Thermal depolarization current study of polypyromellitimide

Tanaka, Toshiaki; Hirabayashi, Shoji; Shibayama, Kyōichi

doi:10.1063/1.324657

Cited by 50 publications

(17 citation statements)

References 21 publications

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“…The current maxima corresponding to α-relaxation in the TSDC spectrum of pristine Kapton-H have been reported to be ∼180-200 • C [14,15]. This relaxation, which is more prominent in high E p /T p samples, has been mainly attributed to the space charge polarization relaxation process.…”

Section: Discussionmentioning

confidence: 93%

“…In pristine Kapton-H polyimide, two major transitions termed as β and α have been reported [14][15][16]. These transitions have been assigned to the electric dipole orientation Downloaded by [McMaster University] at 09:54 15 June 2016 polarization from the cooperative molecular motion of the residual reactive groups and space charge polarization, respectively.…”

Section: Discussionmentioning

confidence: 97%

“…The various current maxima appearing in the TSDC spectrum characterize the operative molecular mechanisms through which an electret stores its charge. A detailed study of the TSDC characteristics of pristine Kapton-H polyimide has already been carried out [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

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Thermally stimulated depolarization current behaviour of 75 MeV oxygen ion irradiated Kapton-H polyimide film

Prabha

Quamara

2005

Radiation Effects and Defects in Solids

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The thermally stimulated depolarization current (TSDC) technique has been used to investigate the various dielectric relaxation processes in high-energy ion irradiated Kapton-H polyimide. The 25 µm thick Kapton-H samples were irradiated with 75 MeV oxygen ions (fluences: 1.88 × 10 11 , 1.88 × 10 12 , 1.88 × 10 13 , 5.63 × 10 12 ions/cm 2 ) at the Nuclear Science Center (Pelletron Facility), New Delhi. The TSDC characteristics were obtained at a linear heating rate of 2 • C/min for different poling temperatures varying from 80 to 250 • C and poling fields from 160 to 400 kV/cm. The TSDC spectra mainly consist of four current maxima, viz. γ , β, α and ρ in the increasing order of temperature. The γ -relaxation has been attributed to the increased water absorptivity in Kapton-H due to irradiation. The demerization of carbonyl groups, cross-linking of imide groups and formation of free radicals due to energetic heavy ion irradiation in Kapton-H polyimide have been held responsible to govern the behaviour of β, α and ρ relaxations. In the vicinity of the β-relaxation, a new relaxation process, termed as δ-relaxation, is also observed. The activation energy values (0.78, 0.60, 1.04 and 1.32 eV for γ , β, α and ρ relaxations, respectively) for different relaxations were calculated by the Bucci plot method.

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Section: Discussionmentioning

confidence: 93%

Section: Discussionmentioning

confidence: 97%

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Thermally stimulated depolarization current behaviour of 75 MeV oxygen ion irradiated Kapton-H polyimide film

Prabha

Quamara

2005

Radiation Effects and Defects in Solids

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“…• C, and which corresponds according to the literature to a bulk space-charge relaxation [26,[40][41][42]. When decreasing the frequency, the α-relaxation shifts towards lower temperatures and the lowest frequency polarization phenomena appear.…”

Section: Fig 1 (Color Online)mentioning

confidence: 99%

Dielectric measurements in large frequency and temperature ranges of an aromatic polymer

Diaham

Locatelli

Lebey

et al. 2009

Eur. Phys. J. Appl. Phys.

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Abstract. The characterization of the BPDA/PDA polyimide (PI) at high temperature up to 400• C, thanks to dielectric relaxation spectroscopy (DRS) in the 10 −1 Hz to 10 6 Hz frequency range, allows the determination of the dc electrical conductivity (σ dc ). In such a high temperature range, the dielectric spectra are modified by the extrinsic electrode polarization phenomenon (EP) response. A model is proposed which coupled to the DRS results allows evidencing and quantifying the effect of the EP. The proposed method gives a simple way to determine the intrinsic σ dc values from the effective ac dielectric response, improving the accuracy and reducing the duration of measurement.

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“…In kapton-H polyimide, the existence of shallow and deep trap levels has already been discussed [4,19]. The origin of shallow traps, although not fully established, and some of the factors, viz.…”

Section: Pristine Kapton-h Samplesmentioning

confidence: 97%

Thermally stimulated discharge current studies of corona polarized pristine and swift heavy ion irradiated kapton-H polyimide

Sharama

Garg

Quamara

2006

Radiation Effects and Defects in Solids

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Thermally stimulated discharge (tsd) current technique has been used to investigate the corona polarized pristine and swift heavy ion irradiated kapton-H polyimide. The samples of thickness 25 µm were irradiated with 100 MeV Fe + beam (fluence: 1.8 × 10 11 , 2.3 × 10 12 and 1.4 × 10 13 ions/cm 2 ). Corona charged pristine kapton-H samples show two tsd current peaks (P 1 and P 2 ) ∼40-70 and 150-190 • C, respectively. The peak P 1 is in the normal current direction and P 2 is in the abnormal current direction. These peaks are attributed to space charge relaxation process owing to the surface and bulk energy traps, respectively. Thex/d value (x is the mean penetration depth and d is the thickness of the sample) estimated for pristine kapton-H polyimide comes out to be 0.32 and suggests that the space charge distribution is approximated by space charge limited current (SCLC) distribution. However, the SCLC distribution in irradiated sample is not confirmed by largex/d value (0.86). The activation energies estimated from Bucci plot method for peaks P 1 and P 2 vary from 0.66 to 0.97 eV and from 0.92 to 1.31 eV, respectively, depending on the corona voltage. The charge trapping density for surface and bulk traps comes out to be (0.3-10.2) × 10 17 and (4.9-14.6) × 10 17 m −3 , respectively. In the irradiated samples, abnormal tsd currents dominate and there is an enhancement in the bulk charge trapping density (13.2 × 10 18 m −3 ). This enhancement is due to the formation of double/triple bonds and free radicals in irradiated samples. The irradiated corona polarized samples after prolonged aging (10-30 days) show a high temperature maximum with average activation energy of 0.90 eV. This current maximum has been associated with the space charge relaxation process due to bulk deep charge trapping levels.

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Thermal depolarization current study of polypyromellitimide

Abstract: Study of the α and β relaxations on a commercial poly(vinyl chloride) by thermally stimulated creep and depolarization current techniquesThermally stimulated depolarization current studies of poly(ethylene oxide) and poly(ethylene oxide) complexed with potassium thiocyanate

Cited by 50 publications

References 21 publications

Thermally stimulated depolarization current behaviour of 75 MeV oxygen ion irradiated Kapton-H polyimide film

Thermally stimulated depolarization current behaviour of 75 MeV oxygen ion irradiated Kapton-H polyimide film

Dielectric measurements in large frequency and temperature ranges of an aromatic polymer

Thermally stimulated discharge current studies of corona polarized pristine and swift heavy ion irradiated kapton-H polyimide

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