Hybrid organic/inorganic coatings produced using a dual-cure mechanism / Jie He in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 9, N° 4 (07/2012)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 9, N° 4 (07/2012) . - p. 423-431 Titre : Hybrid organic/inorganic coatings produced using a dual-cure mechanism Type de document : texte imprimé Auteurs : Jie He, Auteur ; Bret J. Chisholm, Auteur ; Bret A. Mayo, Auteur ; Hanzhen Bao, Auteur ; Jared Risan, Auteur ; David A. Christianson, Auteur ; Crystal L. Rafferty, Auteur Année de publication : 2012 Article en page(s) : p. 423-431 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosion Matériaux hybrides Polyacrylates Réticulation (polymérisation) Revêtements -- Entretien et réparations Revêtements -- Séchage sous rayonnement ultraviolet Silicones Les 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). Sol-gel, Procédé Tags : Revêtements  hybrides  organiques  /  inorganiques  -  séchage  UV  revêtements  mécanisme  de  guérison  double  Sol-gel Index. décimale : 667.9 Revêtements et enduits Résumé : A coating precursor containing both acrylate functionality and trimethoxysilane functionality was produced by reacting bisphenol-A glycerolate diacrylate with 3-isocyanatopropyltimethoxysilane. With this precursor, two different crosslinked networks can be produced. A polyacrylate network can be produced using a radiation-cure mechanism while a polysiloxane network can be produced by hydrolysis and condensation reactions involving the trimethoxysilane groups. The objective of the study was to determine the utility of this dual-cure system for generating rapid-cure coatings for corrosion protection. Coating properties were determined as a function of cure conditions. The results of the study showed that the formation of siloxane crosslinks was significantly hindered by the crosslinked network induced by the UV-curing process. Even though the overall conversion of trimethoxysilane groups to siloxane crosslinks was relatively low, coating barrier properties were significantly enhanced and coating free volume reduced. At ambient conditions, additional crosslinking occurring through siloxane bond formation increased within the first 4 days after UV-curing. Beyond this period, siloxane bond formation remained unchanged as did coating properties. Note de contenu : - Materials - Coating preparation and processing - Instrumentation DOI : 10.1007/s11998-011-9389-z En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-011-9389-z.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15993 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
14189	-	Périodique	Bibliothèque principale	Documentaires	Disponible

The utilization of specific interactions to enhance the mechanical properties of polysiloxane coatings / Partha Majumdar in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 7, N° 2 (03/2010)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 7, N° 2 (03/2010) . - p. 239-252 Titre : The utilization of specific interactions to enhance the mechanical properties of polysiloxane coatings Type de document : texte imprimé Auteurs : Partha Majumdar, Auteur ; Bret A. Mayo, Auteur ; Jongsoo Kim, Auteur ; Christy Gallagher-Lein, Auteur ; Elizabeth Lee, Auteur ; Nathan Gubbins, Auteur ; Bret J. Chisholm, Auteur Année de publication : 2010 Article en page(s) : p. 239-252 Note générale : Bibliogr. Langues : Américain (ame) Tags : 'Revêtements  polysiloxanes'  'Sels  ammonium  quaternaire''Nanoparticules  silice'  'Propriétés  mécaniques'  'Spectroscopie  annihilation  positron' Index. décimale : 667.9 Revêtements et enduits Résumé : Moisture-curable polysiloxanes were modified with ionic groups to enable specific interactions between the polysiloxane matrix and silica nanoparticle reinforcement. A trimethoxysilane-functional quaternary ammonium salt (QAS) was used to modify the polysiloxane matrix. A comparison of the mechanical properties of coatings containing QAS modification to analogous coatings without QAS modification showed that QAS modification resulted in a dramatic improvement in mechanical properties of silica nanoparticle-reinforced coatings. QAS modification provided major enhancements in both tensile modulus and toughness. The coatings were characterized using positron annihilation spectroscopy, photo-acoustic FT-IR, differential scanning calorimetry, transmission electron microscope, and atomic force microscopy. The characterization results suggested that the QAS moieties present in the polysiloxane matrix undergo specific interactions with the surface of silica nanoparticles enabling an enhancement in interfacial adhesion between the polymer matrix and the nanoparticles. Most likely, the specific interaction that provided the enhanced mechanical properties was an ion–dipole interaction involving silanol groups present on the surface of the silica nanoparticles. The enhanced modulus and toughness of these polysiloxane materials may enable their application as a fouling-release coating for ship hulls, since current polysiloxane-based fouling release coatings suffer from poor mechanical properties and durability. DOI : 10.1007/s11998-009-9177-1 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-009-9177-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9070 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
012083	-	Périodique	Bibliothèque principale	Documentaires	Disponible

---

1 (1 - 2 / 2)