Thermal and Surface Properties of Phenolic Nanocomposites Containing Octaphenol Polyhedral Oligomeric Silsesquioxane

Abstract

We have synthesized a new polyhedral oligomeric silsesquioxane (POSS) containing eight phenol functional groups and copolymerized it with phenol and formaldehyde to form novolac-type phenolic/POSS nanocomposites exhibiting high thermal stabilities and low surface energies. Our DSC results indicate that the glass transition temperature of these nanocomposites increased initially upon increasing their POSS content, but then decreased at POSS content above 10 wt.-%, presumably because of the formation of relatively low molecular weight species and POSS aggregation as evidenced from MALDI-TOF mass analyses. Our TGA analyses indicated that the 5-wt.-%-mass-loss temperatures (T d ) increased significantly upon increasing the POSS content because the incorporation of the POSS led to the formation of an inorganic protection layer on the nanocomposite's surface. XPS and contact angle data provided positive evidence to back up this hypothesis. In addition, contact angle measurements indicated a significant enhancement in surface hydrophobicity after increasing the POSS content.Syntheses procedures of phenolic/OP-POSS nanocomposites.

Supramolecular Micellization of Diblock Copolymer Mixtures Mediated by Hydrogen Bonding for the Observation of Separated Coil and Chain Aggregation in Common Solvents

“…[1][2][3][4] It has been demonstrated that poly(4-vinyl pyridine) (P4VP) is able to interact strongly with polymers of a wide variety of structures through hydrogen bonding, such as poly(vinyl phenol) (PVPh), [5][6][7][8] poly(vinyl alcohol), [9] and phenolic resin. [10] It is well known that the nature of the solvent medium can control complex formation.…”

Synthesis and Characterization of Hybrid Poly(phenylenemethylene) Having Functionalized Silsesquioxanes (POSS)

“…Novolac-type phenolic/POSS nanocomposites with high thermal stabilities and low surface energies were prepared by POSS containing eight phenol functional groups, phenol, and formaldehyde. 14 Here, we report a new hybrid PPM presenting POSS units in their side chains. We incorporated the POSS units into PPM to improve its thermal stability and a uniform distribution of polymer particles.…”

Synthesis of a Nanostructured Composite: Octakis(1-propyl-1H-1,2,3-triazole-4-yl(methyl 2-chlorobenzoate))octasilsesquioxane via Click Reaction

“…14,15 Organic groups are introduced into the molecule either directly, during the synthesis or by a transformation of existing groups. 16 Over the last years, researchers have made a library of functionalized POSS compounds such as octaphenols, 17 octaisocyanates, 18 oligoethylene oxides, 19 and liquid crystalline materials.…”