Effects of acid treatment at different temperatures on the surface dielectric properties of low‐density polyethylene

Simonovic, K.; Petronijević, Ivan; Kostoski, D.; Dojčilović, Jablan; Luyt, A. S.; Dudić, Duško

doi:10.1002/pi.4731

Cited by 5 publications

(4 citation statements)

References 25 publications

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“…Additionally, there is no requirement to modify the polymer surface in order to improve adhesion properties that promote the impregnation of compounds [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Effect of supercritical CO2 and olive leaf extract on the structural, thermal and mechanical properties of an impregnated food packaging film

Cejudo-Bastante

Cran

Casas

et al. 2019

The Journal of Supercritical Fluids

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Poly(ethylene terephthalate)/polypropylene (PET/PP) films containing olive leaf extract (OLE) were obtained by supercritical solvent impregnation (SSI) in batch (BM) and semi-continuous (SM) modes.The study focused on the impact of pressure, temperature, CO2 flow and OLE on the properties of the impregnated films. Thermal analysis of non-impregnated samples revealed a decrease in the crystallinity of PP layer treated at 35 ºC and an increase in the Tg of PET treated at 55 ºC due to CO2 sorption. In impregnated samples, high pressures caused a decrease in the crystallinity of PP layer, whereas PET layer remained unaffected. Higher pressures favour impregnation in BM, whereas different trends were found for SM impregnations. Although the film properties were not compromised after impregnation, the CO2 stream used in SM slightly weakened the impregnated films. Overall, conditions of 400 bar and 35ºC in BM were favorable for producing highly antioxidant films with minor structural modifications.

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“…Additionally, there is no requirement to modify the polymer surface in order to improve adhesion properties that promote the impregnation of compounds [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Effect of supercritical CO2 and olive leaf extract on the structural, thermal and mechanical properties of an impregnated food packaging film

Cejudo-Bastante

Cran

Casas

et al. 2019

The Journal of Supercritical Fluids

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“…Accordingly, it may be possible to use PE thin film in micro and nano-size energy storage systems. [13], polar alüminyum trihidrat moleküllerinin düşük yoğunluklu polietilenin dielektrik özelliklerine etkisinin incelendiği [14], ışımaya maruz kalmış yüksek yoğunluklu polietilendeki moleküler rölaksasyonlara etkisinin incelendiği [15], kablolarda yalıtıcı olarak kullanılan çapraz bağlı polietilendeki dipolar rölaksasyonların incelendiği [16], düşük yoğunluklu polietilende α-rölaksasyonuna nemin etkilerinin incelendiği [17], yapay morötesi ışımaya maruz bırakılmış düşük yoğunluklu polietilenin dielektrik özelliklerinin incelendiği [18], karbon katkılı polietilen kompozitlerin dielektrik özelliklerinin incelendiği [19], yüksek elektrik alan etkisi altındaki düşük youğunluklu polietilenin dielektrik kayıp faktörünün incelendiği [20], düşük yoğunluklu polietilennin dielektrik özelliklerine asit uygulamalarının etkilerinin incelendiği [21], boron nitrat katkılı polietilen nanokompozitlerin güçlendirilmiş dielektrik özelliklerinin incelendiği [22], nanosilika katkılı düşük yoğunluklu polietilen kompozitlerin dielektrik özelliklerinin incelendiği [23], reaktif plazma polimerizasyon ile üretilmiş azot içeren plazma polietilenin dielektrik ve optik özelliklerinin incelendiği [24], grafit katkılı çok tabakalı polietilen kompozitlerin mekanik, dielektrik ve kristal özelliklerinin incelendiği [25], polipirol katkılı polietilenin DC iletkenlik özelliklerinin incelendiği [26] çalışmalar literatürden bilinmektedir. Bu çalışmalardan, ZnO partiküllerinin eklenmesi ile üretilmiş külçe boyutlarındaki polietilen nanokompozitlerin dielektrik özelliklerinin incelendiği [1], Si/SiO 2 katkılanmış külçe boyutlarında polietilen kompozitlerin dielektriksel, yapısal ve termal özelliklerinin incelendiği [3] ve Fe3O4 katkılanmış yüksek yoğunluklu polietilen nanokompozitlerin termal ve dielektrik özeliklerinin incelendiği [5] çalışmalarda külçe halindeki PE'nin yaklaşık 10 5 Hz de sahip olduğu dielektrik sabitin yaklaşık 2 olarak elde edilmiştir.…”

Section: ö N E ç I K a N L A R unclassified

Polietilen ince filmin dielektrik özelliklerinin frekans, sıcaklığa bağlı davranışı ve camsı geçiş sıcaklığının tespiti

Yakut

2021

Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi

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 Determination of glass transition temperature by VFT model  Higher dielectric constant of PE thin film compared to dielectric constant of bulk PE  Determining glass transition temperature of PE thin film at higher temperatures than glass transition temperature of bulk PE Figure A. The dependence of the frequency value at which the maximum dielectric loss is observed from the dielectric loss obtained from the dielectric loss graph for 35000 g/mol and 750 nm thick polyethylene (PE) thin film (red dots and VFT fit curve) and the temperature dependence of the frequency values at which the maximum electric modulus is observed from the electric modulus graph (blue dots and activation curve) Purpose:The aim of this article is to analyze dielectric properties and glass transition temperature of PE thin film in comparison to bulk PE in order to evaluate the possible application opportunities of PE thin film in enery storage systems. Theory and Methods: PE thin film samples were deposited by thermal evaporation method between Al thin film electrodes under 10-5 Torr vacuum conditions. The dielectric spectroscopy measurements were operated by high frequency empedance analyzer. Results: The results show that thermal evaporation process causes breakage of PE main chain and occurance of oligomers and radicals. These oligomers and radicals may be the reason of increasing dielectric constant as a result of space-charge polarization. Also, the oligomers and radicals may react with each other and the main chain and cause the construction of cross-linked network. The presence of this network is the reason of increasing glass transition temperature. Conclusion: The results obtained for the change of dielectric constant and glass transition temperature show that PE thin films can be thought as candidate for organic energy storage systems.

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“…Thermooxidative ageing usually causes degradation of mechanical properties but in some cases, such as reticulated resins, can lead to an improvement in these properties due to the subsequent process of networking [24]. The changes in electrical characteristics caused by these processes are very complex and diverse [6][7][8][9]. In the existing literature there is no evidence that the accelerated ageing that we applied to the LDPE + graphite composite (up to 4 days at room temperature ageing at high oxygen pressure) caused noticeable chemical or physical changes.…”

Section: 2mentioning

confidence: 99%

“…The most common causes of changes in the properties of polymeric materials are: application of mechanical stress [1]; elevated temperature [2,3]; exposure to electromagnetic radiation of high energy [4,5]; presence of slowly varying electric fields [6]; contact with aggressive chemicals [7]. The changes in polymeric materials resulting from aforementioned factors can be classified into two groups.…”

Section: Introductionmentioning

confidence: 99%

The detection of the early stages of ageing in an LDPE+graphite composite by comparison of dielectric responses induced by sinusoidal and triangular signals

Petronijević¹,

Simonovic²,

Marinković³

et al. 2014

Express Polym. Lett.

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Abstract. This study describes the possibility of dielectric characterization of the initial stages of ageing in an low-density polyethylene (LDPE) + graphite composite, which is not possible using the standard method of dielectric spectroscopy. It is shown that the differences between the delay angles, #$ = $ TRI -%$ SIN , obtained using triangular and sinusoidal excitations on the composite samples, shows a maximum, and at the same time the position of this maximum shows more sensitivity to changes in the electrical properties of the material caused by ageing than other dielectric parameters. In order to clarify the applied methodology, a comparative analysis of the dielectric properties of other polymers poly(vinyl chloride) (PVC) and poly(vinyl alcohol) (PVA) and a conductive polymer composite (LDPE + carbon black) with respect to the application of sinusoidal and triangular electrical signals was carried out. Based on the presented results, we believe that the position of the peak in the frequency spectra of the difference between the delay angles obtained by using triangular and sinusoidal signals may be a suitable parameter for the dielectric characterization of polymeric materials.

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Effects of acid treatment at different temperatures on the surface dielectric properties of low‐density polyethylene

Abstract: The results presented indicate that a suitable choice of acid treatment of low‐density polyethylene can effect surface polarization while preserving low values of surface AC conductivity of the polymer.

Cited by 5 publications

References 25 publications

Effect of supercritical CO2 and olive leaf extract on the structural, thermal and mechanical properties of an impregnated food packaging film

Effect of supercritical CO2 and olive leaf extract on the structural, thermal and mechanical properties of an impregnated food packaging film

Polietilen ince filmin dielektrik özelliklerinin frekans, sıcaklığa bağlı davranışı ve camsı geçiş sıcaklığının tespiti

The detection of the early stages of ageing in an LDPE+graphite composite by comparison of dielectric responses induced by sinusoidal and triangular signals

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