Abstract
Nanobrick wall hybrid coating with super oxygen barrier properties were fabricated on polyethylene terephthalate (PET) film using a quadlayer (QL) assembly of polyelectrolytes and nanoplateles. A quadlayer assembly consists of three repeat units of polyacrylic acid (PAA), poly (dimethyl diallyl ammonium chloride) (PDDA) and layered α-zirconium phosphate (α-ZrP). PDDA with positive charges can assemble alternatively with both α-ZrP and PAA with negative charges to form nanobrick wall architectures on the surface of PET film via the electrostatic interaction. The lamellar structure of α-ZrP platelets and the dense QL assembly coating can greatly reduce the oxygen transmission rate (OTR) of PET film. Compared to pristine PET film, the OTR of PET (QL)19 is reduced from 57 to 0.87 cc/m2/day. Moreover, even with 19 QLs coating, PET (QL)19 composite film is still with an optical transparency higher than 90% and a haze lower than 10%. Therefore, the transparent PET (QL)n composite films with super oxygen barrier properties show great potential application in food packaging and flexible electronic packaging.
Highlights
Barrier materials have been widely used in the fields of food preservation, pharmaceuticals and electronic packaging to protect them from detrimental effect of moisture and oxygen in the environment [1]
In order to get polyethylene terephthalate (PET) composite film with super gas barrier properties, several methods have been reported, such as: (1) Melt blending with higher barrier polyamides [21] or nanoplates [22], (2) Deposition of a thin SiOx or metal oxide onto a surface by vacuum vapor deposition process [23,24], (3) LbL self-assembly of polyelectrolytes or inorganic nanoplatelets with the opposite charges
The results showed that the lamellar structure of α-zirconium phosphate (α-zirconium phosphate (ZrP)) nanoplates generate more tortuous diffusion paths of ions and serves as barriers to prevent vanadium ions migrating though the membrane
Summary
Barrier materials have been widely used in the fields of food preservation, pharmaceuticals and electronic packaging to protect them from detrimental effect of moisture and oxygen in the environment [1]. In order to get PET composite film with super gas barrier properties, several methods have been reported, such as: (1) Melt blending with higher barrier polyamides [21] or nanoplates [22], (2) Deposition of a thin SiOx or metal oxide onto a surface by vacuum vapor deposition process [23,24], (3) LbL self-assembly of polyelectrolytes or inorganic nanoplatelets with the opposite charges. We have reported a covalent layer-by-layer assembly method to fabricate a transparent and super-gas-barrier PET film by PAA based coating [41], in which the thick of coating film was difficult to control These previous works encouraged us to think how to fabricate a nanobrick wall architectures from α-ZrP nanoplates and PAA with the same negative charges for super gas barrier. The transparent and super oxygen barrier films presented in this work have great potential application in packaging fields
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