Formation and Investigation of Corona Charged Films from Polylactic Acid

Gencheva, E. A.; Yovcheva, T.; Marudova, Maria; Viraneva, A.; Bodurov, I; Mekishev, G.; Sainov, S.

doi:10.1063/1.3322494

Cited by 10 publications

(3 citation statements)

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“…PLA has insufficient electret properties-low initial surface potential value and fast charge relaxation (Galikhanov et al 2016;Gencheva et al 2010;Zhang et al 2020). Polar groups of the polymer promote trapping of the injected charge carriers by small shallow traps which results in a fast charge decay of the corona electrets.…”

Section: Resultsmentioning

confidence: 99%

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Studying properties of corona electret based on compositions of polylactic acid and bentonite

Zagidullina

Kamalova

Галиханов

et al. 2021

Physics of Complex Systems

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The study focuses on the composites of polylactic acid and bentonite as well as corona electrets based on them. The paper explores rheological, electrical, physical and mechanical properties of the composites as well as the effect of corona charging on their properties. Differential scanning calorimetry was used to assess transition temperatures in the compositions. Surface potential, electric field strength and effective surface charge density were measured. Optimal performance was shown by the compositions of polylactic acid with 4% bentonite.

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Section: Resultsmentioning

confidence: 99%

“…(Galikhanov et al 2014;Kestelman et al 2000;Sessler 1998). In this context production of electret material based on polylactic acid is promising (Galikhanov et al 2016;Gencheva et al 2010;Zhang et al 2020). However, unipolar corona discharge as the fastest and simplest method to obtain an electret is not suitable for polar polylactic acid.…”

Section: Introductionmentioning

confidence: 99%

Studying properties of corona electret based on compositions of polylactic acid and bentonite

Zagidullina

Kamalova

Галиханов

et al. 2021

Physics of Complex Systems

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“…PLA possesses polar uniaxial orientation of molecular dipoles and shows electro‐active properties such as shear piezoelectricity 4. Corona‐charged polylactic acid films with different degree of crystalline were investigated in respect to their electret properties 5. The results obtained show that films with preliminary determined surface potential values could be formed through changing of the degree of crystallization, corona charging conditions, and lower pressure values.…”

Section: Introductionmentioning

confidence: 99%

Effect of gamma‐irradiation on the electret properties of poly(L‐lactide)

Yovcheva

Marudova

Viraneva

et al. 2012

J of Applied Polymer Sci

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Electret stability of poly(L-lactide) (PLA) films, gamma-irradiated up to 100 kGy has been investigated by measuring the surface potential during the storage period. PLA samples-40-lm thick films-were prepared by the casting method and then irradiated in a 60 Co radiation facility at a dose rate of 0.25 kGy/h. The structural changes during the irradiation were estimated by viscometric, differential scanning calorimetry and scanning electron microscope measurements. Random chain scission and appearance of end radicals are the most probable results of the irradiation process. After irradiation, the samples were charged in a corona discharge system and surface potential was measured by the method of the vibrating electrode with compensation. The values of the surface potential of the irradiated samples were higher in comparison with the non-irradiated samples. This effect could be related to the degradation of the macromolecules and changes in the crystal state of PLA during the irradiation. Both of the mentioned factors lead to structural defects that increase the number of discrete trapping levels. The effect of low pressure on the surface potential drop was also investigated.

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