Synthesis and Properties of Bis(3,5-dimethyl-4-amino phenyl)-4′-methoxy phenyl Methane Based Polymerization of Monomeric Reactants Type Polyimide and Its Composites
Bibliographic record
Abstract
Polymerization of Monomeric Reactants (PMR) type of polyimide was prepared using bis(3,5-dimethyl-4-amino phenyl)-4′-methoxy phenyl methane and characterized by elemental analysis, FT-IR, 1 H NMR, and 13 C NMR spectral techniques. Differential scanning calorimetry (DSC) analysis shows that melting and curing take place in the temperature range of 215 to 230 °C and 265 to 315 °C respectively. The uncured and cured prepolymer undergo two step (335 and 583 °C) and single step (537 °C) decomposition respectively. The T 10% and char yield at 800 °C were found to be 465 °C and 46 wt %, respectively. FT-IR and thermogravimetric analysis (TGA) of the heat treated resin powder and prepolymer reveal that imidization takes place in the temperature range 250–275 °C and cross-linking occurs between 275 and 325 °C. The prepolymer was found to undergo photocross-linking. The flexural strength, flexural modulus, and interlaminar shear strength of carbon fiber (T300) reinforced BA4MPM-PMR type composite are 447 MPa, 34 GPa, and 42 MPa, respectively.
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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".