The magnitude of the activation energy for diffusion, ED. is shown to be inversely dependent on the fractional free volume of the polymer above Tg. From the proportionality of ED above and below Tg, the magnitude of El, below T, is also inversely dependent on the free volume in that temperature rang
β¦ LIBER β¦
Glass transition in polymers: dependence of the Kohlrausch stretching exponent on the kinetic free volume fraction
β Scribed by Valery P. Privalko
- Book ID
- 117149918
- Publisher
- Elsevier Science
- Year
- 1999
- Tongue
- English
- Weight
- 84 KB
- Volume
- 255
- Category
- Article
- ISSN
- 0022-3093
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## Abstract We present results of molecular dynamics simulations for freeβstanding and supported thin films of a nonentangled polymer melt using a coarseβgrained (beadβspring) model. Our discussion is mainly concerned with the equilibrium properties of the films above the critical temperature (__T_