Question

The glass transition temperature will (circle the correct answer): a. ( increase / decrease ) as the molecular weight increases. b. ( increase / decrease ) as the strength of the chain-chain bonding decreases. c. ( increase / decrease ) as the pressure increases (we did not cover this in the notes but what do you think should happen).

Answer 1

a) There will be an increase in the glass transition temperature when the molecular weight increases. Based on Fox-Flory equation, with the increase in molecular weight, the transition temperature of glass also increases.

b) There will be a decrease in the glass transition temperature when the strength of the chain-chain bonding decrease as intermolecular force between the bonds reduces resulting in the decrease in the glass transition temperature.

c) There will be an increase in the glass transition temperature when the pressure increases as enhancement in pressure decreases the free volume in the surroundings and enhance the bond interaction resulting in the increase in the glass transition temperature.