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Showing 1 to 14 of 14 for “"novolac"”.
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Novel Novolac-Phthalonitrile and Siloxane-Phthalonitrile Resins cured with low melting Novolac Oligomers for Flame Retardant Structural Thermosets
The chemical modification of low molecular weight novolac oligomers and siloxane/silane-containing monomers has led to novel phthalonitrile derivatives with low glass transition temperatures, ranging from -25 to 75 ºC. Multi-functional, low molecular weight phenol-formaldehyde novolac resins were …
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Cresol Novolac/Epoxy Networks: Synthesis, Properties, and Processability
… have been prepared by the reaction of phenolic novolac resins with various diepoxides. The stoichiometric ratio can be adjusted to achieve networks with good mechanical properties while maintaining excellent flame retardance. A series of linear, controlled molecular weight, 2,6-dimethylphenol …
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Stabilization of Horseradish Peroxidase Using Epoxy Novolac Resins for Applications with Microfluidic Paper-Based Analytical Devices
<p>Microfluidic paper-based analytical devices (microPADs) are an emerging platform for point-of-care diagnostic tests for use by untrained users with potential applications in healthcare, environmental monitoring, and food safety. These devices can be developed for a multitude of different tests, …
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Wood liquefaction in the presence of phenol with a weak acid catalyst and its potential for novolac type wood adhesives
… done on liquefied wood, liquefied wood residues, novolac-type liquefied wood resins, and bio-composites fabricated from liquefied wood resin. The results of the liquefied wood residue characterization revealed that the liquefaction reactions conducted in different reaction vessels underwent …
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Void-Free Flame Retardant Phenolic Networks: Properties and Processability
… the common procedure for curing phenolic novolac resins uses hexamethylenetetramine (HMTA) and releases volatiles during the cure, which produce networks with numerous voids. This results in materials that lack the toughness necessary for structural applications. An alternative to curing …
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Multicomponent network and linear polymer systems: thermal and morphological characterization
… The network system consists of a phenolic novolac based epoxy cured in the presence of low molecular weight poly (propylene oxide). The resulting morphology of these polymers has been studied with the help of scanning electron microscopy.
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The Effect of Chemistry and Network Structure on Morphological and Mechanical Properties of Diepoxide Precursors and Poly(Hydroxyethers)
… based diepoxide oligomers using a siloxane or a novolac crosslinking agent. In the siloxane cured networks the incorporation of the phosphine oxide group yielded networks with increased glass transition temperatures, from 71°C to 92°C, and water absorption, from 1 wt % to 5.5 wt %, due to the …
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Novel resist materials for next generation lithography
… etch resistance comparable with a commercial novolac resist have been demonstrated. The second part presents the development of a chemically amplified positive-tone fullerene based resists with the advantage of aqueous base solution development. Their lithographic capability is evaluated and …
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Film formation on precious metal surfaces in the presence of epoxy resins
… to epoxy resin. Epoxy rods were prepared from novolac hardened by 4-4' methylenedianiline (MDA). The curing and post curing temperatures were 60, 125 °C and 125, 160 °C. The composition of the epoxies used were 27.0 and 31. 5 parts (MDA) per 100 parts epoxy. The metals investigated were pure …
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Synthesis of well-defined single and multiphase polymers using various living polymerization methods
… and a 33:1 etch ratio relative to a cross linked novolac resin. The 7000 g/mol methacryloyloxy functionalized PMMA macromonomers were copolymerized anionically with MMA to yield PMMA-g-PMMA polymers having absolute molar mass distributions less than 1.1 containing from 5 wt% to 40 wt% of the …
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High Performance Materials Containing Nitrile Groups
… A 700 g mol-1 novolac oligomer was cured with relatively low concentrations of this reagent (~20 wt %) into high Tg (~190 °C) networks. The curing reaction was attrubuted to nucleophilic attack of the phenolic hydroxyl on the nitrile groups of the phthalonitrile …
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The Chemistry of Dimethacrylate-Styrene Networks and Development of Flame Retardant, Halogen-Free Fiber Reinforced Vinyl Ester Composites
… investigated. A series of binders comprised of novolac, bisphenol A diphosphate, and montmorillonite clay were developed and dispersed into the vinyl ester matrix. Cone calorimetry showed reductions in the peak heat release rate comparable to the brominated resin.
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Correlation of physical and chemical properties of anhydride-cured epoxy resins with theoretical structure
… and chemical properties of a cured epoxidized novolac resin, and the final properties of a cured system can be predicted with reasonable accuracy from the theoretical structure. Properties were related to structure in terms of cyclic rings, unsaturation, substituted groups, etc. Measured …
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Thermisch härtende Polymerverbundmaterialien als Basis für neue Befestigungssysteme
Mit der Entwicklung und Einführung ökologischer Bauweise im Neubau sowie neuen Baustoffsystemen in Sandwichbauweise wird es zunehmend erforderlich, neue effektive Befestigungsvarianten zu entwickeln, die eine dauerhafte Fixierung auch unter sicherheitstechnischen Bestimmungen sowie aus Garantie- …