Solution Properties of Polyvinylamine Derivatized with Phenylboronic Acid
Bibliographic record
Abstract
The phase behavior and surface tension of aqueous, linear polyvinylamine (PVAm) bearing pendant phenylboronic acid moieties (PBA) were measured as functions of pH and the degree of PBA substitution. Coupling of PBA with 4% of the nitrogen on low molecular weight (15 kDa) PVAm gave water-soluble copolymer from pH 1 to 12. By contrast, derivatives of 150 kDa PVAm phased separated at pH 9 with as little as 4% derivatization. The pH ranges over which phase separation occurred increased with PBA substitution. The copolymer based on 51% substitution was insoluble over most of the pH range. Electrophoresis and potentiometric titration confirmed that the copolymers were amphoteric with isoelectric points around pH 9.5. The hydrophobicity of the copolymers was reflected in the significant lowering of surface tension, particularly at high pH. Finally fructose, which binds to borate, influenced the titration curves but did not influence surface tension.
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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".