Solution Properties of a Thermosensitive Triblock Copolymer of <i>N</i>-Alkyl Substituted Acrylamides
Bibliographic record
Abstract
An ABC triblock copolymer PnPA(124)-b-PiPA80-b-PEMA(44) was synthesized by a sequential three-step reversible addition-fragmentation chain transfer (RAFT) polymerization of N-n-propylacrylamide (nPA), N-isopropylacrylamide (iPA), and N,N-ethylmethylacrylamide (EMA). The thermoresponsive characteristics of the aqueous solution of the triblock copolymer have been studied in comparison with the corresponding mono- and diblocks by UV-visible and NMR spectroscopies, differential scanning calorimetry, and dynamic light scattering. The hydrophilicity of the blocks influences each other, rendering each block a phase transition temperature different from that of the corresponding homopolymers. The cloud points of the three steps of the phase separations were determined to be 31.5, 46.8, and 57.6 degrees C for steps one to three, respectively, while heating the aqueous solution of the triblock copolymer. At approximately 31 degrees C, the PnPA block started to dehydrate, causing the formation of micelles with the PnPA block as the core, dehydrated PiPA as the shell, and water-soluble PEMA block as the corona. The collapse of the dehydrated PiPA block was restricted by the shielding and stretching effect of the neighboring soluble PEMA block, and the resultant micelles had a high water content in their hydrodynamic volume. Continued increase in temperature to approximately 47 degrees C caused further dehydration of the micelles, and the final collapse of the third block of PEMA at approximately 58 degrees C led to further aggregation of the micelles.
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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 | 0.000 |
| 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 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".