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Bio Based Active Barrier Materials and Package Development

Miranda, Michael Angelo
http://orcid.org/0000-0003-4207-1301
http://rave.ohiolink.edu/etdc/view?acc_num=toledo1483450387453053

Abstract Details

2016, Doctor of Philosophy, University of Toledo, Chemical Engineering.
The food and packaging industries are interested in approaches to reduce the permeability of oxygen in polyethylene terephthalate (PET) to extend the shelf-life of product. This has led to considerable research in barrier improvement including the use of active scavenger that permanently bind oxygen. The purpose of this work is to investigate the use of renewably sourced unsaturated fatty acids as scavengers to reduce the O¬2 permeability in PET. Specifically fatty acids were characterized and incorporated within PET using both blended and reactive extrusion to analyze the impact on thermal-mechanical and oxygen transport properties. Oleic, linoleic and linolenic acid are renewably resourced unsaturated fatty acids that are being investigated as active scavenger. Utilization of scavenger capacity and kinetics of oxidation are two key parameters that must be considered while selecting a scavenger. The O¬2 uptake capacities and the utilization of scavenger sites analysis were used to determine the most appropriate scavenger used to make a copolymer with PET. Linoleic acid was chosen due to its higher utilization capacity and relatively fast kinetics the cost was also taken into account. Thus linoleic acid was used in preparation of PET/Scavenger system. The effect of addition of unsaturated fatty acid on the thermal, mechanical properties and morphology of PET, were analyzed by preparing blends of PET/linoleic acid of loading of (0.25-2 weight %). The presence of the scavenger were analyzed using end group analysis where an increase in carboxyl end group was determined and NMR to obtain the peaks for the fatty acid. The appropriate method to determine molecular weight was also established. Effects of permeation through amorphous and biaxial oriented films with and without linoleic acid were investigated. The bottles were produced in two different ways (i) reactive extruded bottle and (ii) blended bottles (0.5% weight loading of Linoleic acid). The mechanical properties and density of the bottles were similar. The oxygen permeability of these bottles side wall was lower than that of PET. NMR on sample that has been exposed to oxygen was conducted to confirm the reactivity of linoleic acid with oxygen.
Maria Coleman (Committee Chair)
Saleh. A. Jabarin (Committee Co-Chair)
Sridhar Vimajala (Committee Member)
Yakov Lapitsky (Committee Member)
Young- Wah Kim (Committee Member)
248 p.
Chemical Engineering; Gases; Packaging; Polymers

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Citations

  • Miranda, M. A. (2016). Bio Based Active Barrier Materials and Package Development [Doctoral dissertation, University of Toledo]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1483450387453053

    APA Style (7th edition)

  • Miranda, Michael. Bio Based Active Barrier Materials and Package Development. 2016. University of Toledo, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=toledo1483450387453053.

    MLA Style (8th edition)

  • Miranda, Michael. "Bio Based Active Barrier Materials and Package Development." Doctoral dissertation, University of Toledo, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1483450387453053

    Chicago Manual of Style (17th edition)

toledo1483450387453053
422
© 2016, all rights reserved.
This open access ETD is published by University of Toledo and OhioLINK.