[article]
| Titre : |
Trialkoxylane grafting onto nanoparticles for the preparation of clear coat polyacrylate systems with excellent scratch performance |
| Type de document : |
texte imprimé |
| Auteurs : |
Tushar Bhosle, Auteur |
| Année de publication : |
2010 |
| Article en page(s) : |
p. 57-64 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Matériaux hybrides
Nanoparticules
Polyacrylates
Résistance à l'abrasion
Silanes
SiliconesLes silicones, ou polysiloxanes, sont des composés inorganiques formés d'une chaine silicium-oxygène (...-Si-O-Si-O-Si-O-...) sur laquelle des groupes se fixent, sur les atomes de silicium. Certains groupes organiques peuvent être utilisés pour relier entre elles plusieurs de ces chaines (...-Si-O-...). Le type le plus courant est le poly(diméthylsiloxane) linéaire ou PDMS. Le second groupe en importance de matériaux en silicone est celui des résines de silicone, formées par des oligosiloxanes ramifiés ou en forme de cage (wiki).
Vernis
|
| Tags : |
'Revêtement résistant aux rayures' 'Polyacrylate nanocomposites' Méthacryloxypropyltriméthoxysilane MEMO PTMO VTMO Nanocomposites Polysiloxanes Trialkoxysilane |
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Transparent reinforced polyacrylates were prepared using nanosized filer particles with radiation-curable acrylates. To improve embedding of the nanofillers within the acrylate matrix the filler surface was chemically modified. This modification of the silica and alumina nanoparticles was accomplished by trimethoxylanes having methacryloxypropyl (MEMO), vinyl (VTMO), and n-propyl (PTMO) functionalities. Due to acid catalyzed condensation of organosilanes a polysiloxane shell was formed around the nanoparticles. This shell is bonded to OH groups on the filler surface. The appearance of covalent Si-O-Si-R bonds was clearly shown by multinuclear MAS NMR. MALDI-TOF mass spectroscopy revealed the formation of polysiloxane oligomers with different degrees of condensation. In the work presented, an acrylate-nanocomposite formulation contains up to 35 wt.% nanosized silica covered with polysiloxanes. For MEMO modification, surface-anchored methacryl gropus can copolymerize with network acryaltes. But also PTMO-modified composite materials exhibit markedly improved improved properties as compared to the neat acrylate polymer ; e.g., an increased modulus and heat resistance, improved scratch and abrasion resistance. This makes polyacrylate nanocomposites a very promising new coating technology for many far reaching technical applications. |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9841 |
in PAINTINDIA > Vol. LX, N° 7 (07/2010) . - p. 57-64
[article]
|
Aller sur edunet
Accueil
Ajouter le résultat dans votre panier Affiner la rechercheTrialkoxylane grafting onto nanoparticles for the preparation of clear coat polyacrylate systems with excellent scratch performance / Tushar Bhosle in PAINTINDIA, Vol. LX, N° 7 (07/2010)
