【英文专版】A new transparent Polyethylene Terephthalate (4-Layer) Composite membrane with Superoxide Barr

A new transparent polyethyleneterephthalate(quad-layer) composite films with super oxygen barrier propertiesshow the great potential application in food packaging and flexible electronicpackaging. They propose here a transparent and super oxygen barrier PETcomposite film with nano-brick wall architectures by a quad-layer(QL )assembly.Nanobrick wall hybrid coating with super oxygen barrier properties werefabricated on PET film using a QL assembly of polyelectrolytes andnanoplatelets. A quad-layer assembly consists of three repeat units ofpolyacrylic acid (PAA), poly(dimethyl diallyl ammonium chloride) (PDDA) andlayered α -zirconium phosphate ( α -ZrP). PDDA with positive charges canassemble alternatively with both α -ZrP and PAA with negative charges to formnano-brick wall architectures on the surface of PET film via the electrostaticinteraction. The lamellar structure of α -ZrP platelets and the dense QLassembly coating can greatly reduce the oxygen transmission rate (OTR) of PETfilm. Compared to pristine PET film, the OTR of PET (QL) 19 is reduced from 57to 0.87 cc/m 2 /day. Moreover, even with 19 QLs coating, PET (QL) 19 compositefilm is still with an optical transparency higher than 90% and a haze lowerthan 10%.