Title: Investigations on tensile creep of CNT-epoxy shape memory polymer nanocomposites

Authors: A. Revathi; M. Sendil Murugan; Sandhya Rao; M.C. Chiranjeevi; Kavitha V. Rao; Shylaja Srihari; G.N. Dayananda

Addresses: Center for Societal Missions and Special Technologies (CSMST), CSIR-National Aerospace Laboratories, P.O. Box 1779, Old Airport Road, Bangalore –560017, India ' Center for Societal Missions and Special Technologies (CSMST), CSIR-National Aerospace Laboratories, P.O. Box 1779, Old Airport Road, Bangalore –560017, India ' Center for Societal Missions and Special Technologies (CSMST), CSIR-National Aerospace Laboratories, P.O. Box 1779, Old Airport Road, Bangalore –560017, India ' Center for Societal Missions and Special Technologies (CSMST), CSIR-National Aerospace Laboratories, P.O. Box 1779, Old Airport Road, Bangalore –560017, India ' Center for Societal Missions and Special Technologies (CSMST), CSIR-National Aerospace Laboratories, P.O. Box 1779, Old Airport Road, Bangalore –560017, India ' Center for Societal Missions and Special Technologies (CSMST), CSIR-National Aerospace Laboratories, P.O. Box 1779, Old Airport Road, Bangalore –560017, India ' Center for Societal Missions and Special Technologies (CSMST), CSIR-National Aerospace Laboratories, P.O. Box 1779, Old Airport Road, Bangalore –560017, India

Abstract: In this work, epoxy-based shape memory polymer nanocomposites (SMPnCs) were prepared using 0.5 wt% and 1 wt% multi walled carbon nanotubes (MWCNTs) pre-dispersed in epoxy resin. This was cured with triethylene tetraamine (TETA) curing agent. The glass transition temperatures (T_g) were determined using Advanced Rheometric Expansion System (ARES). The creep behaviour of the 0 wt% CNT SMPnC as well as the 0.5 wt% and 1 wt% MWCNT SMPnCs were studied through short term tensile creep test at different temperatures. Master curves of creep compliance were derived using a time-temperature superposition principle (TTSP) based on Williams-Landel-Ferry (WLF) equation. A Findley power-law model was used to predict the creep deformation behaviour of 0, 0.5 and 1 wt% CNT SMPnCs. Good correlations between experimental data and the predictive model were obtained for both SMPs particularly at lower temperature and above T_g.

Keywords: epoxy; MWCNT; multi walled carbon nanotubes; shape memory; nanocomposites; creep behaviour; analytical model.

DOI: 10.1504/IJNT.2017.086777

International Journal of Nanotechnology, 2017 Vol.14 No.9/10/11, pp.945 - 960

Published online: 24 Sep 2017 *

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