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Plastics

Info on plastics

QuestionAnswer
What are the two types of plastics? Thermoplastics Thermosetting plastics
Can thermosetting plastics melted again into a new product? No
Can thermoplastics be melted again into a new product? Yes
Why can't thermosetting plastics be remoulded? Have strong permanent cross-links between the polymer chains which heat is unable to break.
Why can thermoplastics be remoulded? Have weak temporary cross-links between the polymer chains which heat is able to break.
Polymerisation: All plastics come from taking a monomer and joining it to lots of others to make a chain. This is a polymer.
Are plastics renewable or non-renewable? Non-renewable. Someday they will run out.
Name three examples of thermosetting plastics 1. Urea Formaldehyde 2. Melamine Formaldehyde 3. Epoxy Resin
Properties of Urea Formaldehyde 1. Heat resistant 2. Scratch resistant 3. electrical insulator
Properties of Melamine Formaldehyde 1. Hard 2. Scratch and stain resistant
Properties of Epoxy Resin 1. Hard 2. electrical insulator 3. chemical resistant to wear and tear.
Uses of Urea Formaldehyde Electrical fittings: E.g. plus sockets.
Uses of Melamine Formaldehyde Plastic cups and plates and other tableware.
Uses of Epoxy Resin Araldite adhesive
Name three examples of Thermoplastics 1. Acrylic 2. PVC (Rigid) 3. PET
Properties of Acrylic 1. transparent (see through) 2. impact resistant 3. can be blow moulded
Properties of PVC (Rigid) 1. UV light resistant 2. flammable 3. can be injection moulded
Properties of PET 1. stiff 2. chemical resistant 3. can be blow moulded
Uses of Acrylic 1. Signs 2. baths 2. car lights
Uses of PVC (Rigid) 1. pipes (plumbing) 2. shoe soles 3. floor/wall coverings
Uses of PET 1. Bottles for up to 2 litres capacity
Created by: supercars