[article]
| Titre : |
Facile preparation of fluoroalkyl end-capped vinyltrimethoxysilane oligomer/a, w-dihydroxy-terminated poly(dimethylsiloxane) composite rubber : application to effective removal of fluorinated aromatic compound from aqueous methanol solution by fluoroalkylated silicone composite rubber |
| Type de document : |
texte imprimé |
| Auteurs : |
Katsumi Yamashita, Auteur ; Taiga Yokouchi, Auteur ; Hideo Sawada, Auteur |
| Année de publication : |
2021 |
| Article en page(s) : |
p. 63-73 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Adsorption
Caoutchouc
Composés aromatiques
Composites polymères
Fluoropolymères
Oligomères
Polyalkoxysiloxane
PolydiméthylsiloxaneLe polydiméthylsiloxane —[O-Si(CH3)2]n—, ou poly(diméthylsiloxane) selon la nomenclature systématique, communément appelé PDMS ou diméthicone, est un polymère organominéral de la famille des siloxanes souvent présent dans les shampoings. On l'y ajoute pour augmenter le volume des cheveux mais il peut également aller boucher les pores du cuir chevelu et rendre les cheveux gras. C'est une des raisons pour lesquelles se laver les cheveux tous les jours est très déconseillé avec un shampooing contenant des silicones.
Il existe également de l'amodiméthicone, qui est un dérivé du diméthicone.
Le polydiméthylsiloxane est un additif alimentaire (E900), utilisé comme antimoussant dans les boissons (Coca-Cola BlāK).
La chaîne de poly(diméthylsiloxane) forme également la structure de base des huiles et des caoutchoucs silicones.
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Fluoroalkyl end-capped vinyltrimethoxysilane oligomer [RF-(CH2CHSiOMe)3)n-RF ; n = 2, 3; RF = CF(CF3)OC3F7 : RF-(VM)n-RF] undergoes the sol-gel reactions in the presence of α, ω-dihydroxy-terminated poly(dimethylsiloxane) [HO-(SiMe2O)nH : HPDMS] under non-catalytic conditions to provide the crosslinked RF-(VM)n-RF/HPDMS composite rubber in quantitative isolated yields. Especially, we can isolate the expected composite rubber through the sol-gel reactions, in which the contents of the RF-(VM)n-RF oligomer based on employed oligomer and HPDMS are greater than 0.16 %. In contrast, traditional silane coupling agents such as tetraethoxysilane, methyltrimethoxysilane and triethoxy-1H, 1H, 2H, 2H-tridecafluoro-n-octylsilane were unable to afford the expected composite rubber through the sol-gel reactions with HPDMS under similar conditions. The fluoroalkylated silicone composite rubber thus obtained gave no swelling behavior toward water, dimethyl sulfoxide and methanol ; however, the composite rubber was found to display the higher swelling characteristic for toluene, hexane and tetrahydrofuran, especially for fluorinated aliphatic solvents. Interestingly, it was demonstrated that the fluoroalkylated silicone composite rubber swollen with hexane can adsorb a variety of aromatic compounds in aqueous methanol solutions. More interestingly, we found that the fluoroalkylated silicone composite rubber can exhibit an excellent adsorption ability toward the fluorinated aromatic compounds such as 2', 3', 4', 5', 6'-pentafluoroacetophenone, compared to that of the corresponding non-fluorinated one. |
| Note de contenu : |
- EXPERIMENTAL : Measurements - Materials - Preparation of fluoroalkyl end-caped vinyltrimethoxisylane oligomer/α, ω-dihydroxy-terminated poly(dimethylsiloxane) composite [Rf-(VM)n-Rf/HPDMS] rubber - Preparation of modified glass treated with the Rf-(VM)n-Rf/HPDMS composite rubber - Evaluation of swelling behavior of the fluoroaklylated silicone composite rubber soaked in a variety of solvents - Adsorption of aromatic compound in aqueous methanol solution by the Rf-(VM)n-Rf/HPDMS |
| DOI : |
https://doi.org/10.1007/s11998-020-00382-8 |
| En ligne : |
https://link.springer.com/content/pdf/10.1007/s11998-020-00382-9-8.pdf |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35351 |
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 1 (01/2021) . - p. 63-73
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