Analyses of Behaviour of PP Corona Electrets Stored at Low Pressure

Viraneva, A.; Yovcheva, T.; Pisanova, E. S.; Gencheva, E. A.; Mekishev, G.

doi:10.1063/1.3322472

Cited by 6 publications

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The surface potential values at a pressure of 0.1 mbar are higher for the non‐irradiated PLA samples charged in a positive corona than those for PLA gamma‐irradiated samples, independently of the irradiation dose (5 or 100 kGy). The experimental results are well described by the equation, analyzed in Ref 26…”

Section: Resultsmentioning

confidence: 68%

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

Yovcheva

Marudova

Viraneva

et al. 2012

J of Applied Polymer Sci

View full text Add to dashboard Cite

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.

show abstract

Section: Resultsmentioning

confidence: 68%