Thermosetting Polymers (Thermosets) (Leaving Cert Engineering): Flashcards
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Alternative name for thermosetting polymers
Alternative name for thermosetting polymers
Thermosets
Two common examples of thermosets
Two common examples of thermosets
Bakelite and epoxy resins
Can thermosets be reheated and remoulded once set?
Can thermosets be reheated and remoulded once set?
No
Manufacturing process used to produce thermosets
Manufacturing process used to produce thermosets
Condensation polymerisation
Small molecule eliminated in condensation polymerisation
Small molecule eliminated in condensation polymerisation
Water ()
Starting materials for thermosets production
Starting materials for thermosets production
Two distinctly different molecules
Two molecules that react to form Bakelite
Two molecules that react to form Bakelite
Phenol and formaldehyde
Type of structure in thermosets
Type of structure in thermosets
Cross-linked or networked structure
Type of bonding throughout thermoset structure
Type of bonding throughout thermoset structure
Primary bonding
Physical properties of thermosets
Physical properties of thermosets
Rigid and brittle
Do thermosets have long polymer chains?
Do thermosets have long polymer chains?
No, they have complex cross-linked networks instead
Is thermoset setting reversible or irreversible?
Is thermoset setting reversible or irreversible?
Irreversible
Structure difference: thermosets vs thermoplastics
Structure difference: thermosets vs thermoplastics
Cross-linked networks vs long polymer chains
Common early use of Bakelite
Common early use of Bakelite
Electrical switches and housings
Why are thermosets heat resistant?
Why are thermosets heat resistant?
Strong primary bonding network maintains shape at high temps