CLICK HERE FOR INDEX PAGE
 
REVISION CARDS - POLYURETHANE AND FOAM RUBBER
V.Ryan © 2015
 
PDF FILE - CLICK HERE FOR PRINTABLE WORKSHEET
     

DISCOVERY OF POLYURETHANE

In1937, Otto Bayer mixed two chemicals, polyol (an alcohol) and isocyanate (sometimes called isonitrile or carbylamine).

The two chemicals formed a solid plastic. The resulting plastic was polyurethane (PUR), a new plastic.

 

PROPERTIES OF POLYURETHANE: Can be either thermoplastics or thermosetting. Can be cast and injection moulded. Long lasting. Performs well in high temperatures, but can be damaged / attacked by most solvents. Has low heat transfer / conductivity, consequently a good insulator. Has high resistance to abrasion. It can be manufactured in a range of colours.

 

FOAM RUBBER

When mixing two chemicals, polyol (an alcohol) and isocyanate (sometimes called isonitrile or carbylamine) with the addition of a small amount of water, the solution ‘fizzes’, forming foam rubber.

PROPERTIES OF FOAM RUBBER: Lightweight and flexible. Ideal of cushions or as a dense rigid material ideal for the trays. Resists impacts and is often used as protective packaging inserts. An excellent acoustic insulator, as it absorbs sound. Resists high temperatures (200oC) and consequently can be used to reduce sound from car engines. Performs well in high temperatures. Can be damaged / attacked by most solvents. It has low heat transfer / conductivity, consequently a good insulator.

 
 
 

 

POLYURETHANE PRODUCTS

FOAM RUBBER PRODUCTS

 

 
 
 
 
QUESTIONS
 
1. Name the two materials discovered / invented in 1937 by Otto Bayer? 2 marks
 
 
 
2.List three products manufactured from Polyurethane and three manufactured from Foam Rubber. 6 marks
 
 
 
 
 
 
 
 
3. Describe three physical properties possessed by Foam Rubber. 3 marks
 
 
 
 
 
 
CLICK HERE FOR RESISTANT MATERIALS INDEX PAGE
 
 
Google
 
Web www.technologystudent.com