Characteristics and Applications of Polymers - Factors That Influence Melting and Glass Transition Temperatures

6 important questions on Characteristics and Applications of Polymers - Factors That Influence Melting and Glass Transition Temperatures

What influences the melting temperature of a polymer?

Molecular chemistry and structure have affect on the ability to rearrange, and therefor the melting temperature.

How does chain stiffness effect the melting temperature?

The stiffer the chain the higher Tm.

Which factors, that influence chain stiffness, increase Tm?

- Double bonds or aromatic groups
- Bulky or large side groups
- Polar groups
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How does molecular weight influence melting temperature?

Increasing the average molecular weight of a polymer will raise the melting temperature.

How does the degree of branching affects the melting temperature of a polymer?

When there are more side branches the crystal regions will have more defects. This will lower the melting temperature.

How does the degree of branching influence the Tg?

A small amount of branching lowers the Tg, but a high density of branches raises the Tg.
Crosslinking highly restricts molecular motion and these polymers will not experience a glass transition.

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