碳纳米管-聚酰胺纤维改性邻甲酚醛环氧树脂

多壁碳纳米管(MWCNTs) 经酸化处理后与聚酰胺66（PA66)共纺制备MWCNTs-PA66纳米纤维膜后与邻甲酚醛环氧树脂（o-CFER）进行复合固化，制备了o-CFER/MWCNTs-PA66复合材料，并对其微观结构、力学性能和热性能进行了研究。结果表明，酸化MWCNTs表面引入了含氧基团，使PA66纤维膜的直径增大；o-CFER/MWCNTs-PA66复合材料的冲击强度、拉伸强度随MWCNTs含量的增加先增大后降低；当MWCNTs含量为0.5 %（质量分数，以PA66质量为基准）时，冲击强度和拉伸强度均达到最大值分别为0.29 kJ/m2和1.96 MPa，冲击强度较o-CFER树脂提高了23.2 %，较o-CFER/PA66复合材料提高了16.3 %，拉伸强度较纯o-CFER树脂提高了74 %；MWCNTs-PA66复合纤维膜能够提高o-CFER的耐热性。

Modification of o-Crosel Formaldehyde Epoxy Resin by Carbon Nanotubes-polyamide Fiber

Multi-walled carbon nanotube (MWCNTs) was treated by a concentrated acid, then the acidified carbon nanotubes was co-spun with polyamide (PA66) to prepare MWCNTs-PA66 fiber membrane. An o-CFER/MWCNTs-PA66 composites was prepared through co-cured with the o-cresol formaldehyde epoxy resin (o-CFER), and the microstructure, mechanical and thermal properties were characterized. The diameter of PA66 fiber was increased with the addition of acidified MWCNTs. The impact strength and tensile strength of the composites increased firstly and then decreased with increasing content of carbon nanotubes. When the MWCNTs mass fraction was 0.5 % (based on the mass of PA66), the impact and the tensile strengths reached their maximum value 0.29 kJ/m2 and 1.96 MPa, respectively. The impact strength increased by 23.2 % compared with o-CFER resin, and increased 16.3 % compared with PA66/o-CFER composites. Tensile strength increased by 74 % compared with that of o-CFER resin. The thermal performance was improved when the MWCNTs-PA66 fibers membrane was added.