Synthesis, curing behavior, and thermal properties of fluorene-based benzoxazine-endcapped copoly(ether ketone ketone)s

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• 作者：Hui Wang ; Jun Wang ; Tian-tian Feng…
• 关键词：Fluorene ; based polybenzoxazines ; Copoly(ether ketone ketone) ; Polymerization behavior ; Thermal properties
• 刊名：Journal of Thermal Analysis and Calorimetry
• 出版年：2015
• 出版时间：March 2015
• 年：2015
• 卷：119
• 期：3
• 页码：1913-1921
• 全文大小：1,462 KB
• 参考文献：1. Ishida, H, Agag, T (2011) Handbook of benzoxazine resins. Elsevier, Oxford
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  17. Santhosh Kumar, KS, Reghunadhan Nair, CP, Ninan, KN (2006) Rheokinetic investigations on the thermal polymerizati
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Sciences
  Polymer Sciences
  Physical Chemistry
  Inorganic Chemistry
  Measurement Science and Instrumentation
  
• 出版者：Akad茅miai Kiad贸, co-published with Springer Science+Business Media B.V., Formerly Kluwer Academic
• ISSN：1572-8943

文摘

A series of fluorene-based benzoxazine-endcapped copoly(ether ketone ketone)s (co-PEKKs) were successfully synthesized, in which the co-PEKKs were prepared with different molar ratios of 2,7-dihydroxy-9-fluorenone to bisphenol-A. The obtained phenol-ended co-PEKKs reacted with formaldehyde and n-butylamine to yield the benzoxazine-endcapped co-PEKKs (B-PEKKs). The structure of these oligomers was studied by Fourier transform infrared spectroscopy and 1H nuclear magnetic resonance spectroscopy, and the molecular mass of these phenol-ended co-PEKKs was detected by gel permeation chromatography. The thermal behaviors of these B-PEKKs were determined by differential scanning calorimetry. In addition, the thermal and dynamic mechanical properties of the polymer films were investigated by thermogravimetric analysis and dynamic mechanical analysis. The results indicate that the incorporation of co-PEKKs within the benzoxazine backbone considerably improves the toughness of the fluorene-containing polybenzoxazines without much sacrifice of their thermal properties. Furthermore, as the content of 2,7-dihydroxy-9-fluorenone increases, the T 5 values decrease, while the T g values and char yields of the prepared polymers increase to reach their highest values at 256?°C and 64?%, respectively.