Orientation and Relaxation Study of Miscible Polystyrene/Poly(vinyl methyl ether) Blends
Bibliographic record
Abstract
The macroscopic deformation and relaxation of orientation of miscible polystyrene/poly(vinyl methyl ether) (PS/PVME) blends containing between 50 and 100% PS have been studied using polarization modulation infrared linear dichroism (PM-IRLD). PS/PVME films were stretched at T g + 15 to a draw ratio of 2, at constant draw rates of 10 and 100 cm/min. During the deformation, the addition of the lower molecular weight PVME to the blends leads to an important increase of the orientation function of PS. During the relaxation period, a fast decay of the PS orientation function occurs at short times, followed by a slow chain relaxation at longer times. The relaxation rate is faster in pure PS than in the blends, the increase of the PVME content leading to a hindered relaxation. The orientation function of PVME is small in all cases, but we have been able, for the first time, to measure directly its relaxation, which follows closely the trend observed for PS. However, no relaxation coupling can be clearly observed between the two polymers, the relaxation rate of PVME being always faster than that of PS. These results demonstrate the efficiency of PM-IRLD to determine quantitatively the time dependence of the orientation function of several chemical groups in multicomponent systems during the orientation and relaxation processes.
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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".