Lamellar polysilicate nanocomposite materials: Intercalation of polyethylene glycols into protonated magadiite
Bibliographic record
Abstract
This paper reports the direct intercalation of organic polymers into the interlamellar spaces of the layered polysilicate magadiite. Poly(ethylene glycols) (PEG 3400 and PEG 1000) were intercalated into acidified magadiite (H-magadiite) by displacing a dipolar aprotic solvent (e.g., dimethylsulfoxide (DMSO)) from the H-magadiite DMSO intercalate. This was done directly from the polymer melt at 155°C. The polysilicid acid (H-magadiite) was obtained by HCl titration of the sodic form of magadiite obtained by hydrothermal synthesis. Dipolar aprotic solvents (dimethylsulfoxide, N-methylformamide, and hexamethylphosphorictriamide) were intercalated in the interlamellar spaces of H-magadiite. PEG 3400 and PEG 1000 were then intercalated by dispersing the H-magadiite intercalates in a large excess of the polymers heated above their fusion temperature, without any solvent. The resulting polymer intercalated H-magadiite nanocomposites were isolated and purified and were shown by chemical analysis to have chemical formulae of H 2 Si 14 O 29 (-OCH 2 CH 2 -) 3.1 and H 2 Si 14 O 29 (-OCH 2 CH 2 -) 2.9 , respectively, in agreement with a structure in which one unit cell of magadiite corresponds to three oxyethylene units. The dipolar aprotic solvents have been completely removed from the interlamellar spaces. 13 C NMR dipolar diphasing techniques show that the polymer chains in the interlamellar spaces of H-magadiite are more constrained than in the bulk polymer. 29 Si NMR spectra show that the structure of magadiite is unchanged by the two processes of intercalation. The polymer intercalates are characterized by interlamellar spacings of 4.6 and 4.4 Å, as determined by XRD. These values correspond to a flattened arrangement of the polymer chains in the interlamellar spaces. This is also in agreement with DSC data, which demonstrate that the polymer chains are no longer in the aggregation state characteristic of the bulk polymer.Key words: lamellar polysilicates, polyethylene glycols, nanocomposite materials, polymer intercalation, magadiite.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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) | 0.003 | 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".