Colored post-consumer polyester textiles were first alcoholized by ethylene glycol (EG),and the alcohol-ysis were then transesterified with methanol (MeOH ) .The transesterification products were decolorized and puri-fied to prepare colorless dimethyl terephthalate (DMT).It is then exchanged with 1,4-butanediol (BDO) to obtain colorless dihydroxybutanediol terephthalate (BHBT ) .And then,the regenerated colorless clr-PBCT copolyester was prepared by polycondensation of BHBT and dimethyl butylene carbonate (BMBC) which synthesized by trans-esterification of dimethyl carbonate (DMC) and 1,4-butanediol (BDO).The melting rheological properties of clr-PBCT60 and clr-PBCT 70 were tested by using capillary rheometer.The results show that,the melt of the two sam-ples exhibited shear thinning phenomenon,exhibiting non Newtonian fluid flow characteristics;When the shear rate-was less than 1100 s-1,the spinnability of clr-PBCT60 was better than that of clr-PBCT70 .The non-Newtonian ex-ponents (n) of both samples were less than 1 and increased with the increase of testing temperature.Its viscous flow activation energy (△Eη) decreased with the increase of shear rate,and the value of clr-PBCT60 were significantly lower than that of clr-PBCT70 sample.When the shear rate was less than 1100 s-1,the melt structural viscosity in-dex of clr-PBCT60 was lower than that of clr-PBCT70,and the opposite was true when the shear rate increased.
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