A simple apparatus to measure thermally stimulated depolarisation currents above 5K

Ronarc'h, D.; Testard, O.

doi:10.1088/0022-3735/15/6/009

Cited by 10 publications

(3 citation statements)

References 4 publications

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“…As Ronach and Testard [92] explain, low temperature relaxations arise from low-amplitude motions which occur around the available free volume cause the relaxations to be characterized by low intensity discharges, by small activation enthalpies and by negligible activation entropies. The breadth is related to the spacer length especially for the side chain PLCs arises from the increased number of possible conformations due to increased methylene groups and leads to reorientation of the side chain group.…”

Section: Comb Thermotropic Plcsmentioning

confidence: 99%

Thermally Stimulated Depolarization Current

D’Souza

2000

International Journal of Polymeric Materials

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Section: Comb Thermotropic Plcsmentioning

confidence: 99%

Thermally Stimulated Depolarization Current

D’Souza

2000

International Journal of Polymeric Materials

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Section: Introductionmentioning

confidence: 99%

“…There are a few experimental TSDC setups, fabricated in laboratory [25][26][27][28][29][30][31][32]. Ronare et al designed the system for very low temperature range of 5-200 K with TW capability for polymer samples of thickness up to 250 μm [27]. Roos and Keyzer [28] and Jackson et al [29] have designed low current sensitive systems suitable for large temperature ranges of 3.5-450 K and 77-523 K, respectively.…”

Section: Introductionmentioning

confidence: 99%

Low temperature thermal windowing (TW) thermally stimulated depolarization current (TSDC) setup

Jain

Chandra

Nath

et al. 2012

Meas. Sci. Technol.

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We report here the design and implementation of a precise and easy to operate thermally stimulated depolarization current (TSDC) measurement setup for temperature range 77–400 K. The sample loading is made simple by sandwiching the sample between two copper disk electrodes using a spring-shaft arrangement. The salient features of the setup are precise thermal windowing (TW) capability and linear heating rate over the entire temperature range. The resolution in the measurement of depolarization current is of the order of 7×10−14 A. This is achieved by means of good electrical insulation of the electrodes from the rest of the setup and utilization of low noise circuitry. Precision of the system is demonstrated by its capability to resolve constituent relaxations present in complex relaxation processes using the TW experiments. Study and detection of glass transition processes in polyethylene terephthalate, four relaxation processes in polymethyl methacrylate, glass and crystallization transitions along with the onset of ferroelectric Curie transitions in polyvinylidene fluoride and characterization of electret state in amino acids l-arginine, phenylalanine, tyrosine, tryptophan, glutamic acid, glutamine and methionine show the versatility of our setup.

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Molecular motions in a side‐chain liquid‐crystalline polymethacrylate. A thermally stimulated currents study of the dipolar relaxations in the vitreous and liquid‐crystalline phases and at the glass transition

Mano¹,

Correia²,

Ramos³

et al. 1995

Macro Chemistry & Physics

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SUMMARYIn the present work we report the results of a Thermally Stimulated Discharge Currents (TSDC) study of a side-chain liquid-crystalline polymer. The different discharges observed in the TSDC spectrum have been analysed by the thermal sampling technique and have been attributed to specific relaxation mechanisms at the molecular level. A particular feature of the polymer studied in this work is that the mesogenic side group presents both longitudinal and transverse components of the dipole moment, and this seems to be at the origin of the presence of two separated relaxations in the liquid-crystalline phase.

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A simple apparatus to measure thermally stimulated depolarisation currents above 5K

Cited by 10 publications

References 4 publications

Thermally Stimulated Depolarization Current

Thermally Stimulated Depolarization Current

Low temperature thermal windowing (TW) thermally stimulated depolarization current (TSDC) setup

Molecular motions in a side‐chain liquid‐crystalline polymethacrylate. A thermally stimulated currents study of the dipolar relaxations in the vitreous and liquid‐crystalline phases and at the glass transition

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