Thermo-Mechanical Creep and Recovery of CTBN–Epoxy Shape Memory Polymers Under Saline Environment

  • A. RevathiEmail author
  • M. Sendil Murugan
  • Sandhya Rao
Conference paper
Part of the Lecture Notes in Mechanical Engineering book series (LNME)


In the present study, the creep and recovery experiments of unmodified epoxy SMP and 5% carboxyl-terminated butadiene acrylonitrile (CTBN) modified epoxy SMPs were carried out after being exposed to saline environment (5% NaCl, 35 °C/98% RH). The creep results of the SMP specimens before and after exposure to saline environment, obtained through short-term tensile creep test at different temperatures (i.e., 25, 80, 103 and 120 °C) and loading conditions, were compared. Prior to exposure to saline environment, the creep strain was found to increase with increasing temperature and reached a maximum around the glass transition temperature (i.e., 103 °C). A higher creep recovery ratio was noticed in the CTBN-modified epoxy SMP particularly at high-temperature conditions. The creep strain was higher in saline environment at 25, 80 and 103 °C; however, at 120 °C both the SMPs could not withstand the applied load. The creep recovery ratio was unaffected by the saline environment in both the SMPs.


Themo-mechanical Creep Recovery CTBN SMP Saline 


  1. 1.
    Otsuka K, Wayman CM (1998) Shape memory materials. Cambridge University Press, New YorkGoogle Scholar
  2. 2.
    Lendlein AS, Kelch S (2002) Shape-memory polymers. Angew Chem 41:2034–2057CrossRefGoogle Scholar
  3. 3.
    Lendlein AS, Kelch S, Kratz K, Schulte J (2005) Shape-memory polymers. In: Encyclopedia of Materials, Elsevier, Amsterdam, pp 1–9Google Scholar
  4. 4.
    Nakayama K (1991) Properties and application of shape-memory polymers. Int J Polym Sci Technol 18:T43–T48Google Scholar
  5. 5.
    Venkata SC, Derrick R (2010) Dean, Gregg, M. Janowski.: Effect of environmental weathering on flexural creep behavior of long fiber-reinforced thermoplastic composites. Polym Degrad Stab 95:2628–2640CrossRefGoogle Scholar
  6. 6.
    Arao Y, Koyanagi J, Utsunomiya S, Takeda S, Kawada H (2009) Analysis of time-dependent deformation of a CFRP mirror under hot and humid conditions. Mech Time-Depend Mater 13:183–197CrossRefGoogle Scholar
  7. 7.
    Kim H, Takemura K (2011) Influence of water absorption on creep behaviour of carbon fiber/epoxy laminates. Procedia Eng 10:2731–2736Google Scholar
  8. 8.
    Song WB, Wang ZD (2013) Characterization of viscoelastic behavior of shape memory epoxy systems. J Appl Polym Sci 128:199–205CrossRefGoogle Scholar
  9. 9.
    Al-Salloum YA, Almusallam TH (2007) Creep effect on the behavior of concrete beams reinforced with GFRP bars subjected to different environments. Constr Build Mater 21:1510–1519Google Scholar
  10. 10.
    Maksimov RD, Sokolov EA, Mochalov VP (1975) Effect of temperature and moisture on the creep of polymeric materials. One-dimensional extension under stationary Temperature–moisture conditions. Inst Polym Mech 3:393–399Google Scholar
  11. 11.
    Kawai M, Mauko Y (2004) Creep behavior of unidirectional and angle-ply T800/3631 laminates at high temperature and simulations using a phenomenological viscoplasiticity model. Compos Sci Technol 64:2373–2384CrossRefGoogle Scholar
  12. 12.
    Kavitha, Revathi A, Rao S, Srihari S, Dayananda GN (2012) Characterization of shape memory behaviour of CTBN-epoxy resin system. J Polym Res 19:1–7Google Scholar
  13. 13.
    Revathi A, Murugan MS, Rao S, Rao KV (2016) Estimation of creep and recovery of carboxyl-terminated butadiene acrylonitrile-epoxy shape memory polymers under tensile loading. Ind J Adv Chem Sci S1:39–44Google Scholar
  14. 14.
    Brahmananda P, Raju Mantena P (2011) Viscoelastic response of graphite platelet and CTBN reinforced vinyl ester nanocomposites. Mater Sci Appl 2:1667–1674Google Scholar
  15. 15.
    Vlasveld DPN, Bersee HEN, Picken SJ (2005) Creep and physical ageing of PA6. Polymer 46:12539–12545CrossRefGoogle Scholar

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© Springer Nature Singapore Pte Ltd. 2018

Authors and Affiliations

  1. 1.Centre for Societal Missions and Special Technologies (CSMST), CSIR-National Aerospace Laboratories (NAL)BangaloreIndia

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