| 摘要 |
PURPOSE: A linear ethylene-vinyl acetate alcohol polymer and a preparation method thereof are provided, which improves gas barrier property and crystallinity of EVAL(ethylene-vinyl acetate alcohol) polymer which is used in food casing, fuel tank of automobile, and toy. CONSTITUTION: A linear ethylene-vinyl acetate alcohol polymer is formed through ring-opening metathesis polymerization, hydrogenation and hydrolysis and through using cyclic monomer as material comprising ethylene and vinyl alcohol. The monomer is octagonal cyclic monomer (from formula 1) comprising an ethylene and vinyl alcohol in a ratio of 3:1. A preparation method of catalyst comprises the following steps: (i) adding carbon tetra-chloride where 2,6-di- phenylphenol is dissolved to the solution where tungsten hexa chloride is dissolved in carbon tetra-chloride; (ii) after performing a flux, removing carbon tetra-chloride under vacuum condition; (iii) washing the obtained solid matter with ethanol, pentane, and performing a re-crystallization by using methylene chloride/ethanol; (iv) washing with ethanol and pentane again and drying under vacuum condition.
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