Cardanol-modified poly(ethylene 2,6-naphthalate) (PEN) and preparation method thereof

The invention relates to cardanol-modified poly(ethylene 2,6-naphthalate) (PEN) and a preparation method thereof, belonging to the field of high molecular materials and synthesis. The method comprisesthe following steps: taking poly(ethylene 2,6-naphthalate) as a raw material, adding ethylene glycol and cardanol, taking anhydrous zinc acetate as a main catalyst and nano titanium dioxide as an auxiliary catalyst to perform ester exchange and polycondensation reaction, and depressurizing by stages after polycondensation to obtain the cardanol-modified poly(ethylene 2,6-naphthalate). A phenolichydroxyl group in cardanol participates in ester exchange reaction to form an end-capping structure of PEN polyester, unsaturated double bonds generate crosslinking in the process of thermal forming,and the heat resistance of the PEN polyester is improved. By introducing the cardanol, the dosage of expensive PEN can be reduced, the required production time for obtaining PEN polyester with excellent enough performance is sh