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首页> 外文期刊>Journal of Applied Polymer Science >Isothermal crystallization behavior and melting characteristics of injection sample of nucleated polypropylene
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Isothermal crystallization behavior and melting characteristics of injection sample of nucleated polypropylene

机译：有核聚丙烯注射样品的等温结晶行为和熔融特性

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摘要

The isothermal crystallization behavior and melting characteristics of pure polypropylene (PP) and PPs nucleated with a phosphate nucleating agent (A) and a sorbitol derivative (D) have been studied by differential scanning calorimetry (DSC). Compared with pure PP, nucleated PPs show a shorter half-times of crystallization. Dependence of crystallization rate of nucleated PP on the crystallization temperature is stronger than that of pure PP at the higher crystallization temperature, whereas the opposite results are obtained at the lower crystallization temperature. Addition of nucleating agent shifts the temperature at the deviation from the baseline of DSC melting curve, T-m(o), and the temperature at the completion of melting, T-m(f), to higher temperatures, indicating that nucleated PPs exhibit a higher perfection of PP crystals. A shoulder peak in the high temperature range of melting peak of nucleated PP and a wider low temperature region in the melting peak of pure PP are observed. Obviously, PP and nucleated PPs form different distribution of crystal perfection in the isothermal crystallization process. According to the half-time of crystallization, nucleating agent A is more effective than D. (C) 2000 John Wiley & Sons, Inc. [References: 26]
机译：通过差示扫描量热法（DSC）研究了纯聚丙烯（PP）和被磷酸盐成核剂（A）和山梨醇衍生物（D）成核的PP的等温结晶行为和熔融特性。与纯聚丙烯相比，有核聚丙烯显示出较短的结晶时间。在较高的结晶温度下，有核PP的结晶速率对结晶温度的依赖性强于纯PP，而在较低的结晶温度下得到相反的结果。添加成核剂会将偏离DSC熔融曲线基线的温度Tm（o）和完成熔融的温度Tm（f）移至更高的温度，这表明成核的PP表现出更高的完美度。 PP晶体。在有核PP的熔融峰的高温范围内观察到肩峰，在纯PP的熔融峰中观察到较宽的低温区。显然，PP和有核PP在等温结晶过程中形成了不同的晶体完美分布。根据结晶时间的一半，成核剂A比D更为有效。（C）2000 John Wiley＆Sons，Inc. [参考：26]

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