Production and Investigation of Properties of a Nanocomposite for Food Packaging

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Dadfar, Mohammad Ali | 2010

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 40603 (06)
University: Sharif University of Technology
Department: Chemical and Petroleum Engineering
Advisor(s): Alemzadeh, Iran; Vossoughi, Manuchehr
Abstract:
Nanocomposite films based on low density polyethylene (LDPE), containing of 2, 3, and 4 wt% organoclay (OC) and ethylene vinyl acetate (EVA) copolymer as a new compatibilizer were prepared and characterized using X-ray diffraction, tensile tests, and oxygen permeation measurements. There was no exfoliation or intercalation of the clay layers in the absence of EVA, while an obvious increase in d-spacing was observed when the samples were prepared with EVA present. This issue was reflected in the properties of nanocomposites. The oxygen barrier properties of the OC/EVA/LDPE film were significantly better than those of the OC/LDPE film. The average aspect ratio of clay platelets in nanocomposites was determined from permeability measurements and using Lape-Cussler model. In addition to barrier properties, the OC/EVA/LDPE film also had better elastic modulus than their counterparts without EVA. The modulus reinforcement of nanocomposites was studied using Halpin-Tsai equations, which are universally used for composites reinforced by flake-like or rod-like fillers
Keywords:
Mechanical Properties ; Compatibilizer ; Barrier Properties ; Polymer Layered Silicate Nanocomposite (PLSNs) ; Polyethylene-Clay Nanocomposite Film

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