Insights into the polymerization kinetics of thermoresponsive polytrimethylene carbonate bearing a methoxyethoxy side group
Why this work is in the frame
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Bibliographic record
Abstract
Abstract The ring‐opening polymerization kinetics of 5‐[2‐(2‐methoxyethoxy)‐ethoxymethyl]‐5‐methyl‐1,3‐dioxa‐2‐one (TMOE‐2) and 5‐[2‐{2‐(2‐methoxyethoxy)ethyoxy}‐ethoxymethyl]‐5‐methyl‐1,3‐dioxa‐2‐one (TMOE‐3) was investigated using different catalysts with the aim to improve control over molecular weight. The possibility of monomer impurities driving the variability in molecular weight that has been seen in different reports, was assessed and evidence of catalysis via an imidazole impurity was found. The catalysts 1,5,7‐triazobicyclo(4.4.0)dec‐5‐ene (TBD), hydrogen chloride in diethyl ether (HCl·Et 2 O), stannous 2‐ethylhexanoate (SnOct 2 ), and catalyst free thermal polymerizations were conducted to understand the mechanisms influencing the molecular weight. TBD and HCl·Et 2 O consistently achieved high conversion of the monomer; however, molecular weights greater than 7,000 Da could not be achieved due to competing side reactions. SnOct 2 catalyzed and catalyst free thermal polymerizations were highly influenced by monomer purity and achieved lower conversion than TBD and HCl·Et 2 O. Understanding these mechanisms will guide future synthesis of poly(TMOE‐2) and poly(TMOE‐3) for biomedical applications.
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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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.001 |
| 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 it