Carbon Nanopaper Sheets for Damping Applications: Processing and Characterization

2007 ◽  
Author(s):  
J. Gou ◽  
H. C. Gu ◽  
G. Song
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanofibers ◽  
Polymer Matrix ◽  
High Performance ◽  
Damping Ratio ◽  
Resin Transfer Molding ◽  
Structural Damping ◽  
Fiber Mats ◽  
Transfer Molding ◽  
Damping Characteristics

Carbon nanotubes and carbon nanofibers have been used as nanofillers for high performance damping composite materials in recent years. The large specific area (1000 m2/g) and aspect ratio (>1000) of carbon nanotubes and nanofibers promote significant interfacial friction between carbon nanotubes/nanofibers and the polymer matrix. The high stiffness and strength of carbon nanotubes and nanofibers enlarge the differences in the strains of individual constituents of the composites, which causes much higher energy dissipation in the polymer matrix. However, adding small amount of carbon nanotubes and nanofibers will significant increase the viscosity of polymer resin, which makes the dispersion and resin flow through the porous fiber mats extremely difficult. In addition, the fiber mats will filter carbon nanotubes and nanofibers during liquid molding process such as Resin Transfer Molding (RTM) and Vacuum-Assisted Resin Transfer Molding (VARTM). A unique concept of manufacturing nanocomposites with carbon nanotube/nanofiber based nanopaper sheets for structural damping applications has recently been explored. This approach involves making carbon nanopaper sheet by the filtration of well-dispersed carbon nanotubes and carbon nanofibers under controlled processing conditions. Subsequently, carbon nanopaper sheets are integrated into composite laminates using Vacuum Assisted Resin Transfer Molding (VARTM) process. In this study, several nanocomposite plates were fabricated with carbon nanopaper sheet as surface layer. For the comparative study, the regular composite plates without carbon nanopaper sheet were also fabricated. To identify the damping characteristics of each specimen, the Frequency Response Function (FRF) was estimated by a pair of piezoceramic patches: one as an actuator to excite the specimen and the other as a sensor to detect the induced vibrations. From the FRF, the damping ratio of the specimen at each modal frequency of interests was calculated. The experimental results clearly show a significant improvement of damping properties of nanocomposites plates. This research demonstrates structural damping enhancement via carbon nanopaper sheets and provided basic understanding of the damping characteristics for the optimal design and fabrication of high performance damping composites, which have the potential to be used as structural components for many applications.

Multifunctional Nanocomposites With High Damping Performance for Aerospace Structures

2009 ◽  
Author(s):  
F. Liang ◽  
Y. Tang ◽  
J. Gou ◽  
H. C. Gu ◽  
G. Song
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanofibers ◽  
Polymer Matrix ◽  
Composite Laminates ◽  
Polymer Matrix Composites ◽  
Damping Ratio ◽  
Basalt Fiber ◽  
Specific Area ◽  
Vibration Damping ◽  
Damping Characteristics

Polymer matrix composites with reinforcement of carbon nanofibers and carbon nanotubes in the form of paper sheet have shown significant vibration damping improvement compared to pure matrix materials. The large specific area (1000 m2/g) and aspect ratio (>1000) of carbon nanotubes and nanofibers promote significant interfacial friction between carbon nanotubes/nanofibers and a polymer matrix, which causes much higher energy dissipation in the polymer matrix. In this study, a unique concept of manufacturing nanocomposites with carbon nanotube/nanofiber based nanopaper sheets for vibration damping applications has been explored. The new approach includes making carbon nanopaper sheet by the filtration of well-dispersed carbon nanotubes and carbon nanofibers under controlled processing conditions. Subsequently, carbon nanopaper sheets are integrated into composite laminates as surface layer using the vacuum assistant resin transfer molding (VARTM) process. To compare the damping property of laminates constituted by different fibers, three kinds of fibers, including glass fiber, basalt fiber, and carbon fiber are used. For the comparative study, the vibration damping ratios of samples with and without carbon nanopaper sheets are determined. To identify the damping characteristics of each specimen, the Frequency Response Function (FRF) was estimated by a pair of piezoceramic patches: one as an actuator to excite the specimen and the other as a sensor to detect the induced vibrations. From the FRF, the damping ratio of the specimen at each modal frequency of interest was calculated. The experimental results clearly show a significant improvement of vibration damping properties of the nanocomposites plates. This research demonstrates vibration damping enhancement of a polymer matrix via incorporation of carbon nanopaper sheets and provided basic understanding of the damping characteristics for the optimal design and fabrication of high performance damping composites, which have the potential to be used as structural components for different applications.

Preparation and Vibration Damping Characteristics of Wide Frequency Domain PVMQ/IIR Foam Materials

2012 ◽  
Vol 538-541 ◽  
pp. 2298-2303
Author(s):  
Shi Kai Luo ◽  
Guo Fang Ding ◽  
Jing Li Li ◽  
Yan Song Sha ◽  
Qing Min Cheng ◽  
...  
Keyword(s):  
Frequency Domain ◽  
Wide Temperature Range ◽  
Damping Ratio ◽  
Vibration Damping ◽  
Simple Equation ◽  
Structural Damping ◽  
Damping Characteristics ◽  
Damping Materials ◽  
Foaming Technology ◽  
Isoprene Rubber

In this paper, we prepared foaming silicon rubber (PVMQ) /isobutylene-isoprene rubber (IIR) composites with chemical foaming technology. The DMA tests results showed that these foaming materials have effective damping characteristics in a wide temperature range. With the special vibrator, we found that the PVMQ/IIR foams that we prepared were the damping materials which has wide frequency domain, because they can keep high damping ratio in a wide frequency domain. When the preloading was between 1.0 mm and 1.7 mm, the structural damping did not change obviously. According to tests, we found that the damping ratio of these foams was fit to the simple equation .

scholarly journals Multiscale Composites: Assessment of a Feasible Manufacturing Process

2019 ◽  
Vol 2019 ◽  
pp. 1-8
Author(s):  
R. Volponi ◽  
P. Spena ◽  
F. De Nicola ◽  
L. Guadagno
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Fiber ◽  
Manufacturing Process ◽  
Resin Transfer Molding ◽  
Fiber Reinforced ◽  
Transfer Molding ◽  
Macro Scale ◽  
Multiscale Composite ◽  
The Matrix ◽  
Carbon Fiber Reinforced

A very interesting field of research on advanced composite materials is the possibility to integrate new functionalities and specific improvements acting on the matrix of the composite by means of a nanocharged resin. In this way, the composite becomes a so-called “multiscale composite” in which the different phases change from nano to macro scale. For example, the incorporation of nanoscale conductive fillers with intrinsically high electrical conductivity could allow a tailoring of this property for the final material. The properties of carbon nanotubes (CNT) make them an effective candidate as fillers in polymer composite systems to obtain ultralight structural materials with advanced electrical and thermal characteristics. Nevertheless, several problems are related to the distribution in the matrix and to the processability of the systems filled with CNT. Existing liquid molding processes such as resin transfer molding (RTM) and vacuum-assisted resin transfer molding (VARTM) can be adapted to produce carbon fiber reinforced polymer (CFRP) impregnated with CNT nanofilled resins. Unfortunately, the loading of more than 0.3-0.5% of CNT can lead to high resin viscosities that are unacceptable for such kind of processes. In addition to the viscosity issues that are related to the high CNT content, a filtration effect of the nanofillers caused by the fibrous medium may also lead to inadequate final component quality. This work describes the development of an effective manufacturing process of a fiber-reinforced multiscale composite panel, with a tetra-functional epoxy matrix loaded with carbon nanotubes to increase its electrical properties and with GPOSS to increase its resistance to fire. A first approach has been attempted with a traditional liquid infusion process. As already anticipated, this technique has shown considerable difficulties related both to the low level of impregnation achieved, due to the high viscosity of the resin, and to the filtration effects of the dispersed nanocharges. To overcome these problems, an opportunely modified process based on a sort of film infusion has been proposed. This modification has given an acceptable result in terms of impregnation and morphological arrangement of CNTs in nanofilled CFRP. Finally, the developed infiltration technique has been tested for the manufacture of a carbon fiber-reinforced panel with a more complex shape.

Hierarchical material of carbon nanotubes grown on carbon nanofibers for high performance electrochemical capacitor

2018 ◽  
Vol 345 ◽  
pp. 39-47 ◽  
Author(s):  
Tolendra Kshetri ◽  
Tran Duy Thanh ◽  
Soram Bobby Singh ◽  
Nam Hoon Kim ◽  
Joong Hee Lee
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanofibers ◽  
High Performance ◽  
Electrochemical Capacitor

Preparation and properties of new high performance maleimide-triazine resins for resin transfer molding

2010 ◽  
Vol 22 (12) ◽  
pp. 1572-1580 ◽  
Author(s):  
Qingbao Guan ◽  
Aijuan Gu ◽  
Guozheng Liang ◽  
Cheng Zhou ◽  
Li Yuan
Keyword(s):  
High Performance ◽  
Resin Transfer Molding ◽  
Transfer Molding

Use of nanofiber in high-performance fluorinated elastomer – Processing, mechanical, electrical, swelling and morphology characteristics

2020 ◽  
pp. 002199832094893
Author(s):  
Felipe Gustavo Ornaghi ◽  
Heitor Luiz Ornaghi ◽  
Jordão Gheller ◽  
Marly Antônia Maldaner Jacobi
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Black ◽  
Carbon Nanofibers ◽  
High Performance ◽  
Hybrid Composites ◽  
Academic Research ◽  
Rubber Composites ◽  
Research Fields ◽  
Roll Mill ◽  
Internal Mixer

Property optimization is essential in both industrial and academic research fields. In this study, novel fluorinated rubber composites were manufactured with carbon nanofibers and compared to a standard control formulation (with 30 phr carbon black) and with carbon nanotubes. Hybrid composites with carbon nanotubes and/or nanofibers and carbon black were also produced. Also, two processing conditions (internal mixing and co-processing using an internal mixer followed by a two-roll mill) were tested in terms of the overall mechanical, morphological, electrical, dynamic mechanical, and swelling responses of the rubber composites. The results suggested a synergistic effect for both nanofillers and provided reinforcement and electrical conductivity due to filler-polymer interactions and the formation of a percolation threshold, respectively. Carbon nanofibers are an alternative to replace carbon nanotubes due to their lower cost and they are easier to be chemically modified.

The effect of different variables on in-plane radial permeability of natural fiber mats

2016 ◽  
Vol 37 (19) ◽  
pp. 1191-1201 ◽  
Author(s):  
Michael Ehresmann ◽  
Ali Amiri ◽  
Chad Ulven
Keyword(s):  
Fiber Volume Fraction ◽  
Natural Fiber ◽  
Volume Fraction ◽  
Resin Transfer Molding ◽  
Limited Information ◽  
Fiber Volume ◽  
Fiber Mats ◽  
Transfer Molding ◽  
Fiber Size ◽  
Wax Content

There has been a vast growth in manufacturing of fiber reinforced plastics by means of liquid composite molding such as resin transfer molding and vacuum-assisted resin transfer molding processes. In these processes, compression of the porous media and pressure of the injected resin result in in-mold forces that need to be determined. Limited information exists regarding the processing parameters and extent of reinforcing potential natural fibers have in polymer matrices. Current study investigates the effect of different variables such as fiber volume fraction, shive content, fiber size, wax content, and resin viscosity on permeability of five different natural fiber mats. Flax fiber with low-, medium-, and high-shive content as well as hemp and kenaf fiber mats was selected for this study and an original experimental device was setup to measure the permeability of the mentioned fiber mats based on different variables. It was found that increasing fiber volume fraction will result in reduction of permeability of all mats. The presence of shive and larger fiber size increased the permeability. Higher wax content lowered the permeability. These competing factors could be used by manufacturers to produce a mat which had optimum permeability while still maintaining acceptable strength.

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