Application of silsesquioxanes for modification of epoxy resins

Abstract

Zastosowanie sferokrzemianów do modyfikacji ¿ywic epoksydowychStreszczenie -Na podstawie ma³ocz¹steczkowej ¿ywicy epoksydowej Epidian 6 (EP 6) wytwarzano kompozyty z udzia³em 0-10 % mas. oktakis [(3-glicydylopropylo)dimetylosiloksy]oktasilseskwioksanu (POSS_OG) i sieciowano je za pomoc¹ trietylenotetraminy (Z1). Dodatek POSS_OG do EP 6 zwiêksza³ p³ynnooeae ¿ywicy oraz zmniejsza³ egzotermicznooeae reakcji sieciowania kompozycji. Otrzymane kompozyty zawieraj¹ce 1-6 % mas. POSS_OG wykazywa³y znacznie wiêksz¹ (2-4 krotnie) udarnooeae ni¿ wyjoeciowa ¿ywica EP 6, a tak¿e wiêksz¹ odpornooeae na p³omieñ. Meto-d¹ mikrospektroskopii IR stwierdzono zwiêkszenie obszarów pasm charakterystycznych dla ugrupowañ O-Si-O w kompozycie z udzia³em 1 % mas. silseskwioksanu. S³owa kluczowe: silseskwioksan, ¿ywica epoksydowa, modyfikacja, sieciowanie, tiksotropia, wytrzyma³ooeae mechaniczna, palnooeae. APPLICATION OF SILSESQUIOXANES FOR MODIFICATION OF EPOXY RESINSSummary -Composites consisting of low-molecular weight epoxy resin Epidian 6 and 0-10 wt. % octakis [(3-glycidylpropyl)dimethylsiloxy]octasilsesquioxane (POSS_OG) cross-linked with triethylenetetramine (Z1) were prepared. The presence of POSS_OG in the composition improved its flow properties and reduced the heat evolved in exothermic cross-linking reaction. The resulting composites containing 1-6 wt. % POSS_OG had significantly increased (by 2-4 times) impact resistance and better flame resistance (increase of LOI by ~3.7 points) compared to the non-modified EP 6 resin. By using IR microspectroscopy mapping, an increase in the areas of the bands corresponding to O-Si-O groups was observed for the composites containing 1 wt. % silsesquioxane.

Polyurethane composites based on silsesquioxane derivatives of different structures

“…The covalent incorporation of reactive silsesquioxane monomers into polymers is the greatest advantage of the proposed fillers. The formation of covalent bonds between the polymer matrix and the filler permits obtaining inseparable hybrid material based on organic, functional polymers (e.g., epoxides, polyamides, methacrylates, or polyurethanes) [33][34][35][36].…”

Epoxy Resin Composite Based on Functional Hybrid Fillers

“…The study employed the procedure of modification of smectic clays using POSS, which has been previously patented [ 37 , 38 ] and described in the literature [ 34 , 35 , 36 ].…”

“…Our previous work on modified bentonite nanocomposites with a synthetic resin matrix [ 34 , 35 , 36 , 37 ] prompted us to undertake studies on the development of new epoxy composites with various fillers with different particle shapes. This provides a new way to combine POSS-modified bentonite (platelet shape) and POSS-modified silica (spherical shape), leading to functional hybrid composites.…”

Composites of commercial unsaturated polyester resins containing nanofillers Nanobent. Part II. Nanocomposites with domestic nanofillers applied in Vacuum Casting technology

“…Wspomniane w³aoeciwooeci mo¿na uzyskaae w przypadku odpowiednio zaprojektowanego nanokompozytu hybrydowego. Wytwarzanie prototypów kó³ zêbatych mo¿e byae realizowane z zastosowaniem takich specjalistycznych nanokompozytów oraz nowoczesnych metod szybkiego prototypowania [2][3][4][5][6][7]. Metody szybkiego prototypowania po-zwalaj¹ na wykonanie modeli fizycznych z okreoelon¹ do-k³adnooeci¹, zale¿n¹ od: przygotowania modelu 3D-CAD (ang.…”