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首页> 外文期刊>RSC Advances >Isothermal melt crystallization kinetics, melting behavior, and spherulitic morphology of novel biobased poly(hexylene oxalate)
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Isothermal melt crystallization kinetics, melting behavior, and spherulitic morphology of novel biobased poly(hexylene oxalate)

机译：等温熔体结晶动力学，熔化行为和新型生物化聚（己烷酸盐）的球晶形态

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摘要

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.
机译：使用差分扫描量热法研究了聚（己二酸己酸盐）（PHO）（PHO），衍生自生物化资源的新型半结晶聚酯，偏振光学显微镜（TC）详细研究了新型半结晶聚酯的等温熔融结晶动力学，熔化的行为和熔融性的形态。 ） 范围。通过研究的TC范围内的AVRAMI方程很好地描述了PHO的等温熔体结晶动力学。随着TC的增加，PHO的结晶速率降低;然而，结晶机制保持不变。观察到PHO的双重熔化吸收，这是通过熔融，重结晶和重熔机制来解释的。通过霍夫曼周等式，根据TC，PHO的平衡熔点确定为86.6℃.PHO表现出不同的球晶形态。在各种TC中观察到带状球菌;此外，频带间距随着TC的增加而增加。随着TC的增加，Pho球晶的球晶生长速率降低;此外，根据次要成核理论，PHO球晶素从制度II中从左右III的结晶制度转变为约50℃。

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  • 来源
    《RSC Advances》 |2015年第126期|共8页
  • 作者

    Yan Rui; Qiu Zhaobin;

  • 作者单位

    Beijing Univ Chem Technol State Key Lab Chem Resource Engn MOE Key Lab Carbon Fiber &

    Funct Polymers Beijing 100029 Peoples R China;

    Beijing Univ Chem Technol State Key Lab Chem Resource Engn MOE Key Lab Carbon Fiber &

    Funct Polymers Beijing 100029 Peoples R China;

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  • 正文语种 eng
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