Synthesis of β-Myrcene-Based Polymers and Styrene Block and Statistical Copolymers by SG1 Nitroxide-Mediated Controlled Radical Polymerization
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Bibliographic record
Abstract
Nitroxide-mediated polymerization (NMP) of β-myrcene ( My ) at 120 °C in bulk using unimolecular SG1-based succinimidyl ester-functionalized BlocBuilder (BB) alkoxyamine resulted in low dispersity ( Đ = 1.1–1.4) poly(myrcene)s P( My )s with high SG1 chain-end fidelity. The polymerizations also showed the number-average molecular weights ( M n ) increased almost linearly with conversion. SG1-terminated P( My ) macroinitiators were cleanly chain-extended with styrene (S) and the S-rich P( My - b -S) diblock copolymers exhibited two distinct glass transition temperatures ( T g s), indicative of microphase separation. P( My - b -S) diblocks showed brittle stress–strain behavior, plausibly due to relatively low M n . My /S mixtures with initial S molar feed compositions f S,0 = 0.10–0.94 were also statistically copolymerized ( M n = 8.2–19.8 kg mol –1, Đ ≤ 1.37, and monomodal distributions). Copolymer reactivity ratios were r S = 0.25 ± 0.04/0.34 ± 0.19 and r My = 1.88 ± 0.12/2.19 ± 0.07 using Fineman–Ross and Kelen–Tüdös methods. The statistical P( My - stat -S) copolymers displayed a range of T g s (−77 to +30 °C) depending on My molar fraction. My -rich and S-rich P( My - stat -S)s were then successfully chain-extended with both S and My .
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| 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