Effect of solvent on properties of solution‐cast dense SPPO films
Bibliographic record
Abstract
Abstract The effect of solvent on properties of solution‐cast dense films was investigated using high molecular weight sulfonated poly(2,6‐dimethyl‐1,4‐phenylene oxide) (SPPO) and five different solvents having relatively similar molar volumes. The study revealed that polymer–solvent interactions existing in casting solution primarily determine the concentration of residual solvent and surface morphology of the films. On the other hand, the O 2 and CO 2 permeabilities, which for most permeable films were more than three times greater than for the least permeable ones, appear to be governed by the volatility of solvent in casting solution. At the same time, the more permeable films showed lower O 2 /N 2 and CO 2 /CH 4 permeability ratios than the less permeable ones. In addition to physical factors such as polymer–solvent interactions and volatility of solvent in casting solution, the differences in gas transport properties of SPPO films could arise from the formation of quaternary salts—in particular, in the case of films prepared from the pyridine solution. The analysis of casting solution properties, surface images by atomic force microscopy, and gas transport properties allowed us to associate defective structures of some SPPO films with a specific surface morphology and a particular combination of solvent properties. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 88: 1100–1110, 2003
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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 | 0.001 | 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".