Preparation and Characterization of Soluble Polyimide Based on a Novel Pyridine-containing Aromatic Diamine
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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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".