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Thermo-Mechanical and ILSS Properties of Woven Carbon/Epoxy-XD-CNT Nanophased Composites

Published online by Cambridge University Press:  04 June 2014

Mohammad K. Hossain ,
Md Mahmudur R. Chowdhury ,
Mahmud B. Salam ,
Johnathan Malone ,
Mahesh V. Hosur ,
Shaik Jeelani  and
Nydeia W. Bolden
Mohammad K. Hossain*
Affiliation:
Department of Mechanical Engineering and Tuskegee University, Tuskegee, AL 36088
Md Mahmudur R. Chowdhury
Affiliation:
Department of Mechanical Engineering and Tuskegee University, Tuskegee, AL 36088
Mahmud B. Salam
Affiliation:
Department of Mechanical Engineering and Tuskegee University, Tuskegee, AL 36088
Johnathan Malone
Affiliation:
Department of Mechanical Engineering and Tuskegee University, Tuskegee, AL 36088
Mahesh V. Hosur
Affiliation:
Department of Materials Science and Engineering, Tuskegee University, Tuskegee, AL 36088
Shaik Jeelani
Affiliation:
Department of Materials Science and Engineering, Tuskegee University, Tuskegee, AL 36088
Nydeia W. Bolden
Affiliation:
Air Force Research Laboratory Munitions Directorate, Eglin AFB, FL 32542.
*
*Corresponding Author: Assistant Professor, [email protected].
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Abstract

Carbon fiber-reinforced epoxy composites (CFEC) were fabricated infusing 0, 0.15, 0.30, and 0.40 wt% amino-functionalized XD-grade carbon nanotubes (NH2-XDCNTs) using the compression molding process under 16 kips. The thermo-mechanical and interlaminar shear properties of CNT incorporated carbon/epoxy composite samples were evaluated by performing dynamic-mechanical thermal analysis (DMTA) and short beam shear (SBS) tests. XD-CNTs were infused into Epon 862 resin using a mechanical stirrer followed by a high intensity ultrasonic liquid processor for better dispersion. After the sonication, the mixture was placed in a three roll milling processor for 3 successive cycles at 140 rpm, with the gap spaces incrementally reduced from 20 to 5 μm, to obtain the uniform dispersion of CNTs throughout the resin. Epikure W curing agent was then added to the modified resin and mixed using a high-speed mechanical stirrer. Finally, the fiber was reinforced with that modified resin using the compression molding process. The results obtained from the DMTA test were analyzed based on the storage modulus, glass transition temperature, and loss modulus. The analysis indicated that the thermo-mechanical properties were linearly increasing from 0 to 0.3 wt% XDCNT loading. The SBS test results exhibited that the incorporation of XDCNTs into the composite increased the interlaminar shear strength (ILSS) by up to 22% at 0.3 wt% CNT loading. Better dispersion of XDCNTs might be attributed to more crosslinking sites and better interaction between fiber and matrix resulting in an improved fiber-matrix interface, whereas, the reaction between functional groups –NH2 of XDCNTs with epoxide groups of resin and epoxy silanes of fiber surfaces improved the crosslinking and thereby ILSS properties of carbon/epoxy composites.

Keywords

compositenanostructurescanning electron microscopy (SEM)
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1700: Symposium MM – Nanotubes and Related Nanostructures--2014 , 2014 , pp. 55 - 60
Copyright
Copyright © Materials Research Society 2014 

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