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首页> 外文期刊>Journal of Applied Polymer Science >CRYSTALLIZATION BEHAVIOR OF POLY(ETHER ETHER KETONE KETONE)
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CRYSTALLIZATION BEHAVIOR OF POLY(ETHER ETHER KETONE KETONE)

机译：聚醚醚酮酮的结晶行为

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The melting behavior of semicrystalline poly(ether ether ketone ketone) (PEEKK) has been studied by differential scanning calorimetry (DSC). When PEEKK is annealed from the amorphous state, it usually shows two melting peaks. The upper melting peaks arise first, and the lower melting peaks are developed later. The upper melting peaks shown in the DSC thermogram are the combination (addition) of three parts: initial crystal formed before scanning; reorganization; and melting-recrystallization of lower melting peaks in the DSC scanning period. In the study of isothermal crystallization kinetics, the Avrami equation was used to analyze the primary process of the isothermal crystallization; the Avrami constant, n, is about 2 for PEEKK from the melt and 1.5 for PEEKK from the glass state. According to the Lauritzen-Hoffman equation, the kinetic parameter of PEEKK from the melt is 851.5 K; the crystallization kinetic parameter of PEEKK is higher than that of PEEK, and suggests the crystallizability of PEEKK is less than that of PEEK. The study of crystallization on PEEKK under nonisothermal conditions is also reported for cooling rates from 2.5 degrees C/min to 40 degrees C/min, and the nonisothermal condition was studied by Mandelkern analysis. The results show the nonisothermal crystallization is different from the isothermal crystallization. (C) 1996 John Wiley & Sons, Inc. [References: 27]
机译：通过差示扫描量热法（DSC）研究了半结晶聚醚醚酮酮（PEEKK）的熔融行为。当PEEKK从非晶态退火后，通常会显示两个熔融峰。较高的熔融峰首先出现，而较低的熔融峰随后出现。 DSC热分析图中显示的较高熔解峰是三个部分的组合（加和）：扫描前形成的初始晶体;和重组;在DSC扫描期间较低熔点的熔融重结晶。在等温结晶动力学研究中，使用Avrami方程分析等温结晶的主要过程。对于熔体的PEEKK，Avrami常数n约为2，对于玻璃态的PEEKK，Avrami常数约为1.5。根据Lauritzen-Hoffman方程，来自熔体的PEEKK的动力学参数为851.5 K; PEEKK的结晶动力学参数高于PEEK，表明PEEKK的结晶性低于PEEK。还报道了在非等温条件下在PEEKK上从2.5摄氏度/分钟到40摄氏度/分钟的冷却速率进行结晶的研究，并通过Mandelkern分析研究了非等温条件。结果表明，非等温结晶不同于等温结晶。 （C）1996 John Wiley＆Sons，Inc. [参考：27]

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