Gas Permeability of Uniaxially Deformed Polyethylene and Polypropylene Films (CROSBI ID 544167)
Prilog sa skupa u zborniku | sažetak izlaganja sa skupa | međunarodna recenzija
Podaci o odgovornosti
Klepac, Damir ; Galić, Kata ; Valić, Srećko
engleski
Gas Permeability of Uniaxially Deformed Polyethylene and Polypropylene Films
Polyethylene (PE) and polypropylene (PP) films were mechanically deformed at room temperature in both parallel and perpendicular directions to their initial orientations obtained during manufacturing process. The degree of deformation (λ ), defined as λ =l/lo, l and lo being the length of the deformed and relaxed sample, respectively, was varied from 1.0 to 1.4 for polyethylene and from 1.0 to 1.9 for polypropylene. Oxygen transport was investigated by manometric method and the change in the degree of crystallinity was monitored by differential scanning calorimetry (DSC). Results of manometric and DSC measurements were compared with the free volume measurements carried out by electron spin resonance (ESR). Perpendicular deformation induces a significant increase in the oxygen permeability for both PE and PP. Contrary, parallel deformation decreases the oxygen permeability through PE for λ >1.3 and does not significantly affect the oxygen permeability through PP. The degree of crystallinity increases during perpendicular deformation of PE but does not significantly change during deformation of PP. The results obtained by ESR are in good agreement with the permeability measurements.
polyethylene; polypropylene; deformation; permeability; DSC; ESR
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Podaci o prilogu
187-187.
2008.
objavljeno
Podaci o matičnoj publikaciji
Book of Abstracts
Prag: International Life Sciences Institute - ILSI Europe
Podaci o skupu
4th International Symposium on Food Packaging - Scientific Developments Supporting Safety and Quality
poster
19.11.2008-21.11.2008
Prag, Češka Republika