Non-isothermal crystallization kinetics of CHDA modified PBT
1,4-cyclohexanedicarboxylic acid(CHDA)-modified polybutylene terephthalate(PBT)copolyester was prepared by direct esterification using purified terephthalic acid,1,4-butanediol and 1,4-cyclohexanedicarboxylic acid(CHDA)as raw mate-rials.The crystallization properties of the CHDA-modified PBT copolyester were studied by differential scanning calorimetry.The non-isothermal crystallization kinetics of the CHDA-modified PBT was analyzed by Jeziorny method.The results showed that the non-isothermal crystallization activation energy of the CHDA modified PBT copolyester decreased from 180.389 kJ/mol to 112.829 kJ/mol with a reduction of 37.45%as the mass fraction of CHDA increased from 0 to 20%;the initial crystallization temperature and crystallization temperature of the CHDA modified PBT copolyester decreased and the semi crystallization time de-creased as the cooling rate(ϕ)increased;and the non-isothermal crystallization rate of the CHDA modified PBT copolyester slowed down and the crystallization capacity decreased with the increase of CHDA content at the sameϕ,indicating that the addi-tion of CHDA was not conducive to the crystallization of PBT.
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