The condensation products of phenol and formaldehyde can be either potentially thermosetting and known as Resols or thermoplastic and known as Novolaks. Resol is a type of product that is formed when formaldehyde used in molar excess under alkaline condition. By reacting with sufficient additional formaldehyde under alkaline conditions, it is possible to convert a novolak to a resol. The two resol prepared in this way differ in certain physical properties, such as intrinsic viscosity, from a resol made by direct reaction of phenol and formaldehyde under alkaline conditions.
Popular Posts
-
Epoxyalkyl Ester Adhesives Glycidyl compounds can be made by the reaction of epichlorohydrin with a substance other than an amino or hyd...
-
Melamine Formaldehyde Adhesive or Melamine Resin Adhesive A melamine formaldehyde adhesive (also commonly called a melamine glue or an MF)... -
There are hundreds of adhesive preparations on the market today, supplemented by hundreds of available formulations, which are capable of h...
-
The curing agents for urea formaldehyde resin , also called hardeners, accelerators, or catalysts, that are added to the resin by the user, ...
-
Water Toleration of Urea Formaldehyde Adhesive The methylol urea compounds referred to earlier are truly, if only slightly water soluble, ...
No comments:
Post a Comment