Alkaline solvothermal debromination of commercial brominated acrylonitrile butadiene styrene (ABS)
Why this work is in the frame
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Bibliographic record
Abstract
Acrylonitrile-butadiene-styrene (ABS) is one of the most common thermoplastics and for decades, brominated fire retardants (BFR) were the primary compounds added to comply with fire safety regulations in electronic and electrical polymeric components. BFRs are effective at low concentrations, are stable up to 250 °C (sufficient for thermoplastic processes such as injection moulding), and are compatible with polymers (easy addition). However, their hazardous nature and environmental persistence sparked concerns about their use, which limits the possibility of recycling them. Currently, most of them are banned or have limitations on their application and concentration. Here, we report an alkaline solvothermal treatment to debrominate commercial ABS from end-of-life products (up to 97 %). The process operates between 160 °C to 190 °C with ethylene-glycol as solvent and KOH as extraction agent (1 M ). It removes 95 % of the Br in 4 h above 160 °C and 97 % at T = 160 ∘ C and 24 h. FTIR spectroscopy confirms that 30 % of the acrylonitrile reacts to form acrylic acid in the most aggressive conditions. Curiously, the T g increases by up to 10 °C, which might improve the mechanical properties of the polymer.
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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 it