Structural Study of the Thermochromic Transition in Poly(2,5-dialkyl-<i>p</i>-phenyleneethynylene)s
Bibliographic record
Abstract
The solvatochromic and thermochromic properties of poly(2,5-di-2‘-ethylhexyl- p -phenyleneethynylene) have been investigated. While some important changes were observed in UV−vis absorption, calorimetric, and X-ray measurements, temperature-dependent FTIR, Raman, and solid-state NMR spectra did not reveal any significant shift of the peaks associated with the polymer backbone. These results suggest that the chromic effects are not mainly governed by conformational changes of the polymer. From these data and ab initio calculations performed on model compounds, it is believed that the thermochromic transition proceeds from aggregated polymers at room temperature to “free” (weakly interacting) polymer chains at higher temperatures.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| 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) | 0.000 | 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 teacher head, 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".