Investigation of Orientation and Relaxation in a Segmented Zwitterionomer by Fourier Transform Infrared Spectroscopy
Bibliographic record
Abstract
The orientation behavior of a segmented poly(tetramethylene oxide) (PTMO) zwitterionomer, with a narrow polydispersity PTMO segmental molecular weight of 5.2 × 10 3, a melting point of 17 °C, and elastomeric characteristics, was studied using infrared linear dichroism. The results obtained show that when the amorphous zwitterionomer is stretched at ambient temperature, the PTMO chains orient in the stretch direction. At a draw ratio of approximately 3, strain-induced crystallization occurs and increases with strain amplitude. The chain axis of the crystallized PTMO segments are almost perfectly oriented in the stretch direction, whereas the orientation of the amorphous segments is low and undergoes no further changes during crystallization. The degree of crystallization was also determined from the spectra (22% for a draw ratio of 5.6). The crystallization kinetics were shown to follow the Avrami equation, indicating one-dimensional growth ( n = 0.8). Orientation relaxation following deformation was also studied as a function of temperature at draw ratios and temperatures where strain-induced crystallization is avoided. Little orientation was detected in the ionic regions of the polymer during stretching. The orientation function for the PTMO soft blocks decreases, and the relaxation rate increases with increasing temperature. Time−temperature superposition of the relaxation curves is discussed in relation to the hard (or cluster) phase transition.
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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".