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 (Tg) 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 Tg.

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

Received: 08 May 2021
Accepted: 12 May 2021

Published online: 25 Jun 2017 *

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