Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 16 of 16 for “"Resorcinol-formaldehyde"”.
-
Resorcinol-formaldehyde/titania (RFTi) gel composites for wastewater treatment
… from a sol-gel process via polycondensation of resorcinol-formaldehyde (RF), yielding unique properties that are ideal for use as an adsorbent for water treatment. TiO2 was successfully incorporated into the RF matrix during the polycondensation reaction of RF, to produce a chemically …
-
Development of nitrogen doped resorcinol-formaldehyde gels for carbon capture
Resorcinol-Formaldehyde (RF) xerogels are organic materials that have been widely studied due to their industrially relevant characteristics, such as high surface areas, suitable pore size and pore volume on which target species can be adsorbed; additionally, RF gels have significant potential to …
-
Electronic transport and photoconductive properties of resorcinol-formaldehyde-based carbon aerogels
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1995.
-
Nanostructured carbon-based materials for electrochemical applications
… to 1000 cm2/g) were obtained by carbonization of resorcinol formaldehyde (RF) polymer gels; using poly-diallyl methylammonium chloride and SiO2 (~200 nm diameter) as soft- and hard-template, respectively, to tailor the textural properties of the carbon products. Accelerated ageing tests on …
-
Investigating Differences in Douglas-fir and Southern Yellow Pine Bonding Properties
… (PU), and a two-part ambient curing phenol-resorcinol-formaldehyde (PRF). Shear stress for southern yellow pine was affected the most by the type of growth regions at the bond (juvenile to mature wood) and the assembly times of the adhesives used. Douglas-fir shear stress was affected by the …
-
Development and evaluation of glass fiber-reinforced composite/wood railroad crossties
… crossties.;Five primer/resin combinations (Resorcinol Formaldehyde group) were screened for strength and durability of treated wood crossties. To evaluate stiffness and durability of wrapped samples under natural environmental conditions (simulated by six cycles aging), half scale wooden …
-
A tour-de-force in polymer crosslinked aerogels
… with vastly improved mechanical properties. Resorcinol formaldehyde (RF) aerogels are pursued as precursors of carbon aerogels, which are electrically conducting. We have developed a HCl-catalyzed gelation process in CH₃CN, which is completed in ~ 2 h at room temperature as opposed to the …
-
Structure and performance of carbon xerogel molded emitters for micropropulsion applications
… carbon substrate. Finally, an array of resorcinol formaldehyde emitters is molded on top of a carbon substrate. The carbon xerogel substrate with a molded tip is tested for Retarding Potential Analysis and Time of Flight Mass Spectrometry measurements in order to determine fragmentation …
-
One pot synthesis of metal, carbides and polymeric aerogels
… are produced by pyrolysis of purely organic resorcinol-formaldehyde (RF) aerogels. Here we have developed interpenetrating networks of RF and metal oxide (MOx) aerogels that upon pyrolysis undergo smelting yielding metal, or carbide aerogels, depending on the chemical identity of M: oxides of …
-
Freeze-Casting For Facile Synthesis Of Novel Porous Materials
… impact of carbon precursor (glucose, sucrose, resorcinol, and resorcinol formaldehyde), SiO2 template, and freeze-casting conditions on the morphology and structural order was examined. Interestingly, the dispersion composition impacted the porosity generated by both the ice template and SiO2 …
-
Characterization of Mixed-Mode Fracture Testing of Adhesively Bonded Wood Specimens
… a moisture-cure polyurethane (PU) and a phenol/resorcinol/-formaldehyde (PRF) resin. The geometry tested in the study was the double cantilever beam that, in a dual-actuator load frame, can be used for testing different levels of mode-mixity. The mixed-mode loading condition is obtained by …
-
Co-Assembly Of Nanostructured Hybrid Materials For Energy Applications
… hybrid thin films of PI-b-PS-b-PEO mixed with resorcinol-formaldehyde resol oligomers were heated by the CO2 laser on sub-millisecond time scales, inducing PI-b-PS-b-PEO decomposition and resol thermopolymerization, to form hierarchical porous resin polymer structures with 3D connectivity, high …
-
THE NATURE OF BOND FORMATION AND FAILURE IN WOOD-ADHESIVE SYSTEMS
… between polycondensate wood adhesives (urea-formaldehyde (UF), melamine formaldehyde (MF), and phenol-resorcinol-formaldehyde (PRF)) and wood (spruce and scots pine) in an attempt to identify bonding and failure characteristics and forces. A number of techniques were used, including …
-
The effect of the catalyst on the formation of RF xerogels
The ability to alter the nanostructure of resorcinol formaldehyde (RF) gels by varying the synthesis conditions, along with the obtainable properties, makes them valuable for a number of applications. Consequently, optimising the synthesis process is important to produce high quality gels that …
-
Engineering ionic liquid ion sources for ion beam applications
… the PIR. In this thesis, porous carbon based on resorcinol-formaldehyde xerogels is introduced as an emitter substrate. The target pore sizes and emitter geometries to attain the PIR are obtained through analytical estimates. The carbon xerogel can be shaped to the required micron-sized geometry …
-
Mode-I Fracture in Bonded Wood: Studies of Adhesive Thermal Stability, and of the Effects of Wood Surface Deactivation
… the thermal stability of polyurethane (PUR) and resorcinol-formaldehyde (RF) wood adhesives. Bonded specimens for both adhesives were subjected to prolonged thermal exposure, and fracture testing was subsequently conducted after re-equilibration to standard test conditions. It was found that both …