关键词: 聚丁二酸丁二醇酯, 聚乙二醇硬脂酸酯, 共混物, 结晶行为, 非等温结晶动力学, 莫志深方程

Abstract: Two polymer blends were prepared by solution blending with poly(butylene succinate) (PBS) and poly(ethylene glycol) stearate (PEOST) as raw materials. The PEOST mass fraction of one polymer blends was 10% (POS-10) and the other was 30% (POS-30). The non-isothermal crystallization behaviors of the two materials were studied by differential scanning calorimetry (DSC). The non-isothermal crystallization kinetics of PBS were analyzed by Mo Zhishen (Mo) method. And the crystallization activation energy of PBS was calculated by Kissinger method and Friedman method. The blends were also characterized by Fourier transform infrared spectrum (FTIR) and Polarized optical microscopy (POM). The results showed that influenced by the first crystallization of PBS, no PEOST crystal peak appeared in the DSC cooling curve of POS-10, while double crystal peaks of PEOST appeared in POS-30 at lower cooling rate. However, in the corresponding heating DSC curves, the melting peak of PEOST appeared in all two samples. The melting temperature (T_m) and melting enthalpy (△H_m) of PEOST in POS-30 were greater than those of POS-10. Higher contents of PEOST were helpful to form PBS crystallization. With increasing PEOST contents, the crystallization peak temperature and crystallization enthalpy(△H_c) of PBS increased, while the width of crystal half slit(D) decreased. However, PEOST usages had little effect on T_m and △H_m of PBS. With increasing cooling rate, the D of PBS increased, but that of PEOST reduced. The cooling rate had little effect on the T_m of PBS, while the T_m of PEOST decreased slightly. The Mo equations well described the non-isothermal crystallization kinetics of PBS in blends. The absolute values of the activation energy of the PBS in POS-30 were greater than those of POS-10. The infrared response peaks at 1109cm^-1 and 841cm^-1 attributed to PEOST crystals appeared in the IR spectra of POS-30,but not emerged in POS-10.

Key words: poly(butylene succinate), poly(ethylene glycol) stearate, blends, crystallization behavior, non isothermal crystallization kinetic, Mo Zhishen equation