Relationship between Tg, Tm and other transition temperatures

In some papers Boyer (1973-1985) discussed the other transition temperatures which are often encountered in polymers, and the relationships between these transitions and the two main transitions Tg and Tm. 

We shall give here Boyer s main conclusions. 

This relaxation involves a very short section of a polymer chain. It is often called the (3-relaxation. As a general rule 

It is found in both glassy amorphous and semi-crystalline polymers. 

10 A schematic plot of Tm versus Tg for some types of polymers (from Alfrey and Gurnee, 1967). 

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