TITLE:
Performance Comparison of CVD Grown Carbon Nanofiber Based on Single- and Multi-Layer Graphene Oxides in Melt-Compounded PA6.6 Nanocomposites
AUTHORS:
Elcin Cakal Sarac, Leila Haghighi Poudeh, Jamal Seyyed Monfared Zanjani, Ilse Letofsky-Papst, Fevzi Çakmak Cebeci, Ismail Aydin, Yusuf Menceloglu, Burcu Saner Okan
KEYWORDS:
Nanoparticles, Polyamides, Nanocomposites, Mechanical Properties, Thermal Properties
JOURNAL NAME:
Open Journal of Composite Materials,
Vol.9 No.2,
April
1,
2019
ABSTRACT: In the present
study, newly design hybrid nanostructures were produced by growing long carbon nanofibers
(CNF) on single- and multi-layer graphene oxide (GO) sheets in the presence of catalyst
by chemical vapor deposition (CVD). Chemical composition analysis indicated the
formation of Fe-C bonds by the deposition of carbon atoms on catalyst surface of
Fe2O3 and increasing in C/O atomic ratio confirming CNF growing.
These hybrid additives were distributed homogeneously through polyamide 6.6 (PA6.6)
chains by high shear thermokinetic mixer in melt phase. Spectroscopic studies showed
that the differences in the number of graphene layer in hybrid structures directly
affected the crystalline behavior and dispersion state in polymer matrix. Flexural
strength and flexural modulus of PA6.6 nanocomposites were improved up to 14.7%
and 14% by the integration of 0.5 wt% CNF grown on multi-layer GO, respectively,
whereas there was a significant loss in flexural properties of single-layer GO based
nanocomposites. Also, the integration of 0.5 wt% multi-layer GO hybrid reinforcement
in PA6.6 provided a significant increase in tensile modulus about 24%. Therefore,
multi-layer GO with CNF increased the degree of crystallinity in nanocomposites
by forming intercalated structure and acted as a nucleating agent causing the improvement
in mechanical properties.