Relaxation processes in aromatic polyimide
Bibliographic record
Abstract
Electrical conduction in non-conjugated insulating polymers such as Kapton (R) films was studied as a function of temperature, T (15–500 K) and electric field F (⩽16 kV cm −1 ). The time dependent isothermal transient currents (ITC) were also studied at different temperatures (15 K< T <500 K). Thermally stimulated discharge current (TSDC) studies were carried out as a function of initial poling conditions. A distinct change in conduction mechanism as a function of T was observed at T ⩾300 K from DC conductivity, ITC and TSDC measurements. The origin of this behaviour is discussed in terms of transition of dipolar at low T to space charge mechanism at high T which can be attributed to carrier trapping and release of charge carriers from the trap states. The effective barrier energy, Δ, for transport and hopping parameter λ( T ) are estimated for Kapton on the basis of these studies. The results obtained for Kapton suggest that, for T < T g at low or moderate fields, the transient currents are essentially governed by dipolar relaxation mechanisms.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".