Abstract
An investigation of the gasoline permeation resistance of the as-blow-molded polypropylene, polypropylene/ethylene vinyl alcohol (PP/EVOH), polypropylene/modified polyamide (PP/MPA) and polypropylene/blends of modified polyamide and ethylene vinyl alcohol (PP/MPAEVOH) bottles is reported. The gasoline permeation resistance improves slightly after blending EVOH barrier resins in PP matrices during blow-molding, wherein only broken and less demarcated EVOH laminas were found on the fracture surfaces of the PP/EVOH bottle. In contrast, much better permeation resistance and more clearly defined MPA and MPAEVOH laminas were found for PP/MPA and PP/MPAEVOH bottles, respectively. The gasoline barrier properties and MPAEVOH laminar structures of PP/MPAEVOH bottles improve and become more demarcated, respectively, as the MPA contents present in MPAEVOH resin increase. In fact, by using the proper composition, the gasoline permeation rate of PP/MPAEVOH bottle is about 113 and 11 times slower than that of the as-blow-molded PP and PP/MPA bottles, respectively. In order to understand these interesting gasoline barrier and morphological properties descried above, the melt shear viscosities, thermal properties, wide-angle X-ray diffraction patterns and Fourier-transform infrared spectra of the base resins used in these bottle specimens were investigated.
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Yeh, JT., Chen, HY. & Tsai, FC. Gasoline Permeation Resistance of Polypropylene, Polypropylene/Ethylene Vinyl Alcohol, Polypropylene/Modified Polyamide, and Polypropylene/Blends of Modified Polyamide and Ethylene Vinyl Alcohol Containers. J Polym Res 13, 451–460 (2006). https://doi.org/10.1007/s10965-006-9066-6
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DOI: https://doi.org/10.1007/s10965-006-9066-6