Ritvirulh, Chonlada

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Preferred name
Ritvirulh, Chonlada
Alternative Name
Ritvirulh, C.
Main Affiliation
Email
chonlada.ri@kmitl.ac.th

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    Item type:Publication,
    Selective ethylene-permeable zeolite composite double-layered film for novel modified atmosphere packaging
    (2011-01-01)
    Monprasit, P.
    ;
    Ritvirulh, C.
    ;
    Sooknoi, T.
    ;
    Rukchonlatee, S.
    ;
    Fuongfuchat, A.
    The composite double-layered films, for the packaging application of postharvest fruits and vegetables, were prepared by laminating low-density polyethylene (LDPE) and poly[styrene-b-(ethylene-co-butylene)-b-styrene] (SEBS) modified with zeolite ZSM-5. The film was characterized by scanning electron microscope and differential scanning calorimeter and tested for permeation of ethylene (C<inf>2</inf>H<inf>4</inf>), oxygen (O<inf>2</inf>), carbon dioxide (CO<inf>2</inf>), and water vapor. It was found that the C<inf>2</inf>H <inf>4</inf> permeability of the films was improved because of an enhanced adsorption of C<inf>2</inf>H<inf>4</inf> by the incorporated zeolite (0-10 wt%). The preconcentrated layer (zeolite/SEBS) leads to a higher C<inf>2</inf>H <inf>4</inf> concentration gradient across the film. Moreover, the high dispersion of zeolite increased the C<inf>2</inf>H<inf>4</inf> permeation. When compared with O<inf>2</inf> and CO<inf>2</inf>, the composite films were more selective to C<inf>2</inf>H<inf>4</inf>. However, the C<inf>2</inf>H<inf>4</inf> permeation decreased in the presence of O<inf>2</inf> because of a competitive adsorption. In addition, the films possessed appreciate tensile properties for packaging application. Copyright © 2009 Society of Plastics Engineers.
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    Item type:Publication,
    Hydrophobic zeolite-filled polymeric films with high ethylene permselectivity for fresh produce packaging applications
    (2014-10-01)
    Fuongfuchat, Asira
    ;
    Sirikittikul, Doungporn
    ;
    Booncharoen, Warintorn
    ;
    Raksa, Phatchareeya
    ;
    Ritvirulh, Chonlada
    Gas permselective plastic films have been in a great deal of attention in the area of modified atmosphere packaging of fresh produces. Such films must allow transport of the respiring gases, i.e. oxygen and carbon dioxide, in a controlled manner and, moreover, should efficiently remove ethylene gas. Therefore, the development of highly permeable films with high ethylene permselectivity, i.e. high in both permeability and selectivity, was carried out. The concept of 'mixed matrix membrane', by which enhanced gas permselectivity can be obtained by incorporation of zeolite particles into the polymeric film, was applied. Fine particles of hydrophobic zeolites, i.e. zeolite beta and ZSM-5, and the surface-modified zeolites were used in this study. The films with uniform distribution of zeolite particles (10% w/w) in 70LDPE/30SEBS (styrene-b-(ethylene-ran-butylene)-b-styrene block copolymer) matrix can be prepared by blow film extrusion. Significantly high ethylene permselectivity, i.e. ethylene permeability of 1.78-2.67 × 10<sup>3</sup> cm<sup>3</sup> · mm/m<sup>2</sup> · day · atm and ethylene/O<inf>2</inf> selectivity of 4.67-8.26, was obtained from the films containing octyl-modified and phenyl-modified zeolites. Particular enhancement was observed on the films containing phenyl-modified zeolites. Crystallinity of polyethylene, transition temperatures and decomposition temperature were, however, indifferent among the studied films. Nevertheless, elongation at break and toughness of the films containing surface-modified zeolites were superior. Particle-polymer interface could thus be improved.