Block Ionomer Complexes with Polystyrene Core-Forming Block in Selective Solvents of Various Polarities. 1. Solution Behavior and Self-Assembly in Aqueous Media
Bibliographic record
Abstract
The self-assembly behavior of cationic block copolymers of polystyrene- block -poly( N -ethyl-4-vinylpyridinium bromide) (PS- b -PE4VP) with the constant length of PS block (100 units) and varying lengths of ionic PE4VP block (100−500 units) in aqueous dispersions was studied by fluorescence spectroscopy and sedimentation velocity techniques. The values of cmc for PS- b -PE4VP copolymers were within the range 10 -7 −10 -6 M and only slightly increased as the ionic chain length increased. At the concentrations above cmc, a coexistence of the micelles and micellar clusters formed by PS- b -PE4VP copolymers was observed. The distribution of copolymer chains between the micelles and micellar clusters was found to be independent of copolymer concentration and length of ionic PE4VP block but dependent on the concentration of the elementary salt in the solution. Interaction of PS- b -PE4VP micellar aggregates with the oppositely charged surfactant, sodium bis(2-ethylhexyl) sulfosuccinate (AOT), was studied. In contrast to homopolyelectrolyte−surfactant systems that form only stoichiometric insoluble complexes, the formation of insoluble nonstoichiometric and stoichiometric PS- b -PE4VP/AOT complexes was observed. The composition of insoluble PS- b -PE4VP/AOT complexes strongly depends on the length of ionic PE4VP block. Such a difference in behavior of block copolymer-based complexes has been attributed to the presence of block copolymer micelles upon interaction with surfactant ions compared to the individual polymer chains that interact with the surfactant in the case of ionic homopolymer.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 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) | 0.002 | 0.001 |
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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".