Studies on Thermal, Mechanical and Morphological Behaviour of Caprolactam Blocked Methylenediphenyl Diisocyanate and Bismaleimide Modified Epoxy Matrices
Bibliographic record
Abstract
Diglycidyl ether of bisphenol A epoxy resin (DGEBA) was toughened with 5%, 10%and 15% (by wt) of caprolactamblocked methylenediphenyl diisocyanate (CMDI)using 4,4‘- diaminodiphenylmethane (DDM) as curing agent. Thetoughened epoxy resin was further modified with chemical modifier N, N‘-bismaleimido-4, 40-diphenylmethane(BMI).Caprolactam blocked methylenediphenyl diisocyanate was synthesized by the reaction of caprolactam withmethylenediphenyl diisocyanate in presence of carbon tetrachloride under nitrogen atmosphere. Thermal properties ofthe developed matrices were characterized by means of differential scanning calorimetry (DSC), thermo gravimetricanalysis (TGA), heat distortion temperature (HDT) and dynamic mechanical analysis (DMA). Mechanical propertieslike tensile strength, flexural strength and impact strength were tested as per ASTM standards. The glass transitiontemperature (Tg) and thermal stability were decreased with increase in the percentage incorporation of CMDI. Thethermomechanical properties of caprolactam blocked methylenediphenyl diisocyanate toughened epoxy resin wereincreased by increasing the percentage incorporation of bismaleimide. The values of impact strength for epoxy resinwere increased with increase in the percentage concentration of CMDI. The homogeneous morphology of CMDItoughened epoxy resin and bismaleimide modified CMDI toughened epoxy resin system was ascertained from scanningelectron microscope (SEM).
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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".