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Influence of temperature on tensile behavior of multiwalled carbon nanotube modified epoxy nanocomposites

Published online by Cambridge University Press:  27 August 2014

Aroor Revathi ,
Sandhya Rao ,
Kavitha V. Rao ,
Myadam Rajendra Prakash ,
Mohanraj Sendil Murugan ,
Shylaja Srihari  and
Gidnahalli Narayana Reddy Dayananda
Aroor Revathi
Affiliation:
Centre for Societal Missions & Special Technologies, CSIR-National Aerospace Laboratories, Bangalore 560017, India
Sandhya Rao*
Affiliation:
Centre for Societal Missions & Special Technologies, CSIR-National Aerospace Laboratories, Bangalore 560017, India
Kavitha V. Rao*
Affiliation:
Centre for Societal Missions & Special Technologies, CSIR-National Aerospace Laboratories, Bangalore 560017, India
Myadam Rajendra Prakash
Affiliation:
Centre for Societal Missions & Special Technologies, CSIR-National Aerospace Laboratories, Bangalore 560017, India
Mohanraj Sendil Murugan
Affiliation:
Centre for Societal Missions & Special Technologies, CSIR-National Aerospace Laboratories, Bangalore 560017, India
Shylaja Srihari
Affiliation:
Centre for Societal Missions & Special Technologies, CSIR-National Aerospace Laboratories, Bangalore 560017, India
Gidnahalli Narayana Reddy Dayananda
Affiliation:
Centre for Societal Missions & Special Technologies, CSIR-National Aerospace Laboratories, Bangalore 560017, India
*
a)Address all correspondence to this author. e-mail: sandhya.rao@nal.res.in
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Abstract

An investigation was carried out to characterize the tensile behavior of multiwalled carbon nanotube (MWCNT) modified epoxy nanocomposites in the glassy, viscoelastic, and rubbery regimes. 1 and 2 wt% MWCNT predispersed epoxy was used in this study. The cured samples were characterized using dynamic mechanical analysis for selection of different temperatures. The stress–strain behavior and toughness were determined in the temperature band of 25–140 °C. Addition of 1% CNT resulted in 16% improvement in the storage modulus at glassy state but 6% reduction in storage modulus was seen for 2% CNT-epoxy system. Tensile results showed that the strength and modulus have improved for 1% CNT-epoxy system. This study also revealed that for all the three systems, failure strain was maximum near the glass transition temperature (Tg) and significantly reduced above Tg. Also the CNT-modified epoxies showed improved toughness.

Keywords

epoxyMWCNTDMAtensiletemperaturestress–straintoughness
Type
Articles
Information
Journal of Materials Research , Volume 29 , Issue 15 , 14 August 2014 , pp. 1635 - 1641
Copyright
Copyright © Materials Research Society 2014 

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References

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