Water sorption in poly(ethylene furanoate) compared to poly(ethylene terephthalate). Part 2: Kinetic sorption

作者：Burgess Steven K; Mikkilineni Dharmik S; Yu Daniel B; Kim Danny J; Mubarak Christopher R; Kriegel Robert M; Koros William J^*

来源：Polymer, 2014, 55(26): 6870-6882.

DOI：10.1016/j.polymer.2014.10.065

• Barrier
• Water transport
• Poly(ethylene furanoate)

Diffusion coefficients for water in amorphous poly(ethylene furanoate) (PEF) and poly(ethylene terephthalate) (PET) were studied at 35 degrees C over the entire water activity range. PEF exhibits a similar to 5x reduction in diffusion coefficient averaged over the entire concentration interval compared to PET. Fickian diffusion was observed for water in both polyesters up to similar to 0.6 activity, after which the presence of non-Fickian relaxations required treatment using the Berens-Hopfenberg modeling framework. Penetrant plasticization at high activity was found for both PEF and PET, as evidenced by a positive correlation between diffusion coefficient and increasing water concentration. Arrhenius interpretation of diffusion coefficients measured at 15, 25, 35, and 45 degrees C allowed calculation of the activation energies of diffusion for PEF and PET, which were similar at 47.1 +/- 2.8 kJ/mol and 46.4 +/- 3.0 kJ/mol, respectively. This study complements prior work pertaining to the equilibrium water sorption properties in both polyesters, and subsequently provides a detailed investigation of the water diffusion process in these materials.

• 出版日期2014-12-15