摘要
The nonisothermal crystallization of poly(butylene dodecanedioate) was studied by differential scanning calorimetry,crystals of polyesters were observed through polarized optical microscope,and an Avrami method was used to analyze the kinetics of nonisothermal crystallization.The results showed that the crystallization temperature decreased slowly with an increase in the cooling rate.Furthermore,secondary nucleation was observed in the process of PBDD nonisothermal crystallization,and the Avrami exponential values n of PBDD indicated that the mechanism of crystallization was a tridimensional growth with heterogeneous and homogeneous nucleation.Meanwhile,the Avrami values n of P(BDD-co-BT)-20 is 1,which indicated that their mechanism of crystallization was a one-dimensional growth with heterogencous nucleation.Crystallization activation energies implied that it is easier to crystallize for copolyester.From the observed results of spherulites,it can be concluded that the size of spherulites decreases with increasing the content of terephthalic acid.
The nonisothermal crystallization of poly (butylene dodecanedioate) was studied by differential scanning calorimetry,crystals of polyesters were observed through polarized optical microscope, and an Avrami method was used to analyze the kinetics of nonisothermal crystallization. The results showed that the crystallization temperature decreased slowly with an increase in the cooling rate. Furthermore, secondary nucleation was observed in the process of PBDD nonisothermal crystallization, and the Avrami exponential values n of PBDD indicated that the mechanism of crystallization was a tridimensional growth with heterogeneous and homogeneous nucleation. Meanwhile, the Avrami values n of P(BDD-co-BT)-20 is 1, which indicated that their mechanism of crystallization was a one-dimensional growth with heterogeneous nucleation. Crystallization activation energies implied that it is easier to crystallize for copolyester. From the observed results of spherulites, it can be concluded that the size of spherulites decreases with increasing the content of terephthalic acid.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2004年第3期429-433,共5页
Acta Polymerica Sinica
基金
河南省自然科学重点基金项目 (基金号 0 1110 40 10 0 )
关键词
聚十二烷二元酸丁二酯
共聚酯
结晶动力学
直接熔融缩聚法
poly(butylene dodecanedioate)
copolyester
nonisothermal crystallization
kinetics of crystallization
spherulites
