Mumbai University > First Year Engineering > Sem1 > Applied Chemistry 1

Marks: 5M

Year: May 2015

These are obtained by condensation polymerization using phenol or its derivatives. Other name of this polymer is Bakelite.

Bakelite is a thermosetting resin prepared from condensing phenol with formaldehyde in presence of acidic/alkaline catalyst.

The reaction takes place in three steps

1) Preparation of O, O, P-tri methyl phenol resin

2) Polymerization of O-methylol phenol to give Novolac with linear structure

3) Heating Novolac to form highly ross- linked polymer Bakelite

Properties and uses:

• Scratch proof and water resistant.

• It is not attacked by non- oxidizing acid and salts.

• Insoluble in many solvents.

• Excellent insulating properties against electric current/ voltage.

• It is used in electric insulator part e.g. Switches, plugs, switch and component mounting boards, printed circuit boards, heater handles. In paints and varnishes.