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The effect of the molecular weight on the glass transition temperature in amorphous poly(ethylene terephthalate)

✍ Scribed by S. Montserrat; P. Colomer

Publisher
Springer
Year
1984
Tongue
English
Weight
306 KB
Volume
12
Category
Article
ISSN
0170-0839

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✦ Synopsis

The glass transition temperature of amorphous and fractionated poly(ethylene terephthalate) has been measured by differential scanning calorimetry. The application of the Fox-Flory equation for the range of molecular weights between 37100 and 4500 gives the values of Tg~ =342.4 K and Kg=51200. The low value of Kg is interpreted by the free volume theory. The flex energy of the chain is evaluated by the Gibbs-Di Marzio theory with a value of 1483 cal/mol. These results are compared with those obtained by other authors for the poly(ethylene adipate) and the poly (diethylene terephthalate).

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