Determination of Mutual Diffusion Coefficients at Nonsymmetric Polymer/Polymer Interfaces from Rheometry
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Bibliographic record
Abstract
A novel method for determining the mutual diffusion coefficient using rheometry is presented. The method includes mathematical modeling for mutual diffusion at polymer/polymer interfaces and experimental determination of material parameters for the model. The model combines the concepts of the reptation theory and the fast-mode model applied to miscible dissimilar polymers brought into intimate contact in the molten state. The material parameters for the model are obtained from experiments in which the dynamic complex shear modulus, G *, is measured in parallel-plate geometry under small amplitude of deformation as a function of time and frequency for a sandwich-like assembly. The technique was applied to the poly(methyl methacrylate) (PMMA)/poly(styrene acrylonitrile) (SAN) system, and the measured mutual diffusion coefficient was found to be in agreement with the values reported in the literature for the same system.
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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) | 0.001 | 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.
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