Controlled Shape Memory Behavior of a Smectic Main-Chain Liquid Crystalline Elastomer

Li, Yuzhan; Pruitt, Cole; Rios, Orlando; Wei, Liqing; Rock, Mitch; Keum, Jong K.; McDonald, Armando G.; Kessler, Michael R.

doi:10.1021/acs.macromol.5b00519

Controlled Shape Memory Behavior of a Smectic Main-Chain Liquid Crystalline Elastomer

Journal Article · Fri Apr 10 00:00:00 EDT 2015 · Macromolecules

DOI:https://doi.org/10.1021/acs.macromol.5b00519· OSTI ID:1324048

Li, Yuzhan ^[1]; Pruitt, Cole ^[1]; Rios, Orlando ^[2]; Wei, Liqing ^[3]; Rock, Mitch ^[1]; Keum, Jong K. ^[4]; McDonald, Armando G. ^[3]; Kessler, Michael R. ^[1]

Washington State Univ., Pullman, WA (United States). School of Mechanical and Materials Engineering
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Deposition Sciences Group
Univ. of Idaho, Moscow, ID (United States). Dept. of Forest, Rangeland and Fire Sciences
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science (CNMS)

Here, we describe how a smectic main-chain liquid crystalline elastomer (LCE), with controlled shape memory behavior, is synthesized by polymerizing a biphenyl-based epoxy monomer with an aliphatic carboxylic acid curing agent. Microstructures of the LCEs, including their liquid crystallinity and cross-linking density, are modified by adjusting the stoichiometric ratio of the reactants to tailor the thermomechanical properties and shape memory behavior of the material. Thermal and liquid crystalline properties of the LCEs, characterized using differential scanning calorimetry and dynamic mechanical analysis, and structural analysis, performed using small-angle and wide-angle X-ray scattering, show that liquid crystallinity, cross-linking density, and network rigidity are strongly affected by the stoichiometry of the curing reaction. With appropriate structural modifications it is possible to tune the thermal, dynamic mechanical, and thermomechanical properties as well as the shape memory and thermal degradation behavior of LCEs.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS); Manufacturing Demonstration Facility (MDF); Critical Materials Institute (CMI)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE); Air Force Office of Scientific Research

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1324048

Journal Information:: Macromolecules, Journal Name: Macromolecules Journal Issue: 9 Vol. 48; ISSN 0024-9297

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Thiol-acrylate main-chain liquid-crystalline elastomers with tunable thermomechanical properties and actuation strain Saed, Mohand O.; Torbati, Amir H.; Starr, Chelsea A. Journal of Polymer Science Part B: Polymer Physics, Vol. 55, Issue 2 https://doi.org/10.1002/polb.24249	journal	October 2016
Liquid crystal elastomer actuators: Synthesis, alignment, and applications Kularatne, Ruvini S.; Kim, Hyun; Boothby, Jennifer M. Journal of Polymer Science Part B: Polymer Physics, Vol. 55, Issue 5 https://doi.org/10.1002/polb.24287	journal	January 2017
Optically and thermally activated shape memory supramolecular liquid crystalline polymers Fu, Shangyi; Zhang, Hu; Zhao, Yue Journal of Materials Chemistry C, Vol. 4, Issue 22 https://doi.org/10.1039/c6tc00718j	journal	January 2016
Liquid crystalline networks based on photo-initiated thiol–ene click chemistry Li, Yuzhan; Zhang, Yuehong; Goswami, Monojoy Soft Matter, Vol. 16, Issue 7 https://doi.org/10.1039/c9sm01818b	journal	January 2020
Synthesis and characterisation of biodegradable liquid crystal elastomer with the property of shape recovery Xu, Mingyao; Cong, Yuehua; Zhang, Baoyan Liquid Crystals, Vol. 44, Issue 11 https://doi.org/10.1080/02678292.2017.1308022	journal	March 2017
Motion control in free-standing shape-memory actuators Belmonte, Alberto; Lama, Giuseppe C.; Cerruti, Pierfrancesco Smart Materials and Structures, Vol. 27, Issue 7 https://doi.org/10.1088/1361-665x/aac278	journal	May 2018

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