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采用示差扫描量热、偏光显微镜、X-射线衍射、热重分析及红外光谱分析等手段,研究了以TMB5为代表的取代芳酰胺型β成核剂在不同加工条件下的形态演变规律及其对i PP的β诱导结晶行为的影响.结果表明,TMB5虽然没有明确的熔点,但其原始晶体可以在升温中逐渐熔融并在降温时形成较细的棒状形态;而TMB5对i PP结晶的诱导作用主要和其在i PP熔融体中产生的二次形态密切相关:在保证TMB5分解不明显的温度条件下,混炼温度的提高有利于TMB5在冷却过程中形成更为细小的棒状形态,使PP中β晶的相对含量提高;在混炼之后的二次加工成型过程中,较低的熔融温度和较慢的降温速度有利于β晶含量提高.
The morphological evolution of substituted aromatic amide β-nucleating agents represented by TMB5 under different processing conditions was investigated by differential scanning calorimetry, polarized light microscopy, X-ray diffraction, thermogravimetric analysis and infrared spectroscopy. On the β-induced crystallization behavior of iPP.The results showed that although TMB5 did not have a definite melting point, the original crystals could be gradually melted during the heating and formed a thin rod-like morphology at the time of cooling; while TMB5 induced iPP crystallization The effect is mainly related to the secondary morphology produced in the i PP melt: the increase of the mixing temperature is beneficial to the formation of a finer rod shape during the cooling process of TMB5 under the condition that the temperature of decomposition of TMB5 is not obvious The relative content of β crystal in PP increased. In the secondary processing and forming process after mixing, the lower melting temperature and the slower cooling rate are conducive to the increase of β crystal content.