Preparation of clay/poly(methyl methacrylate) organic-inorganic hybrid gas barrier films via photopolymerization

Abstract

Clay/poly(methyl metacrylate) (PMMA) organic-inorganic hybrid gas barrier layers on PP were prepared by photopolymerization. The effects of clay content on the oxygen barrier property and surface hardness of the films were investigated. Oxygen permeability coefficients of the hybrid layer was small and about eight times higher than that of poly(vinylidene chloride) (PVDC) and water vapor transmission rate of the hybrid layer was the same order of PVDC. Pencil hardnesses (50 g load) of the PP with the hybrid layers were more than B. These values were considerably higher than that of PP (6B). These properties were thought to be due to well dispersion of inorganic segments (clay) and organic segments (PMMA) in the hybrid. From the results, it was found that the organic-inorganic hybrids could be applicable to gas barrier films.

Preparation, structure, and properties of poly(vinyl acetate-co-methyl methacrylate) nanocomposite microspheres with exfoliated montmorillonite through using two-stage in situ suspension polymerization

“…Pencil hardness of the nanocomposites is listed in Table . As we can see, the nanocomposites with 2.5 wt% I‐MMT and higher loading of I‐MMT passes HB pencil hardness, likely due to the reason of exfoliated state of the nanocomposites to increase the surface hardness . The pencil hardness of the pure copolymer and the nanocomposites with lower 0.5 to 1.5 wt% I‐MMT loading fails for HB.…”

Gas barrier properties of inorganic–organic nanocomposite gas barrier membranes with high content of layered double hydroxide (LDH) using surface modified LDH

“…Polymer/clay nanocomposites as advanced plastic materials have been studied by significantly improving polymer properties with low clay content in mechanical and thermal properties 2),10) and gas barrier properties. 6),7), 11) The preparation of polymer/clay nanocomposites with higher clay volumes may be a promising way to further improve properties. However, it is difficult to form a clay-rich nanocomposite with transparency and flexibility, which is rarely reported in the literature.…”