Abstract
Polyethylene naphthalate (PEN) is a polyester polymer with well-known good barrier properties. PEN had been used in the food packaging area till 2012 especially as refillable bottles for soft drinks, juices, and beer. Now, PEN is mainly used in technical applications, e.g., for data storage tapes and organic light-emitting diode (OLED) applications. The aim of the study was the determination of the diffusion coefficients of organic molecules (n-alkanes, 1-alcohols) in PEN. Diffusion and partition coefficients were determined from the lag times of the permeation process of the permeants through a commercial 12 μm biaxial-oriented PEN film. In addition, activation energies of diffusion EA were calculated according to the Arrhenius approach. The activation energy of diffusion EA follows a correlation with the molecular volume V of the investigated permeants. In addition, the preexponential factor D0 follows a correlation with the activation energy of diffusion EA. The results of this study for PEN (e.g., EA, DP) were compared to literature data on PET.
Highlights
Polyethylene naphthalate (PEN) is a polyester polymer with well-known good barrier properties
PEN had been used in the food packaging area till 2012 especially as refillable bottles for soft drinks, juices, and beer
PEN is mainly used in technical applications, e.g., for data storage tapes and organic light-emitting diode (OLED) applications
Summary
Polyethylene naphthalate (PEN) is a polyester polymer with well-known good barrier properties. Due to its favourable properties, PEN had been used in the food packaging area, e.g., as material for refillable bottles for soft drinks, juices, and beer [5]. As another advantage, the higher glass transition temperature of PEN (124°C) compared to PET (70°C) allows higher temperatures in the washing process of the refillable bottles as well as being hot-filled. The improved thermal and barrier properties such as resistance to oxidation make PEN an interesting polymer for technical applications, e.g., for data storage tapes and organic light-emitting diode (OLED)
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