Conformation of Arborescent Polymers in Solution by Small-Angle Neutron Scattering: Segment Density and Core−Shell Morphology
Bibliographic record
Abstract
High Resolution Image Download MS PowerPoint Slide The radius of gyration ( R g ) was determined as a function of generation number for arborescent polystyrenes with two different side chain mass average molecular mass ( M w ≈ 5000, 5K, versus 30 000, 30K) by small-angle neutron scattering (SANS) measurements. The R g values obtained were analyzed in terms of the Zimm−Stockmayer model for randomly branched polymers, the scaling relation R g ∝ M w v, and the expansion factor α s = ( R g ) goodsolvent /( R g ) ϑ solvent . The R g and scaling exponent v = 0.26 ± 0.01 found for G0 through G3 polymers with 5K side chains in cyclohexane- d correspond to the values predicted by the Zimm−Stockmayer model. The R g for G0 through G3 polymers with 30K side chains deviate from the model with v = 0.32 ± 0.02, corresponding to v = 0.33 expected for hard spheres. Deuterated polystyrene (PS- d ) side chains were grafted onto G2 and G3 polystyrene (PS) cores. These copolymers, G2PS- graft -PS- d and G3PS- graft -PS- d, were characterized as spheres with a well-defined PS core−PS- d shell structure by the SANS contrast matching method. The shape and the segment radial density profile of the core and shell for GPS- graft -PS- d were determined based on P(r ) and Δρ( r ) obtained by indirect Fourier transformation and deconvolution methods ( P(r ), pair distance distribution function and Δρ( r ) = ρ( r ) − ρ(solvent), scattering length density contrast profile).
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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".