Superhydrophobic and breathable resorcinol-formaldehyde Xerogels

Carbonisation of Resorcinol-Formaldehyde Organic Xerogels: Effect of Temperature, Particle Size and Heating Rate on the Porosity of Carbon Xerogels

Resorcinol-Formaldehyde organic xerogels with an initial pH of 6.5 were synthesized in a microwave oven and then carbonised in a furnace. The influence of the carbonisation temperature, heating rate and the particle size of the organic xerogels upon the pore structure of the carbon xerogels was assessed. The textural properties of the organic and carbon xerogels were evaluated from N2 adsorptio...

Resorcinol-Formaldehyde (R-F) Resin

Resorcinol-formaldehyde resin "Russian Red" endodontic therapy.

Resorcinol-formaldehyde resin is a material used in endodontic therapy in many foreign countries. With immigration to the United States increasing, American dentists need to become familiar with resorcinol-formaldehyde therapy. It contains two potentially toxic components, formaldehyde (liquid) and resorcinol (powder). Zinc oxide or barium sulfate may be used for radiopacity. When 10% sodium hy...

Synthesis, Characterization and Composites from Resorcinol-urea-formaldehyde-casein Resin

condensation reaction of urea, casein and formaldehyde in the presence of varying proportion of resorcinol under alkaline condition. All the prepared resins were characterized by free-formaldehyde content, free-phenol content, viscosity measurements and infrared spectroscopy (IR). The resin samples were cured isothermally at 120oC using two different curing agents, p-toluene sulphonic acid (PTS...

Waterborne Colloidal Polymer/Silica Hybrid Dispersions and Their Assembly into Mesoporous Poly(melamine-formaldehyde) Xerogels.

The acid-catalyzed polycondensation of oligo(melamine-formaldehyde) in aqueous phase and in the presence of silica nanoparticles leads to a stable dispersion of coexisting silica and polymer nanoparticles. The dispersion can be processed into mesoporous xerogels (SBET ≈ 200 m(2) g(-1)), whose porosity can be enhanced by etching of silica up to specific surface areas of >400 m(2) g(-1). The form...