| Titre : |
Kinetics analysis and physical properties of photocured silicate-based thiol-ene nanocomposites : The effects of vinyl POSS ene on the polymerization kinetics and physical properties of thiol-triallyl ether networks |
| Type de document : |
texte imprimé |
| Auteurs : |
Tolecia S. Clark, Auteur ; Charles E. Hoyle, Auteur ; Sergei Nazarenko, Auteur |
| Année de publication : |
2008 |
| Article en page(s) : |
p. 345-351 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Matériaux hybrides
Photoréticulation
Silsesquioxanes oligomères polyhèdres
Stabilité thermique
Thiols
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
The kinetics and thermal/physical properties of the trithiol-TAE (triallyl ether) system were measured with respect to increasing polyoligomeric silsesquioxane (POSS) concentrations in order to understand how the presence of POSS nanoparticles affects network formation at low loadings. Vinyl POSS monomer (vPOSS-Bu4) with both vinyl and carboxylate pendant groups was synthesized via a thermally initiated, free-radical reaction to improve the compatibility of the inorganic particles with the trithiol and triallyl ether comomoners. Chemically modified vPOSS-Bu4 particles were incorporated into the trithiol-TAE polymer networks by a thiol-ene free-radical photopolymerization at molar concentrations of 0, 1, and 5 ene mol%. The polymerization rates were analyzed using real-time FTIR and photo-DSC. The polymerization rates showed no significant changes with increasing vPOSS-Bu4 concentration. Thermal analyses of the films by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) demonstrated that thermal stability improves without affecting T g as the POSS concentration increased. Additionally, scratch resistance increased and flame spread decreased markedly with increasing POSS concentration for concentrations up to 5 mol% vPOSS-Bu4. |
| DOI : |
10.1007/s11998-008-9092-x |
| En ligne : |
https://link.springer.com/content/pdf/10.1007%2Fs11998-008-9092-x.pdf |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2978 |
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 5, N° 3 (09/2008) . - p. 345-351
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Kinetics analysis and physical properties of photocured silicate-based thiol-ene nanocomposites : The effects of vinyl POSS ene on the polymerization kinetics and physical properties of thiol-triallyl ether networks in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 5, N° 3 (09/2008)
