1. Plastics Flashcards

1
Q

What raw material is plastic made from?

A

oil

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2
Q

Where did oil come from?

A
  • Oil was created millions of years ago during the time of the dinosaurs
  • It was made by sea creatures that fell to the sea floor
  • Over a period of time a layer of mud formed over the bodies of the creatures
  • then over a much longer period of time the mud turned to rock which pressure down and turned it into oils
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3
Q

What are two issues surrounding plastics?

A
  • It is not sustainable, most products made from plastic end up in a landfill
  • it is not biodegradable
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4
Q

What are the two major types of plastics?

A
  • thermoplastics
  • thermosetting plastics
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5
Q

What is a thermoplastic?

A

A plastic that can be melted and reshaped over and over again

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6
Q

Can thermoplastics be recycled?

A

Yes

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7
Q

What are thermosetting plastics?

A
  • Plastics that cannot be reshaped
  • they retain their form ever in extreme heat
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8
Q

can thermosetting plastics be recycled?

A

They are difficult to recycle

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9
Q

What are the 2 main examples of thermosetting plastics?

A
  • urea formaldehyde
  • polyester resin glue
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10
Q

What is urea formaldehyde used for?

A

electrical casings: plugs, electrical sockets

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11
Q

What are the properties of urea formaldehyde?

A
  • toxic fumes given off if heated
  • stiff/hard/brittle
  • scratch resistant
  • stain resistant
  • high tensile strength
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12
Q

What is polyester resin glue?

A

gorilla glue

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13
Q

What are the properties of polyester resin glue?

A
  • very good resistance to water
  • hard
  • brittle
  • good heat and chemical resistance
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14
Q

What are the 2 main examples of thermoplastics?

A
  • Acrylic
  • polythene
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15
Q

What are the properties of acrylic?

A
  • lightweight
  • durable
  • can be recycled
  • polished finishes well
  • comes in a range of colours
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16
Q

What are the disadvantages of acrylic?

A
  • relatively soft
  • scratches easily
  • poor chemical resistance
  • relatively low impact strength
17
Q

What are the properties of polythene?

A
  • tough
  • resistant to chemical
  • soft and flexible
  • good electrical insulator
  • excellent chemical resistance
18
Q

What are the disadvantages of polythene?

A
  • can be recycled but not easily
  • most ends up in landfill
19
Q

What is PET?

A

a form of polyester that is an excellent water and moisture barrier material

20
Q

What is PET used for?

A

plastic bottles

21
Q
A