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We analyzed the effects of clay layers on the barrier properties of polymer/clay nanocomposites containing impermeable and oriented clay layers. Using the relative permeability theory in combination with the detour theory, we obtained new relative permeability expressions that allow us to investigate the relative permeability R p as a function of lateral separation b, layer thickness w, gallery...
The crystalline structures of isotactic polypropylene (iPP) subjected to compression-molding were studied by means of differential scanning calorimeter (DSC), optical microscope (OM) and wide-angle X-ray diffraction (WAXD). β-crystal can be formed from nonisothermal crystallization of the sample compression-molded at the molten state and the β-phase content increased with increasing pressure of molding...
The structure, morphology and non-isothermal crystallization behavior of polypropylene catalloys (PP-cats) as well as pure polypropylene were investigated via differential scanning calorimeter (DSC), wide angle X-ray diffraction (WAXD) and real-time hot-stage optical microscopy (OM). The results reveal that the crystalline structures of PP-cats change with variations of the crystallization conditions...
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