Co-milling-assisted exfoliated graphite nanoplatelets filler introduction in polyethylene and alumina composites

2018 ◽  
Vol 53 (13) ◽  
pp. 1815-1826
Author(s):  
Sheng Cai Tan ◽  
Jimmy KW Chan ◽  
Kian Ping Loh
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Composite Materials ◽  
Exfoliated Graphite ◽  
Flexural Properties ◽  
Graphite Nanoplatelets ◽  
Alumina Composites ◽  
Exfoliated Graphite Nanoplatelets ◽  
Polyethylene Composites

This paper aims to investigate the effect of co-milling-assisted exfoliation of graphite into polyethylene and alumina matrices on the mechanical properties of the composites. Tensile mechanical properties of composite materials based on polyethylene reinforced with graphite and graphite-derived fillers at 0–0.75 wt% loading were investigated, while hardness and flexural properties of alumina composites with 0.25 wt% loading of the same additives were assessed. Exfoliated graphite, applied at 0.25–0.75 wt% in pre-exfoliated form or in a co-milling-assisted fashion, has been demonstrated to be effective in enhancing the tensile strength of polyethylene composites. Similar enhancement in hardness and flexural properties was observed in alumina composites with 0.25 wt% loading of the exfoliated graphite. Co-milling-assisted exfoliated graphite nanoplatelets additive introduction has been found to effect a more desirable mechanical properties enhancement in the composites investigated in this study.

scholarly journals Mechanical properties and microstructural investigation of polypropylene/exfoliated graphite nanoplatelets/ nano-magnesium oxide composites

2018 ◽  
Vol 7 (2) ◽  
pp. 897
Author(s):  
A I. Alateyah ◽  
F H. Latief
Keyword(s):  
Mechanical Properties ◽  
Flexural Modulus ◽  
Exfoliated Graphite ◽  
Graphite Nanoplatelets ◽  
Microstructural Investigation ◽  
The Matrix ◽  
Exfoliated Graphite Nanoplatelets ◽  
Polypropylene Matrix ◽  
Xrd Patterns ◽  
Oxide Composites

Polypropylene/exfoliated graphite nanoplatelets composites reinforced with a low concentration of nano-magnesia have been successfully fabricated, using injection molding machine. The mechanical properties and microstructure of the composites were investigated, in the present study. The XRD patterns of the composites showed the peaks of xGnP and n-MgO, where the intensity of the xGnP peaks became stronger with increasing the concentration of xGnP added into polypropylene matrix. In addition, the SEM micrographs revealed a good dispersion of fillers within the matrix. The results showed that increasing the amount of exfoliated graphite nanoplatelets up to 10 wt. % resulted in increasing the composite flexural strength, flexural modulus, and hardness up to 35% and 91%, 6.7%, respectively, compared to the monolithic polypropylene.  

Exfoliated graphite nanoplatelets/poly(arylene ether nitrile) nanocomposites

2016 ◽  
Vol 29 (10) ◽  
pp. 1121-1129 ◽  
Author(s):  
Yingqing Zhan ◽  
Zhihang Long ◽  
Xinyi Wan ◽  
Yi He ◽  
Xiaobo Liu
Keyword(s):  
Electron Microscopy ◽  
Tensile Strength ◽  
In Situ Polymerization ◽  
Decomposition Temperature ◽  
Exfoliated Graphite ◽  
Graphite Nanoplatelets ◽  
Initial Decomposition Temperature ◽  
Arylene Ether ◽  
Exfoliated Graphite Nanoplatelets

In this work, we demonstrate a method for synthesis of exfoliated graphite nanoplatelets (xGnPs)/poly(arylene ether nitrile) (PEN) nanocomposites via an efficient in situ polymerization. The GnPs were treated by the ultrasonic bath to reduce the layers of the GnPs, where the PEN were intercalated subsequently. Therefore, the dispersion of xGnP in the PEN resin was enhanced through in situ polymerization, which was characterized and confirmed by scanning electron microscopy, transmission electron microscopy, and Fourier transform infrared spectroscopy. It was found that the tensile strength and modulus were greatly enhanced with the addition of xGnP. For 2.5 wt% of xGnP-reinforced PEN, the tensile strength and modulus were increased to 115 MPa and 3121 MPa, respectively. Owing to the well dispersion of xGnP, the low rheological percolation of 2.5 wt% for PEN nanocomposites was obtained. Besides, with 1 wt% of xGnP, the corresponding initial decomposition temperature ( Tin) increased from 451°C in pure PEN to 470°C. The addition of xGnP showed enhanced thermal stability of PEN nanocomposites, which demonstrated a promising method for preparing advanced polymer-based nanocomposites.

Preparation and Properties of PS/PSEG Composite Materials

2011 ◽  
Vol 284-286 ◽  
pp. 1842-1845
Author(s):  
Jue Wang ◽  
Gui Xiang Hou
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Tensile Strength ◽  
Electrical Resistivity ◽  
Composite Materials ◽  
Impact Strength ◽  
Expanded Graphite ◽  
Exfoliated Graphite ◽  
Melt Blending ◽  
Lower Tensile Strength

Polystyrene(PS)/Polystyrene-expanded graphite(EG)(PS/PSEG) composites were prepared by melt blending, using a variety of PSEG. The electrical and mechanical properties of the PS/PSEG were measured. Mechanical property measurements of composites indicated higher impact strength and lower tensile strength with increasing content of PSEG. Exfoliated graphite has seen a significant reduction for composites in electrical resistivity.

Characterization of exfoliated graphite nanoplatelets/polycarbonate composites: electrical and thermal conductivity, and tensile, flexural, and rheological properties

2011 ◽  
Vol 46 (9) ◽  
pp. 1029-1039 ◽  
Author(s):  
Julia A King ◽  
Michael D Via ◽  
Faith A Morrison ◽  
Kyle R Wiese ◽  
Edsel A Beach ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Tensile Strength ◽  
Electrical Resistivity ◽  
Ultimate Tensile Strength ◽  
Flexural Strength ◽  
Rheological Properties ◽  
Flexural Modulus ◽  
Exfoliated Graphite ◽  
Graphite Nanoplatelets ◽  
Exfoliated Graphite Nanoplatelets

Exfoliated graphite nanoplatelets (GNP) can be added polymers to produce electrically conductive composites. In this study, varying amounts (2–15 wt%) GNP were added to polycarbonate (PC) and the resulting composites were tested for electrical conductivity (1/electrical resistivity), thermal conductivity, and tensile, flexural, and rheological properties. The percolation threshold was approximately 4.0 vol% (6.5 wt%) GNP. The addition of GNP to polycarbonate increased the composite electrical and thermal conductivity and tensile and flexural modulus. The 8 wt% (5.0 vol%) GNP in polycarbonate composite had a good combination of properties for electrostatic dissipative applications. The electrical resistivity and thermal conductivity were 4.0 × 107 ohm-cm and 0.37 W/m · K, respectively. The tensile modulus, ultimate tensile strength, and strain at ultimate tensile strength were 3.5 GPa, 58 MPa, and 3.5%, respectively. The flexural modulus, ultimate flexural strength, and strain at ultimate flexural strength were 3.6 GPa, 108 MPa, and 5.5%, respectively. Ductile tensile behavior is noted in pure polycarbonate and in samples containing up to 8 wt% GNP. PC and GNP/PC composites show shear-thinning behavior. Viscosity of the composite increased as the amount of GNP increased dueto a volume-filling filler effect. The viscosity of the GNP/PC composites are well described by a Kitano-modified Maron-Pierce model.

Preparation and Properties of PS/PSMA/EG Composite Materials

2010 ◽  
Vol 163-167 ◽  
pp. 1991-1994 ◽  
Author(s):  
Gui Xiang Hou ◽  
Sheng Yuan Liu ◽  
Xiao Ming Sang
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Tensile Strength ◽  
Electrical Resistivity ◽  
Composite Materials ◽  
Impact Strength ◽  
Expanded Graphite ◽  
Exfoliated Graphite ◽  
Melt Blending ◽  
Lower Tensile Strength

Polystyrene (PS)/Poly(S-co-MA)/expanded graphite(EG)(PS/PSMA/EG) nanocomposites were prepared by melt blending, using a variety of PSMA/EG.. The electrical and mechanical properties of the PS/PSMA/EG were measured. Mechanical property measurements of composites indicated higher impact strength and lower tensile strength with increasing concentration of PSMA/EG. Exfoliated graphite has seen a significant reduction for composites in electrical resistivity.

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