Improvements of Thermal, Mechanical, and Water-Resistance Properties of Polybenzoxazine/Boron Carbide Nanocomposites

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• 作者：Noureddine Ramdani ; Mehdi Derradji ; Jun Wang ; El-Oualid Mokhnache ; Wen-Bin Liu
• 刊名：JOM Journal of the Minerals, Metals and Materials Society
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：68
• 期：9
• 页码：2533-2542
• 全文大小：1,277 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Materials Science
  Metallic Materials
  Nanotechnology
  Crystallography
  
• 出版者：Springer Boston
• ISSN：1543-1851
• 卷排序：68

文摘

Novel kinds of nanocomposites based on bisphenol A-aniline based polybenzoxazine matrix P(BA-a) and 0 wt.%–20 wt.% boron carbide (B₄C) nanoparticles were produced and their properties were evaluated in terms of the nano-B₄C content. The thermal conductivity of the P(BA-a) matrix was improved approximately three times from 0.18 W/m K to 0.86 W/m K at 20 wt.% nano-B₄C loading, while its coefficient of thermal expansion (CTE) was deceased by 47% with the same nanofiller content. The microhardness properties were significantly improved by adding the B₄C nanoparticles. At 20 wt.% of nano-B₄C content, dynamic mechanical analysis (DMA) revealed a marked increase in the storage modulus and the glass transition temperature (T_g) of the nanocomposites, reaching 3.9 GPa and 204°C, respectively. Hot water uptake tests showed that the water-resistance of the polybenzoxazine matrix was increased by filling with nano-B₄C nano-filler. The morphological analysis reflected that the improvements obtained in the mechanical and thermal properties are related to the uniform dispersion of the nano-B₄C particles and their strong adhesion to the P(BA-a) matrix.