Formation of Mesoglobular Phase of Amphiphilic Copolymer Chains in Dilute Solution: Effect of Comonomer Composition
Bibliographic record
Abstract
Homopolymer poly( N, N -dimethylacrylamide) (PDMA) is soluble in water, but poly( N, N -diethylacrylamide) (PDEA) and poly( N -ethylacrylamide) (PEA) are soluble only in cold water. The copolymers made of DEA and DMA or DEA and EA are hydrophilic at T < ∼32 °C, but become amphiphilic in the higher temperature range. The synthesis of two series of P(DEA- co -DMA) and P(DEA- co -EA) copolymers with a similar chain length, but different compositions (30 and 50 mol % of DMA and 40, 60, and 80 mol % of EA, respectively), enabled us to study the composition dependence of their association in water by laser light scattering. Our results showed that a limited number of these neutral copolymer chains could associate together to form stable mesoglobules existing between single-chain collapsed globules and macroscopic precipitation. Besides thermodynamical consideration, the formation of such mesoglobules can also be attributed to the competition between intrachain contraction and interchain association as well as the viscoelastic effect. Increasing the hydrophilic DMA or EA content leads to a larger average aggregation number, but increasing the heating rate results in smaller, but less dense, mesoglobules consisting of many loosely associated small single- or pauci-chain globules. For the copolymers with higher EA contents, we unexpectedly found that interchain association can gradually relax to intrachain association as time elapses.
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How this classification was reachedexpand
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) | 0.000 | 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, 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".