Abstract
Temperature-memory effects in polymers under stress-free conditions are typically limited to one way effects. Recently, crosslinked polymer networks comprising crystallizable domains, which were capable of a reversible temperature-memory effect (rTME) under stress-free conditions, were introduced. The utilization of crystallizable actuator domains (AD) and shape determining domains (SD) where related to two different temperature ranges of a single broad melting temperature transition in case of rTME. In this study we investigated the nanostructure of crosslinked poly[ethylene-co-(vinyl acetate)] cPEVA capable of rTME in situ during actuation cycles utilizing X-ray scattering techniques and related the changes on the nanoscale to effects on the macroscopic scale. It was observed that 23% of SD obtained at a separation temperature of 75 °C gave the highest reversible strain and when exceeding 80 °C only isotropic crystallization occurred and no rTME was observed. Furthermore, distances between oriented crystalline lamellae correlated to the macroscopic actuation during heating-cooling cycles, exhibiting long-periods from 14 to 17 nm as function of temperature.
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Q. Zhao, M. Behl, and A. Lendlein, Soft Matter 9, 1744(2013).
T. Chung, A. Romo-Uribe, and P.T. Mather, Macromolecules, 41 184 (2008).
J. Li, W.R. Rodgers, and T. Xie, Polymer 52, 5320 (2011).
M. Bothe and T. Pretsch, Macromol. Chem. Phys. 213, 2378 (2012).
M. Behl, K. Kratz, J. Zotzmann, U. Nöchel, and A. Lendlein, Adv. Mater. 25, 4466 (2013).
M. Behl, K. Kratz, U. Noechel, T. Sauter, and A. Lendlein, Proceedings of the National Academy of Sciences of the United States of America 110, 12555 (2013).
U. Nöchel, C.S. Reddy, N.K. Uttamchand, K. Kratz, M. Behl, and A. Lendlein, European Polymer Journal 49, 2457 (2013).
E.L. Heeley, A.V. Maidens, P.D. Olmsted, W. Bras, I.P. Dolbnya, J.P.A. Fairclough, N.J. Lerrill, and A.J. Ryan, Macromolecules 36, 3656 (2003).
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Nöchel, U., Kratz, K., Behl, M. et al. Relation -between Nanostructural Changes and Macroscopic Effects during Reversible Temperature-Memory Effect under Stress-Free Conditions in Semicrystalline Polymer Networks. MRS Online Proceedings Library 1718, 48–55 (2014). https://doi.org/10.1557/opl.2015.427
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DOI: https://doi.org/10.1557/opl.2015.427