Liquid crystalline epoxy networks with exchangeable disulfide bonds

Li, Yuzhan; Zhang, Yuehong; Rios, Orlando; Keum, Jong K.; Kessler, Michael R.

doi:10.1039/C7SM00934H

Title: Liquid crystalline epoxy networks with exchangeable disulfide bonds

Journal Article · Fri Jun 09 04:00:00 UTC 2017 · Soft Matter

DOI: https://doi.org/10.1039/C7SM00934H · OSTI ID:1399941

Li, Yuzhan ^[1]; Zhang, Yuehong ^[1];

^[2];

^[3]

Washington State Univ., Pullman, WA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Washington State Univ., Pullman, WA (United States); North Dakota State Univ., Fargo, ND (United States)

In this study, a liquid crystalline epoxy network (LCEN) with exchangeable disulfide bonds is synthesized by polymerizing a biphenyl-based epoxy monomer with an aliphatic dicarboxylic acid curing agent containing a disulfide bond. The effect of disulfide bonds on curing behavior and liquid crystalline (LC) phase formation of the LCEN is investigated. The presence of the disulfide bonds results in an increase in the reaction rate, leading to a reduction in liquid crystallinity of the LCEN. In order to promote LC phase formation and stabilize the self-assembled LC domains, a similar aliphatic dicarboxylic acid without the disulfide bond is used as a co-curing agent to reduce the amount of exchangeable disulfide bonds in the system. After optimizing the molar ratio of the two curing agents, the resulting LCEN exhibits improved reprocessability and recyclability because of the disulfide exchange reactions, while preserving LC properties, such as the reversible LC phase transition and macroscopic LC orientation, for shape memory applications.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Advanced Manufacturing Office (EE-5A); USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1399941

Journal Information:: Soft Matter, Journal Name: Soft Matter Journal Issue: 29 Vol. 13; ISSN SMOABF; ISSN 1744-683X

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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