Journal
MATERIALS CHEMISTRY AND PHYSICS
Volume 271, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2021.124898
Keywords
Polyamide 66; Carbon nanotubes; Graphene oxide; Nanocomposite fibers; Synergistic reinforcing effect
Categories
Funding
- National Key Research and Development Program of China [2016YFB0303000]
- New Materials Research Key Program of Tianjin [16ZXCLGX00090]
- Tianjin Postgraduate Research and Innovation Project Funding [2019YJSB193]
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Graphene and carbon nanotubes were functionalized with melamine to prepare strengthening additives for polyamide 66 nanocomposites. The hybrid nanofillers of M-g-GO and M-g-CMWNT exhibited good dispersibility and compatibility, showing a synergistic effect on improving the mechanical properties of polyamide 66 fibers. The average tensile strength of the nanocomposite fibers containing M-g-GO (0.25 wt%)/M-g-CMWNTs (0.25 wt%) was 166% higher than pure PA66, with the optimal mass ratio of M-g-GO to M-g-CMWNTs being 0.25/0.25.
Graphene and carbon nanotubes are promising strengthening additives for improving the mechanical properties of polymers. Graphene oxide (GO) and carboxylic multi-walled carbon nanotubes (CMWCNTs) were functionalized through a condensation reaction to graft melamine (M) on the GO and CMWCNTs and form products (M-gGO and M-g-CMWNTs, respectively) with amino groups. Furthermore, both M-g-GO and M-g-CMWNTs were polymerized in situ with hexanediamine adipate salts to fabricate polyamide 66(PA66)/M-g-GO/M-g-CMWNT nanocomposites. They were melt-spun into fibers with various mass ratios of M-g-GO and M-g-CMWNTs. Transmission electron microscopy confirmed that one-dimensional M-g-CMWNTs could effectively suppress the stacking of individual two-dimensional M-g-GO by bridging adjacent M-g-GO sheets, resulting in a high contact area between the M-g-GO/M-g-CMWNT structures and the polyamide 66 matrix (PA66). Scanning electron microscopy of the fracture surfaces of the composite matrix showed that the M-g-GO/M-g-CMWNT hybrid nanofillers exhibited good dispersibilities and compatibilities. Additionally, the melting and crystallization behaviors of the PA66/M-g-GO/M-g-CMWNT nanocomposite fibers were characterized. The average tensile strength of the PA66/M-g-GO/M-g-CMWNT nanocomposite fibers containing M-g-GO (0.25 wt%)/M-g-CMWNTs (0.25 wt%) was 166% higher than that of pure PA66. Moreover, the tensile strength exhibited a maximum value when the mass ratio of M-g-GO to M-g-CMWNTs was 0.25/0.25. The remarkable synergistic effect between the M-g-GO and M-g-CMWNTs for improving the mechanical properties of polyamide 66 fibers was demonstrated.
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