Nonisothermal crystallization behavior of poly(butylene adipate-co-terephthalate)(PBAT) synthesized via direct esterification and polycondensation reactions was investigated by the differential scanning calorimetry(DS...Nonisothermal crystallization behavior of poly(butylene adipate-co-terephthalate)(PBAT) synthesized via direct esterification and polycondensation reactions was investigated by the differential scanning calorimetry(DSC).The Avrami equation modified by Jeziorny and the Z.S.Mo equation were employed to describe the non-isothermal crystallization kinetics of copolyester samples.The test results showed that the Avrami equation was successful in describing nonisothermal crystallization process of PBAT copolyesters.PBAT copolyester could give birth to secondary crystallization.The crystallization parameter(Zc) increased with an increasing cooling rate and the Avrami exponent(n) was around 2.3.For a given cooling rate,the value of Zc demonstrated a sagging trend with an increase in adipic acid(AA) content.The equation proposed by Z.S.Mo was successful in describing the nonisothermal crystallization kinetics of PBAT copolyesters.展开更多
Binary alloy samples consisting of poly（phenylene sulfide） （PPS）/poly（ethylene terephthalate-co-cyclohexane 1,4-dimethanol terephthalate） （PETG） blend were prepared by the melt blending technology using a twin...Binary alloy samples consisting of poly（phenylene sulfide） （PPS）/poly（ethylene terephthalate-co-cyclohexane 1,4-dimethanol terephthalate） （PETG） blend were prepared by the melt blending technology using a twin-screw extruder. The nonisothermal crystallization kinetics of binary alloys made of poly（phenylene sulfide） （PPS） and poly（ethyleneco-cyclohexane 1,4-dimethanol terephthalate） （PETG） was studied by the differential scanning calorimetry （DSC） at different cooling rates. The test results revealed that the addition of PETG could shift the crystallization temperature of PPS toward the high-temperature direction. The nonisothermal crystallization kinetic parameters of the PPS/PETG alloy samples were calculated by the methods proposed by Avrami and Mo. Test results demonstrated that the PPS/PETG alloy could give birth to apparent secondary crystallization. The value of Avrami exponent was lower relatively, while Mo＇s method was more suited to the nonisothermal crystallization process of the PPS/PETG alloy.展开更多
文摘Nonisothermal crystallization behavior of poly(butylene adipate-co-terephthalate)(PBAT) synthesized via direct esterification and polycondensation reactions was investigated by the differential scanning calorimetry(DSC).The Avrami equation modified by Jeziorny and the Z.S.Mo equation were employed to describe the non-isothermal crystallization kinetics of copolyester samples.The test results showed that the Avrami equation was successful in describing nonisothermal crystallization process of PBAT copolyesters.PBAT copolyester could give birth to secondary crystallization.The crystallization parameter(Zc) increased with an increasing cooling rate and the Avrami exponent(n) was around 2.3.For a given cooling rate,the value of Zc demonstrated a sagging trend with an increase in adipic acid(AA) content.The equation proposed by Z.S.Mo was successful in describing the nonisothermal crystallization kinetics of PBAT copolyesters.
文摘Binary alloy samples consisting of poly（phenylene sulfide） （PPS）/poly（ethylene terephthalate-co-cyclohexane 1,4-dimethanol terephthalate） （PETG） blend were prepared by the melt blending technology using a twin-screw extruder. The nonisothermal crystallization kinetics of binary alloys made of poly（phenylene sulfide） （PPS） and poly（ethyleneco-cyclohexane 1,4-dimethanol terephthalate） （PETG） was studied by the differential scanning calorimetry （DSC） at different cooling rates. The test results revealed that the addition of PETG could shift the crystallization temperature of PPS toward the high-temperature direction. The nonisothermal crystallization kinetic parameters of the PPS/PETG alloy samples were calculated by the methods proposed by Avrami and Mo. Test results demonstrated that the PPS/PETG alloy could give birth to apparent secondary crystallization. The value of Avrami exponent was lower relatively, while Mo＇s method was more suited to the nonisothermal crystallization process of the PPS/PETG alloy.
