Effects of Needle Coke Conductive Additive on the Performance of Graphite/Resin Composite Plates

SUMMARY Objectives: This study evaluated the effect of argon plasma treatment (PLA) and its combination with sandblasting (SAN), silanization (SIL), and hydrophobic bonding resin (HBR) application on the micro-shear bond strength of water-aged restorative resin composite to a newly placed composite, simulating restoration repair. Methods and Materials: Forty-five light-cured composite plates (20-mm long × 20-mm wide × 4-mm thick) were fabricated using a hybrid composite and stored at 37°C in distilled water for six months. The aged composite surfaces were treated according to the following experimental groups, varying both treatment and order of application: 1) SAN + SIL + HBR (control), 2) SAN + PLA for 30 seconds + SIL + HBR, 3) SAN + SIL + PLA + HBR, 4) PLA + SIL + HBR, 5) PLA + SIL, 6) PLA + HBR, 7) SIL + PLA + HBR, 8) SIL + PLA, and 9) PLA. After the surface treatments, four fresh resin composite cylinders (1.5-mm high × 1.5-mm diameter) of the same composite were built on each aged composite surface using a silicone mold. After water storage for 24 hours or one year, the specimens were submitted to shear bond strength testing. Data were statistically analyzed by two-way analysis of variance and Tukey's test (5%). Results: Groups 1, 2, and 4 presented significantly higher bond strength means at 24 hours, although group 4 did not differ from group 7. Groups 5, 8, and 9 demonstrated significantly lower means than the other groups. Even though groups 1 and 2 had a significant bond strength reduction after 1 year, they still demonstrated higher bond strength at one year of storage. Conclusions: While PLA application combined with surface treatment methods demonstrated high bond strength results, this treatment alone was not as beneficial as other methods that included SAN, SIL and HBR.

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Fabrication and characterization of TiO2 particulate filled agave Americana fiber-reinforced polyester resin composites

Pigment & Resin Technology ◽

10.1108/prt-08-2018-0079 ◽

2019 ◽

Vol 48 (6) ◽

pp. 533-539 ◽

Cited By ~ 1

Author(s):

Vivekanandan D. ◽

Sakthivel M. ◽

Srinivasa Moorthy S. ◽

Ajith Arul Daniel S.

Keyword(s):

Mechanical Properties ◽

Polyester Resin ◽

Resin Composite ◽

Composite Plates ◽

Content Type ◽

Agave Americana ◽

New Type ◽

Automobile Components ◽

Practical Implications

Purpose In this study, TiO2 is used to enhance the mechanical properties of the composite material containing agave Americana fiber and polyester resin. Design/methodology/approach Agave Americana fiber was first treated with 5% of NaOH, and the composition of treated and untreated fiber was kept constant, whereas the particulate and resin were alternatively used. The handlay method is used to fabricate the composite plates. The morphology of the composites was studied using scanning electron microscopy (SEM). Findings The composite was composed of 30% treated agave Americana, 10% of TiO2 particulates and 60% of a polyester resin for better and enhanced mechanical properties. Practical implications The composite can be used for aero-structural components, automobile components and other areas where light-weight components are required. Originality/value A new type of agave Americana fiber with TiO2 and polyester resin composite was fabricated and investigated.

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Microwave absorption and flexural properties of Fe nanoparticle/carbon fiber/epoxy resin composite plates

Composite Structures ◽

10.1016/j.compstruct.2015.05.054 ◽

2015 ◽

Vol 131 ◽

pp. 1132-1141 ◽

Cited By ~ 50

Author(s):

Asif Shah ◽

Yonghui Wang ◽

Hao Huang ◽

Li Zhang ◽

Dongxing Wang ◽

...

Keyword(s):

Carbon Fiber ◽

Epoxy Resin ◽

Microwave Absorption ◽

Resin Composite ◽

Composite Plates ◽

Flexural Properties ◽

Epoxy Resin Composite ◽

Carbon Fiber Epoxy

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Synthesis and Properties of Highly Conducting Natural Flake Graphite/Phenolic Resin Composite Bipolar Plates for Pem Fuel Cells

Advanced Composites Letters ◽

10.1177/096369351602500402 ◽

2016 ◽

Vol 25 (4) ◽

pp. 096369351602500 ◽

Cited By ~ 2

Author(s):

Rajeev K. Gautam ◽

Kamal K. Kar

Keyword(s):

Fuel Cells ◽

Phenol Formaldehyde ◽

Resin Composite ◽

Composite Plates ◽

Pem Fuel Cells ◽

Molding Pressure ◽

Formaldehyde Resin ◽

Mechanical And Thermal Properties ◽

Flake Graphite ◽

Bipolar Plates

Electrically conductive composite bipolar plates consisting of resole-typed phenol formaldehyde resin and natural flake graphite (NFG) have been fabricated by compression molding technique at room temperature. The aim of this study is to investigate the effects of NFG content, molding pressure, and nano-sized carbon black (NCB) on the properties of composite bipolar plates. The NFG/resin composite plates have been studied for various properties including electrical, mechanical, and thermal properties. It has been observed that the composite plates prepared at NFG content of 45 wt%, NCB content of 4.5 wt%, and molding pressure of 15 MPa have optimum properties. Under optimal conditions, bipolar plates showed better properties at bulk density 1.79 g/cc, electrical conductivity 358 S/cm, flexural strength 29.3 MPa, compressive strength 43.6 MPa, water absorption 0.34% and surface microhardness 72.6 HV. Additionally, the plates were thermally stable up to 300°C. Hence, NFG/resin composites successfully fulfil the DOE-2015 requirements for bipolar plates in PEM fuel cells.

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Silicification of wood-cell walls

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100169870 ◽

1994 ◽

Vol 52 ◽

pp. 428-429

Author(s):

S. E. Keckler ◽

D. M. Dabbs ◽

N. Yao ◽

I. A. Aksay

Keyword(s):

Electron Microscopy ◽

Cell Wall ◽

Cell Walls ◽

Lignin Content ◽

Resin Composite ◽

Middle Lamella ◽

Cellulose Fibers ◽

Complex Structures ◽

Rich Region ◽

Inorganic Precursors

Cellular organic structures such as wood can be used as scaffolds for the synthesis of complex structures of organic/ceramic nanocomposites. The wood cell is a fiber-reinforced resin composite of cellulose fibers in a lignin matrix. A single cell wall, containing several layers of different fiber orientations and lignin content, is separated from its neighboring wall by the middle lamella, a lignin-rich region. In order to achieve total mineralization, deposition on and in the cell wall must be achieved. Geological fossilization of wood occurs as permineralization (filling the void spaces with mineral) and petrifaction (mineralizing the cell wall as the organic component decays) through infiltration of wood with inorganics after growth. Conversely, living plants can incorporate inorganics into their cells and in some cases into the cell walls during growth. In a recent study, we mimicked geological fossilization by infiltrating inorganic precursors into wood cells in order to enhance the properties of wood. In the current work, we use electron microscopy to examine the structure of silica formed in the cell walls after infiltration of tetraethoxysilane (TEOS).

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