A detailed dielectric relaxation spectroscopy study of artificial UV weathered low density polyethylene

Ramanujam, Maalolan; Wachtendorf, Volker; Purohit, Purv J.; Mix, Renate; Schönhals, Andreas; Friedrich, Jörg

doi:10.1016/j.tca.2011.12.003

Cited by 11 publications

(7 citation statements)

References 31 publications

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“…Arrhenius tipi davranışın hakim olduğu görülmektedir. Burada f∞ çok yüksek sıcaklıklarda gözlenmesi öngörülen maksimum elektrik modülün gözleneceği frekans ifadesi [12,13], ΔE polarize olan yükün polarizasyonuna neden olabilecek minimum termal enerji olarak bilinen aktivasyon enerjisi [17,18], kB Boltzman sabiti (8,617x10 -5 eV K -1 ) ve T Kelvin cinsinden sıcaklık ifadesidir [35,39]. Arrhenius davranışından elde edilen uzay-yük polarizasyonu için aktivasyon enerjisi 3,09 eV'tur.…”

Section: ∆ ( 5 )unclassified

“…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

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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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Section: ∆ ( 5 )unclassified

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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“…Polyethylene (PE) has been widely used for various applications in view of its good toughness, almost zero moisture absorption, excellent corrosion, and electrical resistance, low coefficient of friction/wear and ease of processing [4,5,[11][12][13][14][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36]. In particular, extensive research has been carried out on PE based materials as it exhibits excellent biocompatibility, controlled electrical properties and good mechanical properties which make it suitable for a wide range of applications.…”

Section: Introductionmentioning

confidence: 99%

“…The applications of PE include pipes, sheets, plastic containers, acetabular cups for hip replacement, insulator for electrical wire and cables, electronic, and energy applications. Numerous researchers reported improvement in mechanical, physical and chemical properties of high-density polyethylene (HDPE) by blending it with other polymers or inorganic materials [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36]. HDPE is an interesting substrate material for microelectronic applications due its low dielectric loss characteristics and flexibility.…”

Section: Introductionmentioning

confidence: 99%

Novel high‐density polyethylene‐niobium pentoxide dielectric materials

et al. 2018

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This study for the first time reports the processing and properties of high‐density polyethylene (HDPE) reinforced with niobium pentoxide (Nb2O5) up to 40 wt%. In this work, Nb2O5 was chosen as reinforcement because of its advantageous properties such as good dielectric properties, high temperature stability and excellent biocompatible properties. Almost fully dense HDPE–Nb2O5 composites were prepared via hot pressing route. Both the hardness and dielectric properties of the HDPE increased significantly with the addition of Nb2O5. The hardness of HDPE increased from ∼37 to 60 MPa (i.e., by 62%) with the addition of 40 wt% Nb2O5. The dielectric constant and dissipation factor (dielectric loss) were found to increase with the increasing Nb2O5 content. We have achieved highest ever reported dielectric constant (ε') of 14.66 for HDPE–40 wt% Nb2O5 and the dielectric constant of HDPE is enhanced by 237% and shows the potential of Nb2O5 in improving the dielectric and hardness properties of HDPE. With increasing frequency there was slight decrease in the dielectric constant of HDPE–Nb2O5 composites, whereas not much change in the dielectric constant of pure HDPE. The dielectric constant (ε') of HDPE is 4.6 at 1 MHz, while the ε' value for the composite with 40 wt% Nb2O5 ceramic filler was found to be 13.2. The dielectric loss for the HDPE composites is higher than the neat polymer, particularly HDPE–40 wt% Nb2O5 composite measured with maximum dielectric loss (0.08) at 100 Hz. Nevertheless, the dielectric loss of HDPE materials significantly decreased with further increasing the frequency to 1 kHz and the dielectric loss even significantly lowered with increasing frequency to 1 MHz. The experimental values of dielectric constant show much better values than the calculated values based on theoretical models. The newly developed HDPE–Nb2O5 composites are showing much better dielectric properties than the reported literature values of HDPE materials. POLYM. COMPOS., 40:749–757, 2019. © 2018 Society of Plastics Engineers

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“…Measurements of the electrical conduction in oxidized low-density polyethylene (LDPE) have shown that oxidation products such as carbonyl groups act as traps [13]. Furthermore, crosslinking and degradation affect the mobility of macromolecules especially in the amorphous phase, causing a shift of the relaxation maxima and a change in activation energy of dielectric relaxation to which the mentioned dipolar and molecular movements contribute [14,15]. The dielectric loss tangent measurements have been used as a very convenient tool for studying the motion of polar groups (carbonyl, peroxy and hydroperoxy) as tracer groups whose motion reflects the motion of the polymer chains [12,15,16].…”

Section: Introductionmentioning

confidence: 99%

Polyethylene crosslinked in different media: structural changes versus dielectric behaviour

et al. 2014

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Changes in the structure and dielectric properties of low-density polyethylene were created by gamma irradiation in air, deionised water and nitrogen. Role of irradiation media on dielectric and charge trapping behaviour was studied through dielectric loss and thermally stimulated discharge current measurements. Changes in magnitude, position and activation energy of all dielectric relaxations (c, b and a) were found to be dependent on crosslinking and oxidative degradation, two competitive processes which can be tuned by radiation dose and media. Largest changes in the position and activation energy were found for the b relaxation due to its cooperative nature.

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A detailed dielectric relaxation spectroscopy study of artificial UV weathered low density polyethylene

Cited by 11 publications

References 31 publications

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

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

Novel high‐density polyethylene‐niobium pentoxide dielectric materials

Polyethylene crosslinked in different media: structural changes versus dielectric behaviour

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