多壁碳纳米管-环氧树脂纳米复合材料的γ-射线固化行为

γ-Ray Radiation Curing Behavior of Multi-walled Carbon Nanotubes-Epoxy Nanocomposites

通过γ-射线辐射固化制备了多壁碳纳米管-环氧树脂复合材料。采用索氏提取法、傅里叶变换红外光谱(FT-IR)和差示扫描量热法(DSC)测试了多壁碳纳米管-环氧树脂复合体系的凝胶含量、转化率及热流曲线等固化动力学参数。采用扫描电子显微镜(SEM)表征了复合材料的微观组织。结果表明:通过γ-射线辐射固化的复合体系的凝胶含量随着辐射剂量、光引发剂含量的增加而增加;由于多壁碳纳米管对活性反应中心的影响,转化率随着多壁碳纳米管加入量的增加呈先下降,后增加的趋势。复合体系中多壁碳纳米管含量较高时易发生团聚,团聚会对复合体系的固化行为产生一定影响。

Multi-walled carbon nanotubes （MWNTs）-epoxy nanocomposites were prepared for the first time by γ-ray radiation curing. The gel contents, the conversion rates and heat flow curves were determined by the Soxhlet extraction method, Fourier transform infrared spectrum （FT-IR） and differential scanning calorimetry （DSC） technique, respectively. Scanning electron microscope （SEM） was used to observe the microstructure of the composites. The gel content of the composites prepared by γ-ray radiation curing increased with the increase of radiation dosages and photoinitiator concentration. Because of the effect of MWNTs on the reactive centers, the conversion tended to decrease in the beginning and then increase with the increase in the amount of additional MWNTs. Higher amount of MWNTs may lead to aggregation in the system, which may cause the curing behavior to deviate from that of neat epoxy.