Polymers EMonomers Polymerisation Degree of Polymerisation Different type of polymerisatio n reaction Char, of Polymers Uses Classification of Plastics Thermoplastic Materials Thermosetting Plastic Materials
Hello! Shankar Kumar B.Tech -Electronics&Telecommunication Cleared 2017 ESE written & Two times GATE Qualified. 4 Years of teaching experience
2 Thermosetting plastic Materials Phenol Formaldehyde (PF) or Bakelite Polyester / Melamine/ Nylon 0:
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1. Phenol Formaldehyde (PF) or Bakelite It is made by condensation polymerisation of phenol & formaldehyde. OH catalyst + HCheat Formaldehyde Phenol Bakelite Bakelite is strong, rigid and dimensionally stable. It is resistant to heat, chemical and solvents. It is used for making : (i) electrical parts (ii) paints and adhesives (i) thermal insulators (iv) lavoratory seats
2. Polyester It is made by condensation polymerisation of dicarboxylic acid and dihydric alcohol Polyesters have good resistance to heat & chemicals. They are used for (i) components of automobiles, helmets & paints. (i) borders for glass fibres. (iii) jointing and repair work 0
3. Melamine O It is obtained by condensation of urea (melamine) with formaldehyde. - CH2-N - CH2- HN Polymerisation Melamine has high resistance to chemicals, heat & moisture. It is also hard and scratch free. It has good electrical properties. They are used for : () surface coating & paints. (ii) crockery items. (iii) doors & plugs, switches & buttons.
A. Nylon It is an example of condensation polymerisation . It is produced by step growth polymerisation . Nylons are made from adipic acid and diamine NH O adipic acid hexanediamine nylon-66
Phenol and formaldehyde are polymerized to a resultant product known as (a) PVC (c) Polyester (b) Bakelite (d) Teflon [ESE 2017] Ans. (b) CO(2) Formaldehyde Phenol +Water Phenol formaldehyde (Bakelite)
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B.TECH | ELECTRONICS & TELECOMMUNICATION | ESE WRITTEN QUALIFIED | 4 YEARS OF TEACHING Experience..