Thermal Effects Flashcards
What is heat?
A form of energy related to atoms and molecules vibrating due to the temperature.
What is temperature?
A measure of the amount of heat in an object.
Define heat capacity.
Energy needed to heat 1kg of a material by 1K.
Define thermal expansion coefficient (alpha).
Thermal strain per degree of temperature change.
Define thermal conductivity.
Rate at which heat is conducted through a solid at steady state.
How does temperature affect structure?
Nucleation
Solid-liquid interface
Impingement
Solid grains
As temperature increases, what are the stages of polymer structures?
Rigid
Leathery
Rubbery
Viscous
Define glass temperature.
Temperature at which material transitions from a hard glass to soft rubber.
Why is it important to compare the glass temperature and melting temperature?
Equation for thermal expansion.
alpha = 1/L △L/△T [1/K]
