Investigations on tensile creep of CNT-epoxy shape memory polymer nanocomposites Online publication date: Sun, 24-Sep-2017
by A. Revathi; M. Sendil Murugan; Sandhya Rao; M.C. Chiranjeevi; Kavitha V. Rao; Shylaja Srihari; G.N. Dayananda
International Journal of Nanotechnology (IJNT), Vol. 14, No. 9/10/11, 2017
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.
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