Oxygen barrier property of polypropylene-polyether treated clay nanocomposite

Abstract

Abstract. Polypropylene (PP) nanocomposites were obtained by solution blending of polyether treated montmorillonite and PP, with a coupling agent of maleic anhydride grafted polypropylene (PP-g-MA). The composition of the inorganic clay was varied in 1, 2 and 5 phr (parts of clay per hundred of PP by mass) while films of the composites were obtained via compression molding. Wide-angle X-ray scattering (WAXS) showed nanocomposites in which silicate layers were exfoliated and intercalated with respect to the different clay ratios. The morphology and gas permeability of hybrids prepared with organoclay were compared. Morphological studies using transmission electron microscopy showed most clay layers were dispersed uniformly in the PP matrix. Some tactoids of agglomerated nanoparticles were detected, as clay content increased. The oxygen permeability for all the hybrids for clay loadings were reduced by 30% of the corresponding values for pure PP.

Influence of kaolin addition on the dynamics of oxygen mass transport in polyvinyl alcohol dispersion coatings

“…The orientation is more random in the coatings with a lower kaolin load, whereas the kaolin platelets are forced to orient more in the layer for the thinner coatings, Table 1 column 5. Another factor that could influence the mass transport process is the degree of exfoliation of the clay particles, where the exfoliated clay particles are suggested to delay the transport of gas molecules through their capturing capacity (molecular sieves) (Pannirselvam et al 2008). However, this was not addressed in this study and the used experimental conditions are not likely to have induced differences in the analysed materials that could explain the observed mass transport behaviour Fig 4 shows the vibrations for the crystalline PVOH polymer in the 1140-1145 cm -1 region and the amorphous PVOH polymer in the region 1090-1096 cm -1 for some barriers (PVOH, PVOHk5.8 and PVOHk38) (Peppas 1977, Kozlov et al 2003.…”

Investigation of correlation between dielectric parameters and nanostructures in aqueous solution grown poly(vinyl alcohol)-montmorillonite clay nanocomposites by dielectric relaxation spectroscopy

“…Synthesis and structural characterization of polymer-clay (organic-inorganic) nanocomposites (PCNs) are of technological interest due to significant improvement in the useful properties of composite materials over those of the pure polymer [1][2][3][4][5][6][7][8][9][10][11][12]. For the preparation of poly(vinyl alcohol) (PVA)-layered silicate nanocomposite, montmorillonite (MMT) clay is the most commonly used, which has hydrophilic property, and 2:1 phyllosilicate laminar structure.…”

Low frequency dielectric relaxation processes and ionic conductivity of montmorillonite clay nanoparticles colloidal suspension in poly(vinyl pyrrolidone)−ethylene glycol blends

“…Swelling of the clay is mainly due to solvent intercalation (absorption) in the clay galleries, and also because of the adsorption of solvent molecules on the hydroxylated aluminate clay surfaces through H-bond interactions, which results the clay exfoliation. The intercalated and exfoliated clay sheets in polymeric solvent results the organic-inorganic nanocomposites of highly complicated structures, which is responsible for the improved thermal, mechanical, gas barrier and electrical properties of the polymer-clay nanocomposites (PCNs) [6][7][8][9][10][11][12][13][14][15][16][17][18]. The investigation of broadband dielectric spectroscopy (BDS) of the materials covers nowadays the extraordinary spectral range from 10 -6 to 10 12 Hz [19].…”