Silanized Graphene-Based Nanocomposite Coatings on Fiber Reinforced Composites Against the Environmental Degradations

2014 ◽  
Author(s):  
D. Diouf ◽  
R. Asmatulu
Keyword(s):  
High Speed ◽  
Fiber Reinforced Composites ◽  
Nanocomposite Coatings ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Water Contact ◽  
Force Microscopy ◽  
Performance Improvements ◽  
Graphene Nanoflakes ◽  
Infrared Spectrometer

This report presents the development of graphene-based nanocomposite coatings on the fiber reinforced composites to improve the coating resistance against the corrosion and other environmental weathering. Graphene nanoflakes were initially functionalized through a silanization process, and then dispersed well into the polyurethane primer and top coats at 0, 2, 4 and 8wt% using high speed agitation and sonication processes. The dispersed nanocomposite coatings were an air sprayed on the surfaces of the composite coupons at different thicknesses, and cured prior to the alternative UV and salt fog exposure tests for 20 days. The performance analyses of the nanocomposite coatings were carried out using atomic force microscopy (AFM), Fourier transform infrared spectrometer (FTIR), thickness measurements, water contact angle, and electro-chemical impedance spectroscopy tests. The test results indicated that the silanization process on the graphene nanoflakes significantly improved the corrosion resistances of the nanocomposite coatings when compared to the non-functionalized graphenes. This study may be useful for the performance improvements of many coatings on the composite aircraft, wind turbines and other applications.

Effects of Graphene Oxide Thin Films and Nanocomposite Coatings on Flame Retardancy and Thermal Stability of Aircraft Composites: A Comparative Study

2019 ◽  
Vol 141 (3) ◽  
Author(s):  
Md. Nizam Uddin ◽  
Louie Le ◽  
Rajeev Nair ◽  
Ramazan Asmatulu
Keyword(s):  
Thin Film ◽  
Graphene Oxide ◽  
Local Heat ◽  
Polymeric Matrix ◽  
Fiber Reinforced Composites ◽  
Nanocomposite Coatings ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Thermal Tests ◽  
Percentage Weight

A polymer matrix system of thermoset fiber-reinforced composites helps protect its high modulus and strength fibers from an adverse environment and transfers the load to the reinforced fibers. However, when subjected to a high temperature that exceeds its postcuring-stage temperature, the polymeric matrix will decompose or be charred. To address this issue, various techniques have been developed to improve the flame-retardant property of the polymeric matrix. One of these techniques is to either delay ignition or release moisture to extinguish the flame by combining other chemicals or reactively modifying the epoxy resin. Graphene oxide (GO) nanofilms deposited on top of composite surfaces were compared with the test results of nanocomposite coatings of GO and nanoclay particles on composite surfaces. GO thin film applied to the surface of fiber-reinforced composites acts as a heat shield to quickly dissipate heat and eliminate local heat formation. Thermal tests, such as thermogravimetric analysis (TGA), 45-deg burn tests, vertical burn tests, and surface paint adhesion tests were accomplished. Average burn lengths and the average burn areas were reduced with nanoparticle inclusion to the nanoclay samples and graphene samples. TGA analysis indicated that the nanoclay inclusion samples, as well as the graphene inclusion samples, have a higher percentage weight loss than that of the base sample. GO inclusion samples were less affected than nanoclay inclusion samples during the vertical as well as 45-deg burn tests. In addition, there were no signs of damage to the GO thin film that was secondarily bonded to the surface of composite panels for the burn test.

Stress-strain behavior of carbon filament yarns under high strain rates

2012 ◽  
Vol 82 (7) ◽  
pp. 685-699 ◽  
Author(s):  
Ayham Younes ◽  
Vignaesh Sankaran ◽  
André Seidel ◽  
Martin Waldmann ◽  
Chokri Cherif ◽  
...  
Keyword(s):  
High Speed ◽  
Test Method ◽  
Fiber Reinforced Composites ◽  
Impact Loads ◽  
Strain Rates ◽  
Reinforced Composites ◽  
Test Results ◽  
Fiber Reinforced ◽  
Carbon Filament ◽  
Extreme Stress

Fiber-reinforced composites used in numerous technical applications have to meet the ever increasing safety requirements. Resistance to extreme stress under high velocity impact loads assumes even greater significance. Previous studies on the behavior of fiber-reinforced composites under impact loads provide little insight about the properties of filament yarns, a basis for many composite applications. Hence this paper focuses on the development of a suitable test method for performing high speed tensile tests on all filament yarn types, and the acquisition and analysis of the test results. This will enable the derivation of material models for their usage in the field of composites applications. Initially, the widely used carbon fiber filament yarns have been tested. The conclusive test results with a reduced yarn clamp mass and high stiffness of the test apparatus indicate that tensile strength and modulus of elasticity of carbon filament yarns increase with higher strain rates.

Applications of Composites on Textile Machinery

2011 ◽  
Vol 233-235 ◽  
pp. 1222-1226
Author(s):  
Sai Nan Wei ◽  
Li Chen
Keyword(s):  
Carbon Fiber ◽  
High Speed ◽  
Rational Design ◽  
Fiber Composite ◽  
Rapid Development ◽  
Fiber Reinforced Composites ◽  
High Price ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Carbon Fiber Composite

High performance fiber reinforced composites have a long history and wide usage in aerospace, sports, military, etc. In this paper applications of composites on textile machinery were elaborated, such as carbon-fiber reinforced plastic (CFRP) guide bar, composite rapier belt and rapier head in rapier loom, nylon shuttle, carbon fiber composite heddle frame for high-speed looms, transmission shaft, needle bed, conveyor belts. It indicated that the composites can improve the performance obviously. Along with the rapid development of textile, fiber reinforced composites are continuous replacing the traditional materials as cast iron, steel and aluminum textile machine parts, But the applications of composites on textile machinery are still in the initial stage. High price is the major obstruction factor for its development. Through improving the level of automation technology, reducing producing cost, rational design of structure, the producing cost can be sharply reduced, which is also benefit for textile machinery development.

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