Influence of chemical modification of the surface of low-density polyethylene on its electret properties

Rychkov, A. A.; Trifonov, S. A.; Kuznetsov, Alexey; Соснов, Е. А.; Rychkov, Dmitry; Малыгин, А. А.

doi:10.1134/s1070427207030214

Cited by 14 publications

(6 citation statements)

References 1 publication

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“…This could be related to the fact that a "crossover" phenomenon does not exist in modified LDPE samples. 32,33 It must be noted, that the maximum values of piezoelectric coefficients obtained here, are 2-4 times lower than those reported previously. [27][28][29] The discrepancy can be explained by different measurement techniques and conditions.…”

Section: Samples and Experimental Procedurescontrasting

confidence: 68%

“…Very similar results have previously been obtained by means of atomic force microscopy on LDPE films treated with phosphorus trichloride vapor. 32 Such changes on the surface of a polymer film should also influence the surface energy and especially its polar component which is determined by the interaction of the polar groups in the surface layer. This was indeed observed on our treated LDPE samples.…”

Section: Resultsmentioning

confidence: 99%

“…Similar results have recently been obtained on polyethylene and polytetrafluoroethylene after various chemical modifications. 32,33,36 Thus, chemical treatment can obviously enhance the thermal stability of electrets from these materials. In ferroelectrets, such treatments should improve the thermal stability of the piezoelectricity.…”

Section: Samples and Experimental Proceduresmentioning

confidence: 99%

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Treatment with orthophosphoric acid enhances the thermal stability of the piezoelectricity in low-density polyethylene ferroelectrets

Rychkov

Altafim

Qiu

et al. 2012

Journal of Applied Physics

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Ferroelectrets have been fabricated from low-density polyethylene (LDPE) films by means of a template-based lamination. The temperature dependence of the piezoelectric d33 coefficient has been investigated. It was found that low-density polyethylene ferroelectrets have rather low thermal stability with the piezoelectric coefficient decaying almost to zero already at 100 °C. This behavior is attributed to the poor electret properties of the polyethylene films used for the fabrication of the ferroelectrets. In order to improve the charge trapping and the thermal stability of electret charge and piezoelectricity, LDPE ferroelectrets were treated with orthophosphoric acid. The treatment resulted in considerable improvements of the charge stability in LDPE films and in ferroelectret systems made from them. For example, the charge and piezoelectric-coefficient decay curves shifted to higher temperatures by 60 K and 40 K, respectively. It is shown that the decay of the piezoelectric coefficient in LDPE ferroelectrets is governed by the relaxation of less stable positive charges. The treatment also leads to noticeable changes in the chemical composition of the LDPE surface. Infrared spectroscopy reveals absorption bands attributed to phosphorus-containing structures, while scanning electron microscopy shows new island-like structures, 50–200 nm in diameter, on the modified surface.

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Section: Samples and Experimental Procedurescontrasting

confidence: 68%

Section: Resultsmentioning

confidence: 99%

Section: Samples and Experimental Proceduresmentioning

confidence: 99%

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Treatment with orthophosphoric acid enhances the thermal stability of the piezoelectricity in low-density polyethylene ferroelectrets

Rychkov

Altafim

Qiu

et al. 2012

Journal of Applied Physics

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“…This would result in formation of “island-like” structures of APTES on the silica. While the presence of these APTES islands can further contribute to the induction of deep traps, they can act as individual nuclei, inducing interfacial crystallization. , The broadening that is observed in the NC_5 and NC_7 crystallization curves can also be explained as nucleation and transcrystallization at the silica/polymer interface emerging from the island-like nuclei. While this phenomenon contributes to increasing filler–polymer interactions, the resulting interfacial areas further decrease the space charge injection due to their exposure to the amine functionality.…”

Section: Results and Discussionmentioning

confidence: 99%

On the Silica Surface Modification and Its Effect on Charge Trapping and Transport in PP-Based Dielectric Nanocomposites

Mahtabani

Rytöluoto

Anyszka

et al. 2020

ACS Appl. Polym. Mater.

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The effect of filler surface functionalization with 3-aminopropyltriethoxysilane (APTES) on the charge trapping and transport was studied in polypropylene (PP)/(ethylene-octene) copolymer (EOC)/silica nanodielectrics. Different reaction conditions were utilized for silica functionalization to alter the deposited layer morphology. This approach made it possible to engineer the filler−polymer interface to achieve optimized dielectric properties for the nanocomposites. The successful chemical modification of the silica surface was confirmed via thermogravimetric analysis (TGA), Fourier-transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS). Subsequently, the effect of the engineered filler−polymer interface on the nanocomposites' crystallinity was analyzed with differential scanning calorimetry (DSC). Scanning electron microscopy (SEM) was utilized to observe the morphology of the nanocomposite as well as the silica dispersion. Finally, the effect of the silica functionalization on the dielectric properties of PP/EOC/silica nanocomposites was tested via thermally stimulated depolarization current (TSDC) and broadband dielectric spectroscopy (BDS). The results suggested that the presence of the amine functionality on the silica reduces interfacial losses in nanocomposites, and hinders further injection of space charge by introducing deep trap states at the filler−polymer interface. Under certain conditions, APTES can form an "island-like" morphology on the silica surface. These islands can facilitate nucleation, inducing transcrystallization at the filler−polymer interface. The island-like structures present on the silica would further contribute to the induction of deep traps at the filler−polymer interface resulting in the reduction of space charge injection.

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“…the optimal amount can be associated with the antistatic feature of the latter. This is also indicated by the fact that in the nature of the static electrification of polymeric materials and the mechanism of their charging in the field of the negative corona, it is basically the same and includes the injection of charge carriers on the surface layer of the polymer [8]. In polymers, various types of molecular relaxation processes are possible.…”

Section: Resultsmentioning

confidence: 99%

Influence of organic additives on electret state of high pressure polyethylene

Gojayev¹,

Osmanova²,

Zeynalov³

et al. 2020

Global J. Eng. Tech. Adv.

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The paper presents the results of a study of the electret properties of high-pressure polyethylene (hppe) modified with organic additives as phthalic-anhydride (pha) and orthophenylenediamine (ophd). Samples obtained and processed by extrusion on an industrial unit brand LRP-700m. Additives were introduced into HPPE by mechanical mixing. For polarization, the samples were placed on a grounded electrode and charged with a negative corona at a voltage of 7 kv. After polarization, the total surface charge of the samples was determined by the compensation method. The thermally stimulated current was recorded in the temperature range 290–520 K, provided that the heating increased linearly at a rate of 3.5 k / min. It is shown that after polarization of hppe composites modified with pha and ophd organic fillers, the depolarization process begins in connection with the resolution and release of trapped charge carriers from traps. After the complete destruction of the homo charges, the density of the surface charge of the hppe films and their optimal modification, reaching a certain value, in the future, depending on the duration of storage, does not change. It was also revealed that the introduction of the organic additive pha and ophd into hppe makes it possible to obtain an antistatic polymer material with improved technological and electrical properties.

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Influence of chemical modification of the surface of low-density polyethylene on its electret properties

Cited by 14 publications

References 1 publication

Treatment with orthophosphoric acid enhances the thermal stability of the piezoelectricity in low-density polyethylene ferroelectrets

Treatment with orthophosphoric acid enhances the thermal stability of the piezoelectricity in low-density polyethylene ferroelectrets

On the Silica Surface Modification and Its Effect on Charge Trapping and Transport in PP-Based Dielectric Nanocomposites

Influence of organic additives on electret state of high pressure polyethylene

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