Modified Multi-walled Carbon Nanotubes Reinforced Nylon12 Composites

• Main Authors: LIN, YOU-TING, 林祐廷
• Other Authors: Shih, Yeng-Fong
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/shyqp8

碩士 === 朝陽科技大學 === 應用化學系 === 105 === In this study, Nylon (Nylon12, PA12) and multi-walled carbon nanotubes (MWCNTs) were mixed by melt-blending to obtain the nanocomposite material. In order to improve the dispersion of MWCNTs in composites, the MWCNTs were first acid treated by the HNO3 solution to functionalize the carboxylic groups on the surface. Subsequently, these acid treated MWCNTs were reacted with Jeffamine® M2070 Polyetheramine and Polyethylenimine under mild conditions, respectively, to obtain the chemically modified MWCNTs (M-M2070 and M-PEI). The amide groups formed on these chemically modified MWCNTs will enhance the compatibility of MWCNTs and Nylon. The effects of different modification methods on the thermal properties, mechanical properties and electrical resistance of these Nylon12/MWCNTs composites were investigated. The results showed that M-M2070 and M-PEI dispersed in Nylon12 homogeneously, and can improve the mechanical and thermal properties of the composite materials effectively. The tensile strengths of 3 wt% M-M2070 and M-PEI containing composites increased 24.1% and 18.9%, respectively. DMA analysis showed that the storage moduli of 3wt% M-M2070 and M-PEI containing composites increased 48.2% and 29.8%, respectively. TGA analysis showed that pyrolysis temperature of Nylon12 was 412.7℃, and was increased about 43℃ and 36.7℃ by addition of M-M2070 and M-PEI, respectively. Moreover, the surface resistance of Nylon12 was 1.68×〖10〗^14Ω/□, and was decreased to 1.33×〖10〗^5Ω/□ and 4.34×〖10〗^6Ω/□ by addition of 3wt% M-M2070 and M-PEI, respectively. The resistance values of these composites have achieved the level of static dissipation, and can prevent the harm of static electricity.