Small-Angle Neutron Scattering of Blends of Arborescent Polystyrenes
Bibliographic record
Abstract
Small-angle neutron scattering (SANS) was used to measure the size and shape of styrene-based arborescent polymers blended with linear deuterated polystyrene (d-PS) and linear deuterated poly(vinyl methyl ether) (d-PVME). For generation 0, 1, and 2 arborescent polymers, the R g were essentially equivalent in going from d-PVME to d-PS as the matrix material while for generation 3 (G3) the R g in d-PS was found to be smaller than in d-PVME. For comparison, the R g of a sphere was calculated assuming the size of the sphere was equivalent to a G3 molecule collapsed to bulk density. The R g obtained was 162 Å, which is quite close to the R g of the G3 polymer in d-PS ( R g = 164 Å). This indicates that the G3 molecules should behave as essentially noninterpenetrating spheres with the linear d-PS matrix chains being largely excluded from the interior of the arborescent molecules. In the single phase region of the phase diagram it was difficult to establish a clear temperature dependence of the R g for the generation 0, 1, and 2 molecules in d-PVME. For the G3 molecules in d-PVME a small decrease in R g with increasing temperature was observed in the single phase region with an abrupt decrease of 21% on phase separation between 110 and 115 °C. The single particle form factor of arborescent polymers in blends was studied using a power law model for the density profile. In comparison with a hard sphere or a shell model, the scattering function calculated from the power law function for the density profile provided the best fit to the experimental scattering data.
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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) | 0.002 | 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".