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Pregled bibliografske jedinice broj: 550787

Oxygen permeability, electron spin resonance, differential scanning calorimetry and positron annihilation lifetime spectroscopy studies of uniaxially deformed linear low-density polyethylene film


Klepac, Damir; Ščetar, Mario; Kurek, Mia; Mallon, Peter E.; Luyt, Adriaan S.; Galić, Kata; Valić, Srećko
Oxygen permeability, electron spin resonance, differential scanning calorimetry and positron annihilation lifetime spectroscopy studies of uniaxially deformed linear low-density polyethylene film // Polymer international, 62 (2013), 3; 474-481 doi:10.1002/pi.4338 (međunarodna recenzija, članak, znanstveni)


Naslov
Oxygen permeability, electron spin resonance, differential scanning calorimetry and positron annihilation lifetime spectroscopy studies of uniaxially deformed linear low-density polyethylene film

Autori
Klepac, Damir ; Ščetar, Mario ; Kurek, Mia ; Mallon, Peter E. ; Luyt, Adriaan S. ; Galić, Kata ; Valić, Srećko

Izvornik
Polymer international (0959-8103) 62 (2013), 3; 474-481

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Polyethylene; uniaxial deformation; gas permeability; ESR - spin probe; PALS

Sažetak
Linear low-density polyethylene (PE-LLD) films were mechanically deformed at room temperature in both parallel and perpendicular directions to their initial orientation obtained during the manufacturing process. The degree of deformation λ, defined as λ = l/l0, l and l0 being the length of the deformed and relaxed samples, respectively, was varied from 1.0 to 2.0. Oxygen transport was investigated by a manometric method and the results were correlated with differential scanning calorimetry and positron annihilation lifetime spectroscopy measurements in order to investigate the contribution of various factors that influence the permeability of deformed PE-LLD films. An electron spin resonance spin-probe method was employed to determine the influence of uniaxial deformation on the chain segmental mobility in the amorphous phase. The results show that the deformation process reduces oxygen permeability and diffusion coefficients. It was found that the reduction is a combined effect of an increased crystallinity and reduced fractional free volume. The decrease of the chain segmental mobility with deformation plays an important role in the gas diffusion mechanism.

Izvorni jezik
Engleski

Znanstvena područja
Kemija, Prehrambena tehnologija



POVEZANOST RADA


Projekt / tema
058-1252971-2805 - Permeacijska svojstva nekih polimernih materijala za pakiranje hrane (Kata Galić, )
062-0000000-3209 - Strukturne i dinamičke promjene u sustavima makromolekula (Srećko Valić, )
062-0621341-0061 - Masne kiseline i polifenoli u regeneraciji i reparaciji tkiva. (Čedomila Milin, )

Ustanove
Prehrambeno-biotehnološki fakultet, Zagreb,
Medicinski fakultet, Rijeka,
Institut "Ruđer Bošković", Zagreb

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus


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