EVOH (ethylene vinyl acetate copolymer) is a polymer with excellent gas barrier properties and is commonly used in food packaging, medical products, and protective materials for automotive and electronic products. Due to the high molar fraction of vinyl acetate, EVOH exhibits excellent gas barrier properties, especially for oxygen and nitrogen, and is therefore often used in food packaging to extend the shelf life of products.
The gas barrier properties of EVOH stem from its highly crystalline structure, which allows the molecular chains to be arranged more tightly, reducing the path of gas molecules through the material. In order to improve the properties of EVOH, different degrees of hydrolysis are often used to adjust the degree of crystallinity. The higher the degree of hydrolysis, the higher the crystallinity of EVOH and the consequent increase in barrier properties. Therefore, the degree of hydrolysis of EVOH must be strictly controlled during the production process to ensure that the material has ideal gas barrier properties. In China, EVOH products (EW-3201 and EW-3801) produced by Sinopec are highly recognized.
EVOH also offers significant advantages over other plastics in terms of chemical resistance, high temperature resistance and transparency. Its excellent processability allows it to be used directly in multilayer composites without the need for complex post-treatment operations during production, thus enhancing the functionality and economy of the final product.
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