Synthesis, XRD, XRF, TGA/DTG/DTA/DSC, thermal conductivity, SEM, AFM, TEM, EDS, FTIR and NMR spectral studies of calcium silicate hydrate-polymer nanocomposites
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Résumé
Thermal performance of materials is very important in many industries, ranging from pharmacy, battery and aerospace to the electronics and construction industries. Therefore, it is highly desired to use efficient and effective testing methods to measure the thermal properties of nanocomposites [1, 2]. Thermal properties, XRD, XRF, EDS, FTIR and NMR spectra, AFM, SEM and TEM results are very important parameters for characterization of materials ranging from gaseous through liquid to solid. Therefore, it is not surprising that many authors studied the thermal properties together with XRF, XRD, spectral and microscopic studies to characterize various materials [1-8].Nanocomposites are a new class of composites, that are particle-filled polymers for which at least one dimension of the dispersed particles is in the nanometer range. Calcium silicate hydrate (C-S-H)-and polymer based nanocomposites (C-S-HPN) have evoked intense research interests lately due to their unique characteristics and many commercial applications. Nanocomposites are reported to promote the thermal, mechanical, molecular barrier, flame retardant and corrosion protection properties based on the recently published results [1, 2].Various C-S-HPN were prepared by incorporating poly(vinyl alcohol) (PVA) and poly(acrylic acid) (PAA) into the inorganic layers of C-S-H during precipitation of quasicrystalline C-S-H from aqueous solution. The as synthesized C-S-HPN materials were characterized by EDS, FTIR and NMR spectroscopy, XRF, XRD, SEM, AFM, TEM, thermal conductivity, TGA, DTG, DTA and DSC. The XRD peaks of C-S-HPN suggest the intermediate organizations presenting both intercalation of PVA and PAA and exfoliation of C-S-H. The AFM micrographs of C-S-H, PVA, PAA and C-S-HPN with different PVA and PAA contents exhibit the significant differences in their morphologies. The effects of the material compositions on the thermal stability of various C-S-HPN along with PVA, PAA and C-S-H were studied by TGA, DTG, DTA and DSC. Three significant decomposition temperature ranges were observed on the TGA curves of all C-S-HPN. Thermal conductivity of PVA, C-S-H and C-S-HPN materials was studied in the temperature range 25-50 oC. The lowest thermal conductivity at 25 oC was observed for C-S-H; however, PVA exhibited the lowest thermal conductivity at 50 oC. C-S-HPN exhibited the highest thermal conductivity in both cases. However, the highest thermal conductivity increase was observed for C-S-H. The thermal conductivity from 25-50 oC increases are 7.03, 17.46 and 14.85 % for PVA, C-S-H and C-S-HPN materials, respectively.
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Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,001 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,001 | 0,001 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découle