Effect of Solvent Quality toward the Association of Succinimide Pendants of a Modified Ethylene−Propylene Copolymer in Mixtures of Toluene and Hexane
Bibliographic record
Abstract
A maleated ethylene−propylene random copolymer (EP) was reacted with 1-pyrenemethylamine to yield a pyrene labeled EP, and the photophysical properties of the pyrene label were used to determine the level of aggregation between the resulting succinimide groups as a function of the composition of hexane/toluene mixtures. In hexane, the polar succinimides bearing the pyrenyl pendants form aggregates whose presence can be inferred from fluorescence and UV−vis absorption measurements. Addition of toluene is found to melt the pyrene aggregates. The aggregation induced by the polar succinimide groups was shown to occur intramolecularly at polymer concentrations of 0.1 g/L by fluorescence resonance energy transfer. The level of pyrene aggregation ( f agg ) was determined quantitatively and could be followed as a function of the volume fraction of hexane in a series of toluene/hexane mixtures. Upon addition of toluene, the parameter f agg decreased rapidly to a finite value different from 0.0 due to the inherent clustering of succinic anhydride groups occurring during the maleation of EP. This lowest f agg value was reached for a mixture containing 60 vol % of hexane. The ability of toluene at melting the pyrene aggregates was shown to have a profound effect on the rheological properties of the polymer solutions.
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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) | 0.001 | 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".