The effect of CHDM content on the properties of PETG copolyester
Using the copolymerization process,polyethylene terephthalate-1,4-cyclohexanediol ester(PETG)was created with varying concentrations of 1,4-cyclohexanedimethanol(CHDM)content.The impact of CHDM concentration on the rheological,thermal,and mechanical characteristics of copolyesters was investigated through the use of a universal testing machine,differential scanning calorimeter,and rotary rheometer.The find-ings demonstrated that while PETG's ability to crystallize reduced,dynamic viscosity at the same temperature in-creased as CHDM content increased.The copolymer changed from crystalline polymer to amorphous polymer when the CHDM content reached 20%.The tensile strength of PETG copolyester increases as the CHDM content increa-ses,whereas the transmittance increases,the haze decreases,and the elastic modulus and elongation at break de-crease.
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