What is Bakelite and how it is prepared?
Bakelite is a polymer made up of the monomers phenol and formaldehyde. Bakelite is the commercial name for the polymer obtained by the polymerization of phenol and formaldehyde. These are one of the oldest polymers that were synthesized by man. Phenol is made to react with formaldehyde.
Which chemical is used for preparation of Bakelite?
Bakelite, which is also known as a ‘material of a thousand uses’ is chemically called polyoxybenzyl methylene glycol anhydride. It is a thermosetting phenol-formaldehyde resin formed by the condensation reaction of phenol with formaldehyde.
How is Bakelite 12 prepared?
Phenol-Formaldehyde Polymers(Bakelite and related polymers):-they are obtained by condensation of phenol with formaldehyde in presence of either an acid or abase catalyst the initial product is Navolac which is points. Melamine Copolymer is widely used for making non breakable plastic crockery.
What is Bakelite reaction?
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 property makes Bakelite so hard?
Bakelite is hard and has high melting point.
What property makes bakelite so hard?
Is Bakelite worth money?
No matter what type of piece you have, genuine Bakelite jewelry is worth money. Many simple necklaces and bracelets sell for $100 or less, but more elaborate designs with multiple colors or intricate carving can sell for hundreds or even thousands of dollars.
Why did they stop using Bakelite?
Bakelite applications in conservation were discontinued in the 1940s because of certain disadvantages that soon became apparent. The lack of records and relevant information precludes any assumption on the extent of its use and in which institutions.
What are the steps in the preparation of Bakelite?
The preparation of bakelite involves several steps, as illustrated below. Initial methods of preparing bakelite involved the heating of formaldehyde and phenol in the presence of one of the following catalysts -zinc chloride (ZnCl 2 ), hydrochloric acid (HCl), or ammonia (NH 3 ).
How is Bakelite prepared as a condensation polymer?
So, we can, in general, say that Bakelite is a condensation polymer or a phenolic resin. Before we move on to the preparation of Bakelite, it is important to know how a polymer is prepared. Polymers are formed by combining ‘monomer’ or single units using a range of reaction mechanisms.
How to describe the structure of Bakelite monomers?
Bakelite: Structure and Uses 1 Preparation of Bakelite. When the phenol is taken in excess and the reaction medium is made acidic, the product of the condensation reaction obtained is acidic. 2 Bakelite Structure. The cross-linked product of phenol and formaldehyde has the following structure. 3 Uses of Bakelite.
When was bakelite invented and what are its uses?
Bakelite was invented in the early twentieth century but it is an important topic of study even in this 21st century. The properties of Bakelite are studied to get information regarding its commercial usage. The physical, chemical, electrical and thermal properties of Bakelite make it a widely used commercial polymers.