What happens when phenol reacts with formaldehyde?
One reacts phenol and formaldehyde directly to produce a thermosetting network polymer, while the other restricts the formaldehyde to produce a prepolymer known as novolac which can be moulded and then cured with the addition of more formaldehyde and heat.
What is phenol-formaldehyde resin called?
Phenolic resins are also widely known as phenol–formaldehyde resins, PF resins and phenoplasts. The trade name Bakelite has in the past been widely and erroneously used as a common noun and indeed is noted as such in many English dictionaries.
What is phenol-formaldehyde resin explain its formation using chemical reaction?
phenol-formaldehyde resin, also called phenolic resin, any of a number of synthetic resins made by reacting phenol (an aromatic alcohol derived from benzene) with formaldehyde (a reactive gas derived from methane). Phenol-formaldehyde resins were the first completely synthetic polymers to be commercialized.
What is phenol-formaldehyde resin used for?
Phenol Formaldehyde Resin Applications Phenolic resins are primarily used for making circuit boards like PCB. Further, we find the applications of phenolic resins in Electrical equipment.
Is phenol formaldehyde resin condensation polymer?
Phenol and formaldehyde undergo condensation to give a polymer (A) which on heating with formaldehyde gives a thermosetting polymer (B).
What is Bakelite in chemistry?
A hard, infusible, and chemically resistant plastic, Bakelite was based on a chemical combination of phenol and formaldehyde (phenol-formaldehyde resin), two compounds that were derived from coal tar and wood alcohol (methanol), respectively, at that time.
What are two stage resins?
The resins having the curing agent incorporated cure or “thermoset” to the desired degree when processed by the customer. Because an additional agent is required to complete the resin’s cure, the industry commonly refers to novolac resins as “two-stage” or “two-step” products.
How is phenol-formaldehyde produced?
Phenol formaldehyde (PF) resin is a polymer condensate obtained from the condensation reaction between phenol and formaldehyde in the presence of an alkaline catalyst [1-7]. PF resin is usually synthesized with formaldehyde (liquid formalin) instead of paraformaldehyde (powder) [2, 7, 8-12].
What are the properties of phenol formaldehyde?
Properties of Phenolic Resins In addition, phenol formaldehyde resin properties include good thermal insulation, low density and excellent durability. They are easy to mold into a variety of shapes and complex contours, making them adaptable to custom equipment or environments.
How Bakelite is formed from phenol and formaldehyde?
Bakelite is formed from the reaction of phenol and formaldehyde. Basically it is formed in two steps. In the first step formaldehyde reacts with phenol and produces o-Hydroxymethyl phenol. Then o-Hydroxy methyl phenol and phenol come together and form Bakelite.
What is Bakelite resin?
How is phenol formaldehyde produced?
What is the reagent is used in the preparation of urea formaldehyde resin?
In industrial production, urea resins are made by the condensation of formaldehyde and urea in an aqueous solution, using ammonia as an alkaline catalyst.