Preparation of a new polypropylene/clay nanocomposites via in situ polymerization
Bibliographic record
Abstract
Abstract Novel polypropylene/clay nanocomposites were prepared by in situ polymerization method with TiCl 4 /MgCl 2 /organoclay/internal donor- AlEt 3 catalyst. The organo clay used is commercial Closite 15A that is an ammonium saltmodified montmorillonite (AMMT). For preparation of the catalyst, MgCl2 was deposited into the swollen AMMT layers and then TiCl4 and internal donor were loaded on the layer surfaces of AMMT. X-ray diffraction (XRD), transmission electron microscopy (TEM) and rheological measurements were used for characterization of the nanocomposites. The Linear and nonlinear melt-state viscoelastic properties of the polymer matrix and its nanocomposite are also investigated. In the presence of the clay lamellae, a pronounced increase in the low frequency moduli is observed. Transient rheological data reveal a stress overshoot for nanocomposite where there is no significant overshoot for polymer matrix. This stress overshoot can be attributed to the deformation and orientation of the special structure of clay platelets in polymer melts. Finally, experimental data are compared with the predictions of a mesoscopic rheological model.
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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".