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

Abstract

Inorganicorganic nanocomposite gas barrier membranes with high content of layered double hydroxide (LDH) using surface modified LDH on plastic film were prepared by cross-linking reaction. The effect of LDH content on the gas barrier properties [oxygen permeation and water vapor transmission rate (WVTR)] of the membrane was investigated. The oxygen permeability coefficient of the nanocomposite layer was small, and about one-tenth of polyvinylidene chloride (PVDC) and WVTR (thickness 25¯m) of the nanocomposite layer was on the same order as PVDC. The pencil hardness (750 g load) of the nanocomposite membrane was higher than that of substrate, polyethylene terephthalate film. The value was HB. The balance between high gas barrier properties and hardness were thought to be due to the well-dispersed inorganic component (LDH) and organic component in the nanocomposite. From the results, it was found that the reported inorganicorganic nanocomposite membranes can be applied to gas barrier membranes.

Nonflammable UV protective films consisting of clay and lignin with tunable light/gas transparency

“…In particular, gas transmittance of the lms for He and O 2 gas could be controlled in the range of several mol m À2 s À1 Pa À1 , i.e., the OTR of the clay-lignin lm was a maximum of three orders of magnitude lower than poly(ethylene terephthalate) lms (2.0Â 10 À17 mol m m À2 s À1 Pa À1 ). 29 The lms could be prepared using an environmentally friendly process, i.e., by purication, mixing, and drying of clay mineral, lignin, and compatibilizer (as needed) in water, without hazardous chemicals. The resulting lms exhibited various functions, such as UV protection and tunable gas transmittance nature with incombustibility.…”

“…, the OTR of the clay–lignin film was a maximum of three orders of magnitude lower than poly(ethylene terephthalate) films (2.0× 10 −17 mol m m −2 s −1 Pa −1 ). 29 …”