Isothermal melt crystallization kinetics, melting behavior, and spherulitic morphology of novel biobased poly(hexylene oxalate)
Isothermal melt crystallization kinetics, melting behavior, and spherulitic morphology of novel biobased poly(hexylene oxalate)
复制标题
新型生物基聚草酸己二醇酯的等温熔融结晶动力学、熔融行为和球晶形态
DOI：
10.1039/c5ra22486a
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发表时间：
2015-12
期刊：
影响因子：
3.9
通讯作者：
Qiu Zhaobin
中科院分区：
文献类型：
--
作者：
Yan Rui;Qiu Zhaobin
采用差示扫描量热法和偏光显微镜研究了一种新型生物基半结晶聚酯聚草酸亚己酯（PHO）的等温熔融结晶动力学、熔融行为和球晶形貌。在所研究的Tc范围内，PHO的等温熔融结晶动力学可用Avrami方程描述。随着Tc的增加，PHO的结晶速率降低，但结晶机理保持不变。PHO的双熔融吸热，这是由熔化，再结晶和重熔机制解释。通过Hoffman-Weeks方程确定PHO的平衡熔点为86.6 ℃。根据不同的Tc，PHO表现出不同的球晶形态。带状球晶观察到在一个很宽的范围内的Tc，而且，带间距增加，随着Tc的增加。PHO球晶的球晶生长速率随Tc的增加而降低;此外，PHO球晶在约50 ℃下表现出从制度II到制度III的结晶制度过渡，根据二次成核理论。
The isothermal melt crystallization kinetics, melting behavior, and spherulitic morphology of poly(hexylene oxalate) (PHO), a novel semicrystalline polyester derived from biobased resources, were investigated in detail with differential scanning calorimetry and polarizing optical microscopy in a wide crystallization temperature (Tc) range. The isothermal melt crystallization kinetics of PHO was well described by the Avrami equation in the investigated Tc range. With increasing Tc, the crystallization rate of PHO was reduced; however, the crystallization mechanism remained unchanged. Double melting endotherms were observed for PHO, which was explained by the melting, recrystallization, and remelting mechanism. Through the Hoffman-Weeks equation, the equilibrium melting point of PHO was determined to be 86.6 degrees C. Depending on Tc, PHO exhibited different spherulitic morphologies. Banded spherulites were observed in a wide range of Tc; moreover, the band spacing increased with increasing Tc. The spherulitic growth rates of the PHO spherulites decreased with increasing Tc; furthermore, the PHO spherulites exhibited a crystallization regime transition from regime II to regime III at about 50 degrees C, according to the secondary nucleation theory.
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影响因子：
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影响因子：
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