Self-Seeding of Block Copolymers with a π-Conjugated Oligo(<i>p</i>-phenylenevinylene) Segment: A Versatile Route toward Monodisperse Fiber-like Nanostructures
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Bibliographic record
Abstract
Three well-defined crystalline–coil diblock copolymers of oligo(p-phenylenevinylene)-b-poly(N-isopropylacrylamide) (OPV5-b-PNIPAM18, OPV5-b-PNIPAM49, and OPV5-b-PNIPAM75; the subscripts represent the number of repeat units of each block) with the same crystallizable core-forming OPV segment but different corona-forming PNIPAM blocks of various chain lengths were synthesized. Their solution self-assembly behavior was examined in methanol, ethanol, and isopropanol. Both the solvent and the length of the PNIPAM block were found to affect the self-assembly of the block copolymers. In methanol, OPV5-b-PNIPAM18 formed a mixture of fiber-like micelles of uniform width and two-dimensional platelet-like structures with fiber-like micelles protruding from the ends. In ethanol and in isopropanol, this polymer only formed long fiber-like micelles of uniform width. OPV5-b-PNIPAM49 formed long fiber-like micelles (several micrometers) of uniform width in all three solvents, but under the same self-assembly conditions, OPV5-b-PNIPAM75 only formed short fiber-like micelles with lengths of several hundred nanometers. We systematically examined the temperature-induced self-seeding behavior of all three block copolymers, exploring the influence of PNIPAM chain length, solvent, annealing time, and concentration of copolymer. The most remarkable result of these experiments is our finding that fiber-like micelles of uniform length with controlled lengths up to 1 μm can be easily prepared from all three block copolymers, even from OPV5-b-PNIPAM75 that formed only much shorter micelles under self-nucleated self-assembly. We also showed that the self-seeding strategy can be extended to other OPV-containing diblock copolymer such as OPV5-b-poly(2-(diethylamino)ethyl methacrylate) for preparing monodisperse fiber-like micelles of controllable length. These results show that the self-seeding approach to crystallization-driven self-assembly can be a versatile route to prepare uniform fiber-like micelles with controllable lengths for OPV-containing block copolymers.
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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