Synthesis and properties of poly(1,4-cyclohexanedimethanol terephthalate-co-isosorbide terephthalate)
This paper used terephthalic acid(PTA),isosorbide(ISB),1,4-cyclohexanedimethanol(CHDM),and ethylene glycol(EG)as raw materials,and proposed the synthesis method of ethylene glycol and its esterification as intermediate products in order to improve the glass transition temperature of PET res-in and the heat resistance of its products.Direct melt polycondensation was used to create poly(1,4-cyclohex-anedimethanol terephthalate-co-isosorbide terephthalate)(PCIT)copolyesters.We looked into how the feed ratio of ISB to CHDM affected the product properties and reaction rates of esterification and polycondensation.The me-chanical characteristics of copolyesters were characterized and their thermal characteristics and viscosity chan-ges during simulated processing were investigated using differential scanning calorimetry(DSC).The findings indi-cated that the esterification apparent activation energy increased,the esterification and polycondensation reaction rate slowed down,the copolyester's b value increased,the glass transition temperature Tg increased,the ther-mal degradation rate accelerated,and the mechanical properties decreased with an increase in ISB content and a decrease in CHDM content.Nevertheless,the mechanical properties of copolyester declined when its ISB content rose to 0.5%.Compared to PEIT copolyesters,the notch impact strength was significantly higher at o-ver 130 J/m and the fracture elongation was over 100%.
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