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首页> 外文期刊>Journal of Applied Polymer Science >Influence of TiO2 nanoparticles on nonisothermal crystallization of PP in a wide range of cooling rates analyzed by fast scanning DSC
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Influence of TiO2 nanoparticles on nonisothermal crystallization of PP in a wide range of cooling rates analyzed by fast scanning DSC

机译：通过快速扫描DSC分析，TiO2纳米颗粒对多种冷却速率下PP非等温结晶的影响

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The influence of titanium dioxide (TiO2) nanoparticles on the crystallization behavior of polypropylene was investigated by conventional differential scanning calorimetry (DSC) and fast scanning DSC measurements. The data obtained from both methods were estimated for the first time using the Lauritzen-Hoffmann equation to analyze the behavior over a wide cooling range under nonisothermal conditions. This provides more reliable values of nucleation parameters (K-g) and surface free energy (sigma(e)). The variation of the effective energy (E) was determined with the Kissinger method. Regardless of the cooling rate, both K-g and sigma(e) indicate the role of titania as a nucleating agent enhances the crystallization rate. However, the E denotes that TiO2 acts as an obstacle to the mobility of chain segments at cooling rates below 150 degrees C/s, while, in contrast, the presence of titania enhances the chain mobility at cooling rates above 150 degrees C/s. (c) 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43944.
机译：通过常规差示扫描量热法（DSC）和快速扫描DSC测量研究了二氧化钛（TiO2）纳米粒子对聚丙烯结晶行为的影响。首次使用Lauritzen-Hoffmann方程估算了从两种方法获得的数据，以分析非等温条件下较宽冷却范围内的行为。这提供了更可靠的成核参数（K-g）和表面自由能（sigma（e））值。有效能量（E）的变化通过基辛格方法确定。无论冷却速率如何，K-g和sigma（e）都表明二氧化钛作为成核剂的作用提高了结晶速率。但是，E表示在低于150摄氏度/秒的冷却速率下，TiO2会阻碍链段的迁移，而相反，二氧化钛的存在会在高于150摄氏度/秒的冷却速率下增强链的迁移率。 （c）2016 Wiley Periodicals，Inc. J. Appl。 Polym。科学2016，133，43944。

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