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Abstract
Polyacrylonitrile (PAN) grafted amino-functionalized multi walled carbon nanotubes (amino-MWCNTs) were synthesized by in situ polymerization under aqueous solvent. The grafted MWCNT/PAN nascent composite fibers were prepared by the wet spinning method. Fourier transform infrared spectroscopy and Raman spectroscopy indicated that the amino-MWCNTs and PAN macromolecular chains had interfacial interactions and formed chemical bonds. The grafting content of the PAN polymer on the amino-MWCNTs was up to 73.2% by thermo gravimetric analysis. The incorporation of the grafted MWCNTs improved the degree of crystallization and crystal size of PAN nascent fibers, and changed the thermal properties during exothermic processing in an air atmosphere. Morphology analysis and testing of mechanical properties showed that the grafted MWCNT/PAN nascent composite fibers with a more uniform diameter distribution and larger diameter had higher tensile strength and tensile modulus than the control PAN nascent fibers.
Highlights
Owing to their unique structure and properties, such as high strength, low mass density, and large aspect ratio, carbon nanotubes (CNTs) have been used as an ideal reinforcing agent in composites [1,2].CNTs are aggregated because of a strong van der Waals force between them and large specific surface area, which makes CNTs difficult to disperse into most solvents or polymer matrices.it is difficult for strong interfacial interactions to form between the inert surface of the multi wall carbon nanotubes (MWCNTs) and the polymer matrix, which limits the excellent properties of the MWCNTs
The PAN polymer synthesized by an AN monomer under initiator, was grafted onto the surface of the amino‐MWCNTs by in situ polymerization
The PAN polymer synthesized by an AN monomer under initiator, was grafted onto the surface of the amino-MWCNTs by in situ polymerization
Summary
CNTs are aggregated because of a strong van der Waals force between them and large specific surface area, which makes CNTs difficult to disperse into most solvents or polymer matrices. It is difficult for strong interfacial interactions to form between the inert surface of the multi wall carbon nanotubes (MWCNTs) and the polymer matrix, which limits the excellent properties of the MWCNTs. various non-covalent and covalent methods are used to modify the surface of CNTs for improving the dispersion and interfacial interactions. Katti et al [6]
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