Fiber-like Micelles via the Crystallization-Driven Solution Self-Assembly of Poly(3-hexylthiophene)-<i>block</i>-Poly(methyl methacrylate) Copolymers
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Bibliographic record
Abstract
The solution self-assembly of block copolymers with a π-conjugated, crystalline, core-forming block represents a facile strategy toward the preparation of semiconducting nanowires with potential for high-tech applications. In this study, two asymmetric block copolymers based on regioregular poly(3-hexylthiophene) (P3HT) and poly(methyl methacrylate) (PMMA), namely P3HT 40 - b -PMMA 520 ( 6a ) and P3HT 40 - b -PMMA 1100 ( 6b ) (block ratios = 1:13 and 1:27.5, respectively) were prepared via atom transfer radical polymerization (ATRP) from a P3HT macroinitiator. The solution self-assembly of the P3HT- b -PMMA block copolymers was subsequently studied under a variety of experimental conditions. Short, fiber-like micelles resulted when THF (common solvent for P3HT and PMMA) solutions of the block copolymer were dialyzed against ethyl acetate and n -butyl acetate (selective solvents for PMMA). The electronic properties of the fiber-like micelles obtained coupled with wide-angle X-ray scattering studies confirmed that the cores of the aggregates were crystalline and suggested that growth occurs via a crystallization-driven pathway. The average lengths of fiber-like micelles were shown to increase relative to those obtained from dialysis versus the PMMA selective solvent, when THF was slowly evaporated from mixtures containing n -butyl acetate and P3HT- b -PMMA unimers, thereby limiting the rate of P3HT aggregation. Furthermore, the formation of only relatively short (mainly under 200 nm, always <1 μm) fiber-like micelles in these studies, even when the ratio of THF/alkyl acetate was controlled carefully via dialysis or evaporation, indicated that homogeneous nucleation of P3HT- b -PMMA block copolymers is relatively facile. This behavior differs significantly from that detected for other block copolymers such as polyferrocenylsilane-based materials that undergo crystallization-driven self-assembly to form cylinders with lengths of up to 10 μm under analogous conditions.
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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) | 0.001 | 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