Preparation and Characterization of Soluble Polyimide Based on a Novel Pyridine-containing Aromatic Diamine
Why this work is in the frame
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Bibliographic record
Abstract
A novel pyridine-containing aromatic diamine monomer,4-phenyl-2,6-bis[4-(4-aminoph enoxy) phenyl]pyridine(ρ-PAPP)was successfully synthesized via nucleophilic substitution reaction,modified Chichibabin reaction,and catalytic reduction with hydrazine monohydrate,4-hydroxyacetophenone and benzaldehyde.Based on this,apyridine-containing polyimide was synthesized via conventional two-step method by usingρ-PAPP as a diamine monomer,2,2-bis[4-(3,4dicarboxyphenoxy)phenyl]propane dian- hydride as a dianhydride monomer in N,N-dimethylformamide(DMF).The structure and properties of the polymer were characterized by FTIR,DSC,TGA,XRD,solubility testing.There were characteristic peaks of polyimide around 1780、1723、1378cm-1 in the FTIR spectrum.The polyimide was soluble in common organic solvents.The polyimide had good thermal stability with glass transition temperature(Tg) of 191.2℃,the temperature at 10% weight loss was 473.8℃in nitrogen atmosphere and the residual mass at 800℃ was 43%.The other properties included tensile strengths of 98.5MPa,tensile modulus of 1.24GPa,and water uptake of 0.67%.
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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) | 0.000 | 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 it