Synthesis of Arborescent Isoprene Homopolymers
Why this work is in the frame
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Bibliographic record
Abstract
A method was developed for the preparation of isoprene homopolymers with a dendritic architecture using an anionic “grafting onto” methodology. A linear polyisoprene substrate with a high (95%) 1,4-content was first epoxidized to introduce grafting sites randomly along the chain. Coupling of the epoxidized polyisoprene with polyisoprenyllithium yielded a comb-branched or generation G0 arborescent polyisoprene. N, N,N ‘, N ‘ -Tetramethylethylenediamine, BF 3, Me 3 Al, LiCl, and LiBr were investigated as promoters for the coupling reaction. Lithium salts were most effective, increasing the grafting yield from 78% to 92% for a linear substrate. Further epoxidation and grafting of the G0 polyisoprene led to arborescent isoprene homopolymers of generations G1 and G2. The attempted synthesis of a G3 arborescent polyisoprene was unsuccessful. The graft polymers were purified by precipitation fractionation and characterized by size exclusion chromatography (SEC), light scattering, and NMR spectroscopy. The products have narrow molecular weight distributions ( M w / M n ≤ 1.05) consistent with a uniform molecular size and display geometric increases in molecular weight and branching functionality for successive generations. The absolute weight-average molecular weight values determined from light scattering measurement are much higher than the apparent SEC values because of the highly branched structure of the molecules.
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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) | 0.005 | 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