, plasma generation on the surface of a ceramic dielectric is observed and described using the Schlieren effect method and image analysis and a thermal camera for a better understanding of the surface modification process of polyvinyl chloride, polypropylene and polyethylene terephthalate polymer films [21][22][23][24][25][26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Modification process of selected thermoplastics with cold plasma and evaluation of changes in their properties

Janík¹,

Kohutiar

Skalková³

et al. 2023

Materialwissenschaft Werkst

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Targeted surface modification of materials is becoming a commonly used process in the production and research environment. This process alters the functional properties of the polymer surface and, under laboratory and manufacturing conditions, can ideally be initiated by a diffuse coplanar surface barrier discharge plasma, also called a cold plasma. The efficiency of the surface modification process by this type of discharge is given mainly by the speed of the plasma‐chemical modification process. An interesting area of research in this area is the characterization of changes in the above plasma chemical modification. The nature of the changes can be observed ideally on the flat surfaces of selected materials, since the height of the visually homogeneous plasma layer is approximately 0.3 mm. During the process of plasma chemical modification, the investigated surface of the polymeric material is also exposed to temperature, electric micro‐discharges, heat flow and ultraviolet radiation. All these elements affect changes that need to be investigated and described. The effect of temperature and micro‐discharges during the cold plasma treatment can be evaluated from thermograms. Visually homogenous plasma respectively heat flow from its generation is first time monitored with Schlieren Imaging system. The effect of degradation (due to ultraviolet radiation) of polymers is monitored with static tensile test.

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“…Moreover, our recent study considering the surface changes of PA 6 after DCSBD plasma treatment demonstrated the high potential of this technology to be part of industrial systems due to its very fast surface activation (0.25 s) and long-term preservation of the achieved properties [ 7 ]. The largest group of produced polymers worldwide represented by polyolefins were subjected to DCSBD plasma treatment in several studies [ 15 , 16 , 17 ]. However, the used exposure times were often too long (30–60 s) to meet industrial demand.…”

Section: Introductionmentioning

confidence: 99%

Changes in Surface Characteristics of BOPP Foil after Treatment by Ambient Air Plasma Generated by Coplanar and Volume Dielectric Barrier Discharge

et al. 2021

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Biaxially oriented polypropylene (BOPP) is a highly transparent polymer defined by excellent mechanical and barrier properties applicable in the food packaging industry. However, its low surface free energy restricts its use in many industrial processes and needs to be improved. The presented study modifies a BOPP surface using two different atmospheric-pressure plasma sources operating in ambient air and capable of inline processing. The volume dielectric barrier discharge (VDBD) and diffuse coplanar surface barrier discharge (DCSBD) were applied to improve the wettability and adhesion of the 1–10 s treated surface. The changes in morphology and surface chemistry were analyzed by SEM, AFM, WCA/SFE, and XPS, and adhesion was evaluated by a peel force test. Comparing both plasma sources revealed their similar effect on surface wettability and incorporation of polar functional groups. Additionally, higher surface roughness in the case of VDBD treatment contributed to slightly more efficient adhesion in comparison to DCSBD. Although we achieved comparable results for both plasma sources in the term of enhanced surface wettability, degree of oxidation, and stability of induced changes, DCSBD had less effect on the surface deterioration than VDBD, where surface structuring caused an undesirable haze.

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Study of structural changes in thermoplastics using dynamic mechanical analysis

Cited by 7 publications

References 6 publications

DMA Analysis of Plasma Modified PVC Films and the Nature of Initiated Surface Changes

DMA Analysis of Plasma Modified PVC Films and the Nature of Initiated Surface Changes

Modification process of selected thermoplastics with cold plasma and evaluation of changes in their properties

Changes in Surface Characteristics of BOPP Foil after Treatment by Ambient Air Plasma Generated by Coplanar and Volume Dielectric Barrier Discharge

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