Research Papers

Studies of Mechanical Properties of Multiwall Nanotube Based Polymer Composites

[+] Author and Article Information
A. K. Gupta

Vibration and Noise Control Laboratory,
Department of Mechanical and
Industrial Engineering,
Indian Institute of Technology Roorkee,
Roorkee 247667, India;
Instruments Research and
Development Establishment,
Raipur Road,
Dehradun 248008, India
e-mail: anandmechiitr@gmail.com

S. P. Harsha

Vibration and Noise Control Laboratory,
Department of Mechanical and
Industrial Engineering,
Indian Institute of Technology Roorkee,
Roorkee 247667, India
e-mail: spharsha@gmail.com

1 Corresponding author.

Manuscript received October 14, 2014; final manuscript received December 16, 2014; published online January 13, 2015. Assoc. Editor: Roger Narayan.

J. Nanotechnol. Eng. Med 5(3), 031006 (Aug 01, 2014) (5 pages) Paper No: NANO-14-1066; doi: 10.1115/1.4029414 History: Received October 14, 2014; Revised December 16, 2014; Online January 13, 2015

The two phase polymer composites have been extensively used in various structural applications; however, there is need to further enhance the strength and stiffness of these polymer composites. Carbon nanotubes (CNTs) can be effectively used as secondary reinforcement material in polymer based composites due to their superlative mechanical properties. In this paper, effects of multiwall nanotubes (MWNTs) reinforcement on epoxy–carbon polymer composites are investigated using experiments. MWNTs synthesized by chemical vapor deposition (CVD) technique and amino-functionalization are achieved through acid-thionyl chloride route. Diglycidyl ether of bisphenol-A (DGEBA) epoxy resin with diethyl toluene diamine (DETDA) hardener has been used as matrix. T-300 carbon fabric is used as the primary reinforcement. Three types of test specimen of epoxy–carbon composite are prepared with MWNT reinforcement as 0%, 1%, and 2% MWNT (by weight). The resultant three phase nanocomposites are subjected to tensile test. It has been found that both tensile strength and strain at failure are substantially enhanced with the small addition of MWNT. The analytical results obtained from rule of mixture theory (ROM) shows good agreement with the experimental results. The proposed three phase polymer nanocomposites can find applications in composite structures, ballistic missiles, unmanned arial vehicles, helicopters, and aircrafts.

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Fig. 1

(a) Type I test specimen as per ASTM D-638 and (b) type IV test specimen as per ASTM D-638

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Fig. 2

(a) Electronic tensometer and (b) specimen under test

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Fig. 3

Tensile failure of composite wherein fiber has a higher strain to failure than the matrix: (a) stress strain relationship and (b) composite failure stress versus volume fraction of fiber

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Fig. 4

(a) Stress strain diagram of epoxy–carbon fiber with 1% MWNT by wt. and (b) stress strain diagram of epoxy–carbon fiber with 2% MWNT by wt.

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Fig. 5

Fractured sample of nanocomposites: (a) nanocomposite with 1% MWNT (by wt.) and (b) nanocomposite with 2% MWNT (by wt.)

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Fig. 6

Percentage enhancement in tensile strength and failure strain (test results)

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Fig. 7

Percentage enhancement in tensile strength (analytical results)



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