Single Crystals of Chain-Folded Copolyterephthalamides
Bibliographic record
Abstract
Crystallization of copolyaramides composed of rigid poly( p -phenylene terephthalamide) segments (containing 3−11 aromatic cycles) and short amine aliphatic chains (5−10 CH 2 groups) was studied. Crystallization was induced at room temperature by slow saturation with methanol vapors of sulfuric acid solutions. In electron diffraction, the 3AR6DA, which has monodisperse rigid blocks, exhibits weak but typical single crystal diffraction, with relatively sharp diffraction spots. Other wARnDAs, for which the rigid blocks are polydisperse, show a similar diffraction diagram albeit with lower resolution and considerable peak broadening, indicating that considerable disruption of the crystal phase has taken place. All observed diagrams correspond to the hk 0 level, and chains are perpendicular to the lamellar plane. Atomic force microscopy observations show that most crystals are multilamellar, the thickness of each lamella increasing regularly with the number of aromatic groups in the rigid segment. The average lamellar thickness value is in agreement with the expected rigid segment length. It is therefore concluded that the addition of a short aliphatic chain fragment allows chain folding to occur.
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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".