Studies on Phenol-Formaldehyde Resins X. Relation between the Increases in Viscosity and Density of the Phenol-Formaldehyde-System
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چکیده
منابع مشابه
Wetting Behaviors of Phenol- and Urea-formaldehyde Resins as Compatibilizers
Understanding wetting behavior and surface coverage of resins on a wood surface is important to obtain satisfactory adhesion and optimize adhesive application for wood composite manufacturing. Sessile and micro-droplets of ureaand phenol-formaldehyde (UF and PF) resins were generated on wood surfaces to observe wetting behaviors using three directional image generation system and atomic force m...
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Wood liquefaction was conducted at a 2/1 phenol/wood ratio in two different reactors: (1) an atmospheric three-necked flask reactor and (2) a sealed Parr reactor. The liquefied wood mixture (liquefied wood, unreacted phenol, and wood residue) was further condensed with formaldehyde under acidic conditions to synthesize two novolac-type liquefied wood/phenol/formaldehyde (LWPF) resins: LWPF1 (th...
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Humins are low-value-added byproducts from the biomass acid hydrolysis process. In the present work, humins were first employed as a phenol replacement for synthesis of modified phenol-formaldehyde adhesives through a two-step process. In this process, humins were first utilized to obtain alkaline soluble products, mainly consisting of phenolics, through a hydrothermal process. The obtained alk...
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Determination by thermomechanical analysis (TMA) of the average number of degrees of freedom of polymer segments between crosslinking nodes of phenolformaldehyde (PF) resin-hardened networks indicate that additive-accelerated PF resin polycondensations and hardening presented several different acceleration mechanisms. Some additives such as sodium carbonate appear to present purely an accelerat...
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Phenol-formaldehyde/silica hybrid gel with hydrophobic character, high porosity, and thesmall pore size mean was prepared via sol-gel polymerization under solvent saturated vaporatmosphere and was dried by ambient drying method. The silica sols were prepared based onTetraethoxysilane (TEOS) and Methyltrimethoxysilane (MTES) as hydrophilic and hydrophobicprecursors, respectively. Phenol-formalde...
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ژورنال
عنوان ژورنال: The Journal of the Society of Chemical Industry, Japan
سال: 1941
ISSN: 0023-2734,2185-0860
DOI: 10.1246/nikkashi1898.44.4_299