Dissemination of IT for the Promotion of Materials Science (DoITPoMS)

# Summary

You should now be familiar with the following concepts:

• Above Tg polymers are rubbery, whereas below Tg they are glassy

• Rubbery behaviour arises from the polymer's ability to change its conformation at high temperatures

• Glassy behaviour arises from the polymer's lack of ability to change its conformation at low temperatures

• Many factors affect the Tg of a polymer. Some factors are to do with the chemistry of the polymer:

• chain length
• chain flexibility
• side groups
• branching