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Spontaneous thermal expansion of nematic elastomers
Open accessAbstract
Abstract:We study the monodomain (single-crystal) nematic elastomer materials, all side-chain siloxane polymers with the same mesogenic groups and crosslinking density, but differing in the type of crosslinking. Increasing the proportion of long di-functional segments of main-chain nematic polymer, acting as network crosslinking, results in dramatic changes in the uniaxial equilibrium thermal expansion on cooling from the isotropic phase. At higher concentration of main chains their behaviour dominates the elastomer properties. At low concentration of main-chain material, we detect two distinct transitions at different temperatures, one attributed to the main-chain, the other to the side-chain component. The effective uniaxial anisotropy of nematic rubber, r(T) = / proportional to the effective nematic order parameter Q(T), is given by an average of the two components and thus reflects the two-transition nature of thermal expansion. The experimental data is compared with the theoretical model of ideal nematic elastomers; applications in high-amplitude thermal actuators are discussed in the end.
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Citations
Cited by
Zhao, Q., Qi, H. J., & Xie, T. (2015) · Progress in Polymer Science · doi:10.1016/j.progpolymsci.2015.04.001 · Cited by 1,409
Liquid crystalline elastomers as actuators and sensors
Ohm, C., Brehmer, M., & Zentel, R. (2010) · Advanced Materials · doi:10.1002/adma.200904059 · Cited by 1,169
3D printing of liquid crystal elastomeric actuators with spatially programed nematic order
Kotikian, A., Truby, R. L., Boley, J. W., White, T. J., & Lewis, J. A. (2018) · Advanced Materials · doi:10.1002/adma.201706164 · Cited by 768
Two-Way Reversible Shape Memory in a Semicrystalline Network
Chung, T., Romo-Uribe, A., & Mather, P. T. (2008) · Macromolecules · doi:10.1021/ma071517z · Cited by 531
Four-dimensional printing of liquid crystal elastomers
Ambulo, C. P., Burroughs, J. J., Boothby, J. M., Kim, H., Shankar, M. R., & Ware, T. H. (2017) · ACS Applied Materials & Interfaces · doi:10.1021/acsami.7b11851 · Cited by 508
Metadata
- Authors
- Tajbakhsh, A. R., & Terentjev, E. M.
- Venue
- The European Physical Journal E
- Published
- 2001-10
- Volume
- 6
- Issue
- 2
- Pages
- 181-188
- ISSN
- 1292-8941 (ISSN-L)
- OpenAlex
- W1994249848
- Cited by
- 254
- References
- 0
- FWCI
- 5.70
- Type
- journal article
- Language
- en
- Open access
- green
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- Tajbakhsh, A. R., & Terentjev, E. M. (2001). Spontaneous thermal expansion of nematic elastomers. The European Physical Journal E. https://doi.org/10.1007/s101890170020
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