12 Class Chapter 15- Polymers | Chemistry Notes Info - Your Chemistry Tutor provide notes for Classes, BSc, MSc, Chemistry Test

12 Class Chapter 15- Polymers

Polymer & Polymerization

Condensation Polymer: Nylon-6-6, Terylene.
Addition Polymer: Polythene, Neoprene.

Polymer Classification

Polymer Classification on the basis of Source:

1.    Natural Polymer: Protein, Cellulose, Rubber.
2.    Semi-synthetic Polymer: Cellulose Derivatives as cellulose acetate (Rayon), Cellulose Nitrate.
3.    Synthetic Polymer: Plastic (Polyethene), Synthetic Fibers ( Nylon 6-6), Buna-S.

Polymer Classification on the basis of Structure:

1.    Linear Polymer: High Density Polythene, Polyvinyl Chloride.
2.    Branched Chain Polymer: Low Density Polythene.
3.     Cross Linked or Network Polymer: Bakelite, Melamine.

Polymer Classification on the basis of Molecular Forces:

1.    Elastomers: Weak intermolecular forces. eg.- Natural Rubber, Synthetic Rubber.
2.    Fibers: Strong intermolecular forces. eg.- Polyamides (Nylon6-6), Polyesters (Terylene).
3.    Thermoplastic: Polythene, Polystyrene.
4.    Thermosetting: Bakelite, Urea Formaldehyde Resins.

Lower Density Polyethene  (L.D.P.) : prepared at 1000-2000 atm pressure, 350-570 Kelvin Temperature and O2 peroxide inhibitor.

Higher Density Polyethene  (H.D.P.) : prepared at 6-7 atm pressure, 333-343 Kelvin Temperature and Zieglar Natta Catalyst.

Monomer Formula
1.    Teflon
Oil seals, Gasket
2.    Polyacrylonitrile

Commercial Fibers
3.    Terylene or Decron
Ethylene Glycol
Teryphthalic Acid

Commercial Fibers
4.    Nylon 6,6


5.    Nylon 6
Adipic Acid


Making Sheets, bristles of brushes, textile industry, tyre cords, fabrics, ropes etc.
6.    Phenol Formaldehyde Polymer
i.                   Novolac
Phenol + Formaldehyde
Used in paints
ii.                 Bakelite
Phenol + Formaldehyde

Comb, Electric switches
7.    Malamine Formaldehyde Polymer
Malamine + Formaldehyde

Unbreakable crockery
8.    Buna S
1,3-Butadiene + Styrene

Auto tyres, cables insulation, floor tiles

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