Show:
What The Plastic?!
Thermoplastics and Thermosets
Stupid Answers
100
four advantages of using polymers over metallic materials
What is Low cost, ease of manufacture, corrosion resistance, resistance to chemicals, low thermal & electrical conductivity, low density, high strength-to-weigh ratio, noise reduction, wide choice of colors and transparencies
100
A reversible process in which a polymer that turns to a liquid when heated and freezes to a very glassy state when cooled sufficiently.
What is a thermoplastic?
100
Extremely large molecules that make up plastics and distinguishes them
What is Macromolecules?
200
Raw materials for making synthetic organic plastics are extracted from what two things
What is Coal & Petroleum
200
The development of wedge-shaped, narrow regions of highly deformed spongy material
What is crazing?
200
The crystalline regions in polymers
What is Crystallites?
300
basic building block of a polymer
What is a monomer
300
Polymers created by cross-linking of long-chain molecules with strong covalent bonds.
What are thermosets?
300
Name of polymers that conduct electricity and name of polymers that conduct heat
What is Electrically conducting polymers and Thermally conducting polymers, respectively
400
What are the two main polymerization processes and what are the differences between the two?
The two main processes are condensation and addition. In condensation, polymers are produced by the formation of covalent bonds between two types of reacting mers and reaction by-products are condensed out. Addition is bonding without reaction by-products
400
two differences between thermoplastics and thermosets
Unlike its counterpart, the thermosetting process that creates thermosets are irreversible.Thermosets don't have a sharply defined glass-transition temperature... aren't They?
400
Temperature at which Polymers become more glass-like when cooled below it
What is Glass-transition temperature?
500
Name four structures of polymer chains and which are the two create the strongest polymers.
What is Linear, Branched, Cross-linked, and Network. The Cross-linked and Network are the strongest because they have stronger secondary bonds.
500
Thermosets possess better mechanical, thermal, & chemical properties, electrical resistance, and dimensional stability.
Why are thermosets better than thermoplastics?
500
These things are compounded with (added to) polymers to modify and improve certain characteristics.
What are Additives?