Resin: Resin is the basic building materials which constitute the greater bulk of plastics and which have undergone polymerization condensation reactions during their preparation.
Plastic have certain unique properties
Lightness in weight : sp. Gravity -1 to 2.4
Good thermal and electrical insulator.
Corrosion –resistance.
Easy workability.
Adhesiveness.
Low fabrication cost in to desired shaped products,
Decoration surface effect.
Easy moulding.
Insect resistant.
Low thermal expansion coefficient.
Lightness in weight : sp. Gravity -1 to 2.4
Good thermal and electrical insulator.
Corrosion –resistance.
Easy workability.
Adhesiveness.
Low fabrication cost in to desired shaped products,
Decoration surface effect.
Easy moulding.
Insect resistant.
Low thermal expansion coefficient.
Classification of Plastic
(1) Thermosetting resins (2) Thermoplastic resins
(A) Thermoplastic resins :Poly ethylene (PE) obtained by the polymerization of ethylene.
(1) Thermosetting resins (2) Thermoplastic resins
(A) Thermoplastic resins :Poly ethylene (PE) obtained by the polymerization of ethylene.
By using free radical initiator, low density polyethene ( L D P E ) is obtained .Ionic catalyst : (HDPE) High density polyethene is obtained .
1. Preparation : 
Low density polyethene
2. Properties : polyethene produced by high pressure process has a branched structure and, therefore is flexible and tough.
Non polar polymer, back bone flexible (LDPE) temp. 115o C.
Film carries bags, gen. packing
Excellent insulation properties.
1. Preparation
High density polyethene (HDPE) : Low density polyethene 2. Properties : polyethene produced by high pressure process has a branched structure and, therefore is flexible and tough.
Non polar polymer, back bone flexible (LDPE) temp. 115o C.
Film carries bags, gen. packing
Excellent insulation properties.
1. Preparation
2.Properties :
Low pressure process result in a completely linear
Polyethylene having higher density and better chemical resistance. It have excellent electrical insulator.
Temp 135oC, Film carries wrapping ,food production
Polyamides : are synthetic polymers , which have recurring amide groups. Nylons , used mostly for making fibers.
Low pressure process result in a completely linear
Polyethylene having higher density and better chemical resistance. It have excellent electrical insulator.
Temp 135oC, Film carries wrapping ,food production
Polyamides : are synthetic polymers , which have recurring amide groups. Nylons , used mostly for making fibers.
Nylon - 6: 6 : is obtained by the polymerization of adipic acid with hexa methylene diamine.
Nylon-6 :is produced by self condensation of epsila– amino caproic acid
Nylon-11 is made by self –condensation of -amino undecanoic acid.
Properties of Nylon
1.Nylons are translucent and whitish and having high melting point .
2. They show good resistance to abrasion and high tensile strength, high thermal stability.
1.Nylons are translucent and whitish and having high melting point .
2. They show good resistance to abrasion and high tensile strength, high thermal stability.
Uses of Nylons
- Nylon -6,6 is used in the preparation of - sheets , fibers for cloth weaning, ropes bristles, tyre, cord brushes, monofilament etc .
- Nylon -6,6 is used in the preparation of - sheets , fibers for cloth weaning, ropes bristles, tyre, cord brushes, monofilament etc .
Good substitute for metals in gears and bearings.
-Nylon-6 and Nylon 11 is used in the preparation of textile fibers and threads present in tyres, ropes etc.
(B) Thermosetting Resins:
Bakelite: Phenol formaldehyde Resin ( PF)
Preparation : P F is synthesized by poly condensation between phenol and formaldehyde in the presence of acidic or alkaline catalyst.
-Nylon-6 and Nylon 11 is used in the preparation of textile fibers and threads present in tyres, ropes etc.
(B) Thermosetting Resins:
Bakelite: Phenol formaldehyde Resin ( PF)
Preparation : P F is synthesized by poly condensation between phenol and formaldehyde in the presence of acidic or alkaline catalyst.
Properties: Bakelite is rigid hard, resistant to scratch, non- oxidizing
acids salt and many organic solvents .
Use of PF : used for moulding electrical items , telephone instrument ,Cabinets for radio, TV etc.
-used for making impregnation paper, fabric or abestos cloth.used for core binders in foundries when mixed with sand.
acids salt and many organic solvents .
Use of PF : used for moulding electrical items , telephone instrument ,Cabinets for radio, TV etc.
-used for making impregnation paper, fabric or abestos cloth.used for core binders in foundries when mixed with sand.
polyester resins - Terylene or Dacron.
Preparation : 
Properties : It is resistant to heat and moisture and unattacked by many chemicals .
- It has good mechanical strength up to 175oC
- wrinkle resistance and high starch resistance.
Use : - To make textile fibers .
- Making films , magnetic recording tapes , aluminised sheets .
Rubber or Elastomer
Synthetic Rubber : styrene rubber . (Buna -S)
Properties : It is resistant to heat and moisture and unattacked by many chemicals .
- It has good mechanical strength up to 175oC
- wrinkle resistance and high starch resistance.
Use : - To make textile fibers .
- Making films , magnetic recording tapes , aluminised sheets .
Rubber or Elastomer
Synthetic Rubber : styrene rubber . (Buna -S)
Properties : high abrasion resistance High loading bearing capacity
USE : Motor tyres , footwear component , shoes soles, Insulation of wires and cables carpet backing etc. 
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