Authors: Faxue Li Shengli Luo Jie Zhang Jianyong Yu
Publish Date: 2012/11/21
Volume: 113, Issue: 2, Pages: 915-921
Abstract
In this paper studies of the temperature dependence for spherulitic growth of PBST copolyester bearing 70 mol butylene terephthalate units named as PBST70 ranged from 70 to 170 °C were first reported based on the Lauritzen–Hoffman secondary nucleation theory The results showed that maximum spherulitic growth rate of PBST70 was obtained under crystallization temperature of 90 °C and more perfect spherulites were formed via increasing isothermal crystallization temperature by POM measurement The classical regime I → II and regime II → III transitions occurred at the temperatures of 150 and 110 °C respectively using the empirical universal values of U = 6300 J mol−1 and T ∞ = T g − 30 K Moreover the effects of isothermal crystallization temperature on crystal lamellar thickness thermal and tensile properties of PBST70 were systematically investigated by small angle Xray scattering differential scanning calorimeter and strength tester The results indicated that the crystal lamellar thickness increased by increasing isothermal crystallization temperature The endothermic peak shifted to higher temperature and the tensile properties of PBST70 were enhanced under higher isothermal crystallization temperature
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