Research On The Preparation And Static Safety Properties Of Antistatic Bio-based Copolyester

Polyethylene terephthalate?PET?,as one of engineering plastics,is widely used in production and daily life.However,high surface resistivity of PET can accumulate static electricity on its surface and even cause serious safety accident during storage and use.In order to solve electrostatic hazard of PET from the perspective of essential security,this study proposed to use bio-based monomer 2,5-furandicarboxylic acid?FDCA?to replace petroleum-based monomer terephthalic acid?PTA?,and add antistatic components in PET preparation to modify the molecular structure and to achieve permanent antistatic effect.The main results of this research are as follows:?1?In this paper,FDCA,PTA and ethylene glycol?EG?were used as raw materials and tetrabutyl titanate was used as catalyst.A series of poly(2,5-furanediformate-terephthalate?PEFT?were prepared by melting copolymerization.Moreover,the effects of esterification temperature,polycondensation temperature and polycondensation time on product properties were investigated.The results showed that the polymerization degree of PEFT was the highest at esterification temperature of 240?,polycondensation temperature of 260?and polycondensation time of 2h.?2?A series of PEFT,based on above optimal process conditions,were prepared by varying the feed ratio between FDCA and PTA from 0:10 to 10:0.The effects of feed ratio between FDCA and PTA on the structure,thermal stability,water absorption,surface resistivity and mechanical properties of PEFT copolyester were researched.The results confirmed that the synthesis of PEFT copolyester was successfully and its molecular structure was in consistent with expectation,which further proved that this synthetic method was feasible.With the increase of FDCA content,the initial decomposition temperature of PEFT copolyster gradually decreased from 414.2?to 356.9?.The glass transition temperature?T_g?decreased first and then increased.Furthermore,the result of DSC test showed that there was no crystallization peak in cooling stage and no melting peak in heating stage for PEFT copolyester when the FDCA content exceeded 10%.Besides,the tensile strength and flexural strength of PEFT decreased.However,the impact strength increased slightly.The introduction of FDCA into PEFT molecular structure can enhance the water absorption capacity,reduce surface resistivity,improve the antistatic performance and endow excellent antistatic durability and heat resistance for PEFT.?3?The antistatic component of dihydroxyethyl isophthalate-5-Sodium sulfonate?SIPE?and polyethylene glycol?PEG?with different mass fraction was added in PEFT0.1 during polycondensation stage to expolre the effect of antistatic component containing SIPE and PEG respectively on the structure and property for PEFT-SIPE and PEFT-PEG copolyesters,respectively.The results indicated that PEFT prepolymer was polymerized with SIPE segment by forming ester group.The introduction of SIPE can improve the the water absorption of copolyester and reduce the surface resistivity from 10¹²?to 10⁹?.Moreover,the impact strength and bending strength of the copolyester are increased with the increase SIPE mass fraction.The introduction of PEG has a certain effect on increasing the toughness of copolyester.The breaking elongation and impact strength of PEFT-PEG copolyester are significantly improved.At the same time,PEFT-PEG copolyester has higher water absorption rate and lower surface resistivity from 10¹²?to 10⁸?,which evidences that PEFT-PEG has a better antistatic performance.Comparing to PEFT-SIPE copolyester,PEFT-PEG copolyester shows more excellent performance.Furthermore,PEFT-PEG the comprehensive performance is the most remarkable when the amount of PEG is 10%.