Introduction to Plastics (Leaving Cert Engineering): Flashcards
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Practise the cards
13 cards from this deck
What type of material is plastic?
What type of material is plastic?
Synthetic or artificial polymer
What are polymers made of?
What are polymers made of?
Many smaller units called monomers
Process of creating polymers from monomers
Process of creating polymers from monomers
Polymerization
First manufactured plastic, inventor & year
First manufactured plastic, inventor & year
Parkesine, Alexander Parkes, 1862
Major safety problem with celluloid
Major safety problem with celluloid
Highly flammable
Who discovered Bakelite and when?
Who discovered Bakelite and when?
Leo Hendrik Baekeland in 1907
Key property of thermoplastics when heated
Key property of thermoplastics when heated
Can be remelted and reshaped multiple times
Key property of thermosets once formed
Key property of thermosets once formed
Cannot be remelted or reshaped
Molecular structure of thermoplastics
Molecular structure of thermoplastics
Chain-like (like a string of pearls)
Molecular structure of thermoset plastics
Molecular structure of thermoset plastics
Three-dimensional network structure
What are plastic additives?
What are plastic additives?
Chemicals incorporated into polymers to modify and improve their properties
Function of plasticizers in plastics
Function of plasticizers in plastics
Make plastics more flexible and softer
Purpose of flame retardants in plastics
Purpose of flame retardants in plastics
Prevent, delay, or slow combustion for fire safety