表面复合纳米SiO_2和碳纳米管玻璃纤维增强尼龙6的结构与性能

利用静电相互作用在玻璃纤维(GF)表面分别复合纳米二氧化硅(SiO2)和多壁碳纳米管(MWNTs),制备了GF-SiO2、GF-MWNTs复合增强体,并通过转矩流变仪制备了尼龙6(PA6)/GF-SiO2和尼龙6(PA6)/GF-MWNTs复合材料.利用扫描电子显微镜(SEM),示差扫描量热仪(DSC),热机械分析仪(DMA)等手段研究了复合材料的微观结构、热学及力学性能.结果表明,静电复合的方法可以使纳米二氧化硅(nano-SiO2)、多壁碳纳米管(MWNTs)在GF表面达到均匀吸附,复合增强体能加快尼龙6的结晶速度,并使材料的玻璃化温度、动态模量、拉伸强度、结晶温度等明显提高,其中GF-MWNTs对复合材料性能的提高最明显,拉伸强度提升了21%,模量提高了28%.

STRUCTURE AND PERPORMANCE OF POLYAMIDE 6 COMPOSITES REINFORCED BY GLASS FIBER COMPOUNDED WITH NANO-SiO2 OR CANBON NANOTUBES

The electrostatic compounding technology was used to prepare glass fiber-SiO2(GF-SiO2) and glass fiber-MWNTs ( GF-MWNTs ) reinforcing fibers. Polyamide 6 ( PA6 ) /GF-SiO2 and PA 6 /GF-MWNTs composites were prepared by using a torque rheometer. The effects of compounded fibers on the mechanical, thermal properties and crystallization behavior of PA 6 were investigated via scanning electron microscope (SEM),differential scanning calorimeter (DSC),thermal mechanical analyzer (DMA) and tensile test. SEM photographs show that nano-SiO2 and MWNTs-COOH were uniformly dispersed on the surfaces of glass fibers. The interfacial adhesion between PA6 matrix and GF-SiO2,GF-MWNTs are better than that between PA6 and untreated GF due to the interaction such as hydrogen /covalent bonds formed among the functional groups of nano-particles and PA6 chains. Addition of GF and compounded fiber increased the crystallization temperature of PA 6,which indicated that GF and nanoparticles played the role of nucleating agent of PA 6. It was revealed that the PA 6 /compounded fiber composites had higher tensile strength and dynamic storage modulus than those of PA 6 /untreated-GF composites,especially the PA6 /GF-MWNTs composites exhibited improved mechanical properties with 21% and 28% increases in tensile strength and dynamic storage modulus respectively.