History of plastics

Polymers are constructed of large molecules that have repeating structures called subunits. Which of the following can polymers be found in?

• Nylon

• Silk

• PVC

• Cotton

Why was it necessary to find a replacement for Celluloid?

A common property of synthetic polymers (plastics) is that it starts soft and malleable until it is shaped and cooled too harden. There are several ways to do this but which process was just named?

• Blow Molding

• Compression Molding

• Injection Molding

• Rotational Molding

In your own words what is injection moulding?

List 3 plastic products that were just given as examples?