Inorganic-organic polymers with barrier properties

Inorganic—Organic Polymers with Barrier Properties Against... 

Inorganic—Organic Polymers with Barrier Properties Against Water Vapor, Oxygen and Migrating Monomers... 

INORGANIC-ORGANIC POLYMERS WITH BARRIER PROPERTIES... 

Nowadays, ordered inorganic/organic PNs with a finely tuned structure have displaced a lot of traditional composite materials in a variety of applications because the intimate interactions between components can provide enhancement of the bulk polymer properties (i.e., mechanical and barrier properties, thermal stabihty, flame retardancy, and abrasion resistance). The reinforcing nanoparticle/ polymer adhesion is of primarily importance, as it tunes the final properties of the nanocomposite. Polymer/clay nanocomposites (PCNs) meet this demand due to the platelet-type dispersion of the clay filler in the organic matrix [1]. 

Inorganic-organic polymers already exhibit good barriers on polymeric substrates. However, in combination with an inorganic barrier layer their barrier properties are improved not only by the coating thickness, but also through the interaction with the MeO layer. These synergistic effects can be illustrated for different multilayer structures by three theoretical models (see Fig. 21-22(a)-(c)). 

Recentiy, a new class of organic-inorganic hybrid materials based on the ultra incorporation of nano-sized fillers (nanofillers) into a polymer matrix has been investigated. Nanotechnology is the aptitude to work on a scale of about 1-100 nm in order to understand, create, characterize and use material structure, devices, and system with unique properties derived from their base on the nanostructures. Nanocomposites could exhibit exclusive modifications in their properties, compared with conventional composites in terms of physical properties, including gas barrier, flammability resistance, thermal and environmental stability, solvent uptake, and rate of biodegradability of biodegradable (Chivrac et al. 2009). 

Organic/inorganic nanocomposites prepared by in situ polymerization methods have received extensive attention in recent years. Unlike microscale fillers, nanoscale fillers can offer excellent properties to a polymer matrix. Nanosized filler, with a few weight percent in the reinforced polymer nanocomposites, strongly influences the macroscopic properties of the polymer. The resultant polymer nanocomposites can significantly improve some of their properties, such as higher heat distortion temperatures, enhanced flame resistance, increased modulus, better barrier properties, reduced thermal expansion coefficient, and altered electronic and optical properties. 

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