The Effect of Aging Time in Dispersion on Polymer Diffusion in Films Formed From a Waterborne 2-Component Polyurethane Formulation
Bibliographic record
Abstract
Waterborne polyurethane coatings are environmentally friendly alternatives to their solventborne counterparts. Waterborne 2-component polyurethane coatings comprise polyol nanoparticles and polyisocyanates (PIC) and are of great interest due to their excellent mechanical properties. I used fluorescence resonance energy transfer to study polymer diffusion in films formed from a dispersion consisting of a polyol latex containing primary hydroxyl groups (Mn(GPC) ≈ 5000 g/mol, Đ ≈ 2, Tg ≈ 15 °C) and a hydrophilically modified PIC (hmPIC) (Basonate® HW1000). My contribution was to examine the effect of aging time in the dispersion before applying the coating. I found that aging dispersions of the polyol plus hmPIC up to 9 h did not reduce hmPIC effectiveness in the coating. After 9 h of aging in the dispersion, a substantial fraction of the isocyanate groups had reacted with water, and the ability of the hmPIC to promote polymer diffusion in the films was greatly reduced.
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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 | 0.001 |
| 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".