Highly Fluorinated Aromatic−Aliphatic Copolyethers
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Bibliographic record
Abstract
A series of novel highly fluorinated aromatic−aliphatic copolyethers have been prepared by copolycondensation reactions of decafluorodiphenylsulfone (DFPSO) with hexafluorobisphenol-A (6F-BPA) and a highly fluorinated linear or branched diol (6C F -diol or 7 b C F -diol) at different feed ratios of [diol]/[6F-BPA]. The reactions can be completed in 2−5 h in the presence of CsF in DMAc at room temperature to produce polymers with number average molecular weight ( M n ) up to 45 000 Da. 1 H and 19 F NMR studies show that the composition of the resultant polymers agrees well with the feed ratio of the monomers in the reaction. This feature leads to a feasible tune of glass transition temperatures ( T g ) and refractive indexes of the produced polymers by a simple control of the feed ratio. As the [diol]/[6F-BPA] ratio increases, the T g of the copolymers decreases gradually from 185 to 87 °C and 94 °C, and the refractive index decreases from 1.5120( n TE )/1.5089( n TM ) to 1.4643( n TE )/1.4629( n TM ) and 1.4487( n TE )/1.4471( n TM ) for the copolymers from 6C F -diol and 7 b C F -diol, respectively. Meanwhile, the increase of the [diol]/[6F-BPA] ratio also effectively reduces the birefringence of the polymer films from 3.1 × 10 -3 to 1.4 × 10 -3 for the polymers from 6C F -diol and to 1.6 × 10 -3 for the polymers from 7 b C F -diol. Well-developed waveguide structures with smooth ridge walls from these polymers have also been demonstrated using a cost-effective soft lithography technique.
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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 | 0.002 |
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 it