Kinetics and Mechanism of Formaldehyde-Free Phenol-Glucose Novolac Resin Cured with an Epoxy
Bibliographic record
Abstract
Abstract Formaldehyde used in manufacture and curing of phenol formaldehyde (PF) resins is a big challenge for the PF industry with respect to sustainability and human health. Glucose has grand potential to replace formaldehyde in synthesis of bio-based phenolic novolac resins curable with hexamethylenetetramine (HMTA, derived from formaldehyde), an obstacle to achieve formaldehyde-free curing. This study reports the curing of phenol-glucose novolac resin with a bis-phenol-A type epoxy without using HMTA. The curing process was investigated by using dynamic differential scanning calorimetry measurements at different heating rates. Apparent activation energy of the curing reaction is 109.6 kJ/mol. Sestak–Berggren equation model was determined to be the reaction model according to Málek methods. The model-predicted reaction rates showed a good agreement with the experimental results. The results showed that the curing process was complicated; the kinetics expression was shown to be first-order autocatalytic reaction.
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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 | 0.001 |
| 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 | 0.001 | 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".