酸化处理多壁碳纳米管/氰酸酯树脂复合材料性能

采用酸化处理的多壁碳纳米管（MWCNTs）增强双酚A型氰酸酯-酚醛型氰酸酯（BCE-NCE）树脂。通过SEM、TEM对MWCNTs/BCE-NCE树脂复合材料微观结构进行表征，利用DSC、DMA和TG/DTA对MWCNTs/BCE-NCE树脂复合材料热性能进行研究，采用电子拉力机对MWCNTs/BCE-NCE树脂复合材料力学性能进行测试，采用谐振腔法对MWCNTs/BCE-NCE树脂复合材料介电性能进行测试。结果表明，混酸处理过的MWCNTs在BCE-NCE树脂基体中的分散效果较好。MWCNTs对BCE-NCE树脂热力学性能影响不大，当MWCNTs添加量为0.8wt%时，BCE-NCE树脂玻璃化转变温度（T_g）从298℃下降到285℃，但仍维持较高水平。当MWCNTs添加量为0.6wt%时，MWCNTs/BCE-NCE树脂复合材料冲击强度为11.40 kJ/m²，提高了40.7%。MWCNTs的加入增加了BCE-NCE树脂介电常数和介电损耗，当MWCNTs添加量为0.8wt%、频率为1 GHz时，MWCNTs/BCE-NCE树脂复合材料介电常数为5.1，介电损耗为0.032。因此，MWCNTs/BCE-NCE树脂复合材料未来可在耐高温复合材料和电子等行业应用。

Properties of acid treated multi-walled carbon nanotubes/cyanate ester resin composites

Multi-walled carbon nanotubes (MWCNTs) treated with mixed acids were used to reinforce the bisphenol A cyanate ester-novolac cyanate ester(BCE-NCE) resin. The microstructure of the MWCNTs/BCE-NCE composites was characterized by SEM and TEM. The thermal performances of the MWCNTs/BCE-NCE composites were investigated by DSC, DMA and TG/DTA. The mechanical properties of the MWCNTs/BCE-NCE composites were investigated by electronic tension machine. The dielectric properties of the MWCNTs/BCE-NCE resin were investigated by cavity resonator method. The results show that the dispersion properties of the treated MWCNTs in the BCE-NCE resin matrix are improved compared with the untreated analogue. MWCNTs have little effect on the BCE-NCE resin thermodynamic properties. Upon addition of 0.8wt% MWCNTs to the BCE-NCE resin, the glass transition temperature(T_g) of the cured MWCNTs/BCE-NCE composites changes from 298℃ to 285℃, maintaining a relatively high value. The BCE-NCE resin impact strength of 0.6wt% MWCNTs is 11.40 kJ/m², and the toughness increases by 40.7%. The dielectric constant and dielectric loss of MWCNTs/BCE-NCE composites increase obviously. Upon addition of 0.8wt% of MWCNTs to the resin, the dielectric constant is 5.1 and dielectric loss is 0.032 under 1 GHz frequency. Therefore, the MWCNTs/BCE-NCE composites may be suitable for future applications involving high performance composites and electronic industry.