Plastic Materials

The dilemma of plastics is based on,

• The discussion about if plastics are good or bad

• The consideration of advantages of using plastics

• The list of problems coming from the use of plastics

• The possibility to use plastic materials instead of metallic material

To make orthopaedic devices and electrical insulations it is used:

• Polypropilene

• Silicone

• Neoprene

• Melamine

What is the correct combination between types of plastic and polymer chains:

• Thermosets<>Linear chains

  Elastomers<>Criss-cross chains

  Thermoplastics<>Coiled chains

• Thermoplastics<>Criss-cross chains

  Elastomers<>Coiled chains

  Thermosets<>Linear chains

• Elastomers<>Coiled chains

  Thermosets<>Criss-cross chains

  Thermoplastics<>Linear chains

• Thermoplastics<>Linear chains

  Thermosets<>Coiled chains

  Elastomers<>Criss-cross chains

One of the following plastic is not a Thermoset:

Malamine, Neoprene, Bakelite, Polyester Resins.

Write which of them

One of the following sentences is not true, what is it?

• Once thermosets have been shaped, they cannot be remelted to create different forms

• Thermoplastics can be formed and melted as many times as we like because their polymers have strong bonds

• Elastomers degrade easily with heat and cannot be remelted once they have been formed

Plastics must be used in accordance with,

• The rule of the 3R, Reduce, Recycle and Review

• The rule of 5R, Reduce, Recycle, Reuse, Repair and Recover

• The rule of 4R, Reduce, Recycle, Review and Replace

1. Plastic materials are classified by...

• • a) The structure of their polymer chains

• • b) How easily they melt

• • c) How easily they can be modelled

3. We can use the plastic extrusion process to produce...

• • a) Sheets of plastic and objects with hollow cavities

• • b) Cylindrical tubes but not square ones

• • c) Tubes with different profiles depending on the shape of the extrusion nozzle

The chain formed by a bond of ..............(a) is called a .................(b)

(Select one word for (a) and another one for (b))

• a) Ethylenes

  b) Polyethylene

• a) Carbons

  b) Thermoplastic

• a) Monomers

  b) Polymer

• a) Hydrogens

  b) Polyhydrogen

4. By blow moulding plastics, we can produce...

• • a) Thin, flexible plastic sheets

• • b) Extruded plastic tubes

• • c) Hollow plastic objects created from tubes made by extrusion