Preparation of PEFT polyester and retention performance of PEFT nanofiltration membrane
In order to solve the problems of slow degradation of polyethylene terephthalate(PET)material products after use and poor toughness of polyethylene 2,5-furandicarboxylate(PE F),a novel block copolyester poly-2,5-furandi-carboxylic acid-ethylene glycol-co-terephthalate(PEFT)is developed,which can be synthesized by exchange-melt polycondensation,and PEFT possesses thermodynamic properties comparable to PEF.The structure of polyester is characterized by FTIR and NMR,and the results show that PEFT polyester is successfully prepared by this method.Thermal properties of PEFT polyester were characterized by TG,DSC,and UV irradiation,the results show that PEFT polyester has excellent thermal properties and can be rapidly degraded under UV light ir-radiation.In addition,PEFT polyester materials are prepared by non-solvent-induced phase separation(NIPS)to prepare PEFT nanofiltration membranes with different conce-ntrations of casting liquids,which are used for the retention of dye ions and metal salt solutions,and then the surface roughness,water contact angle,chargeability,retention capacity of dye ions and metal salt ions are tested.The results show that PEFT nanofiltration membrane has good retention performance for methyl blue(Mr=799.8)dye and acid fuchsin(Mr=585.4)dye.the highest retention rate can reach 99％and 87.7％,and the nanofiltration membrane still has high stability after long-term circulation.The retention performance of metal salt(MgSO4)solution is not good,and the maximum retention rate dese not exceed 35％.Overall,the PEFT nanofiltration membrane showed excellent performance in dye retention.
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