Optically and thermally activated shape memory supramolecular liquid crystalline polymers

2016 ◽  
Vol 4 (22) ◽  
pp. 4946-4953 ◽  
Author(s):  
Shangyi Fu ◽  
Hu Zhang ◽  
Yue Zhao
Keyword(s):  
Shape Memory ◽  
Liquid Crystalline ◽  
Uv Light ◽  
Crystalline Polymer ◽  
Crystalline Polymers ◽  
Thermally Activated ◽  
Azobenzene Mesogens ◽  
Triple Shape Memory ◽  
Spatiotemporal Control ◽  
Polymer Bearing

A supramolecular side-chain liquid crystalline polymer bearing azobenzene mesogens exhibits not only the triple-shape memory effect but also UV light-enabled spatiotemporal control of shape recovery.

Structure-property relations of liquid crystalline polymers

1987 ◽  
Vol 45 ◽  
pp. 460-463
Author(s):  
Linda C. Sawyer
Keyword(s):  
Solid State ◽  
Liquid Crystalline ◽  
Structural Model ◽  
Crystalline Polymer ◽  
Liquid Crystalline Polymers ◽  
Mechanical Anisotropy ◽  
Structure Property ◽  
Preparation Methods ◽  
Crystalline Polymers ◽  
Extended Chain

Recent liquid crystalline polymer (LCP) research has sought to define structure-property relationships of these complex new materials. The two major types of LCPs, thermotropic and lyotropic LCPs, both exhibit effects of process history on the microstructure frozen into the solid state. The high mechanical anisotropy of the molecules favors formation of complex structures. Microscopy has been used to develop an understanding of these microstructures and to describe them in a fundamental structural model. Preparation methods used include microtomy, etching, fracture and sonication for study by optical and electron microscopy techniques, which have been described for polymers. The model accounts for the macrostructures and microstructures observed in highly oriented fibers and films.Rod-like liquid crystalline polymers produce oriented materials because they have extended chain structures in the solid state. These polymers have found application as high modulus fibers and films with unique properties due to the formation of ordered solutions (lyotropic) or melts (thermotropic) which transform easily into highly oriented, extended chain structures in the solid state.

scholarly journals Engineering Achiral Liquid Crystalline Polymers for Chiral Self-Recovery

2021 ◽  
Vol 22 (21) ◽  
pp. 11980
Author(s):  
Tengfei Miao ◽  
Xiaoxiao Cheng ◽  
Yilin Qian ◽  
Yaling Zhuang ◽  
Wei Zhang
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystalline ◽  
Uv Light ◽  
Helical Structure ◽  
Side Chain ◽  
Liquid Crystal Polymers ◽  
Polymeric Liquid ◽  
Crystalline Polymers ◽  
Liquid Crystal System ◽  
And Storage

Flexible construction of permanently stored supramolecular chirality with stimulus-responsiveness remains a big challenge. Herein, we describe an efficient method to realize the transfer and storage of chirality in intrinsically achiral films of a side-chain polymeric liquid crystal system by combining chiral doping and cross-linking strategy. Even the helical structure was destroyed by UV light irradiation, the memorized chiral information in the covalent network enabled complete self-recovery of the original chiral superstructure. These results allowed the building of a novel chiroptical switch without any additional chiral source in multiple types of liquid crystal polymers, which may be one of the competitive candidates for use in stimulus-responsive chiro-optical devices.

scholarly journals Observation of transition cascades in sheared liquid crystalline polymers

Soft Matter ◽  
2020 ◽  
Vol 16 (16) ◽  
pp. 3891-3901 ◽  
Author(s):  
Ryan J. Fox ◽  
M. Gregory Forest ◽  
Stephen J. Picken ◽  
Theo J. Dingemans
Keyword(s):  
Liquid Crystalline Polymer ◽  
Liquid Crystalline ◽  
Shear Thickening ◽  
Crystalline Polymer ◽  
Liquid Crystalline Polymers ◽  
Crystalline Polymers ◽  
Nematic Director ◽  
Thickening Behavior

We observe anomalous shear thickening behavior of a lyotropic liquid crystalline polymer due to the dynamics of the nematic director.

Research and Development of Functional Fluid Mechatronics, Rehabilitation Systems, and Mechatronics of Flexible Drive Systems

2016 ◽  
Vol 28 (1) ◽  
pp. 5-16 ◽  
Author(s):  
Junji Furusho ◽  
◽  
Naoyuki Takesue ◽  
Keyword(s):  
Research And Development ◽  
Liquid Crystalline Polymer ◽  
Liquid Crystalline ◽  
Crystalline Polymer ◽  
Liquid Crystalline Polymers ◽  
Magnetorheological Fluid ◽  
Servo Drive ◽  
Crystalline Polymers ◽  
Upper And Lower Extremities ◽  
Drive Systems

[abstFig src='/00280001/01.jpg' width=""260"" text='PLEMO-P3 Developed by Furusho Lab at Osaka Univ.' ]We conducted many research and development activities on functional fluid mechatronics, rehabilitation systems, and servo drive systems. In this review, studies on the development of magnetorheological fluid devices, electrorheological effects of liquid crystalline polymers on one-sided pattern electrodes, and vibration control using control theory and liquid crystalline polymer are introduced. In addition, applications of rehabilitation systems for upper and lower extremities employing functional fluids for individuals suffering from stroke, cerebellar ataxia, and Guillain-Barre syndrome are also introduced.

Elaborate fabrication of well-defined side-chain liquid crystalline polyurethane networks with triple-shape memory capacity

2015 ◽  
Vol 3 (25) ◽  
pp. 13435-13444 ◽  
Author(s):  
Zhibin Wen ◽  
Tianhao Zhang ◽  
Yan Hui ◽  
Wanli Wang ◽  
Keke Yang ◽  
...  
Keyword(s):  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Liquid Crystalline ◽  
Memory Capacity ◽  
Side Chain ◽  
Thermal Transition ◽  
Transition Temperatures ◽  
Polyurethane Networks ◽  
Triple Shape Memory

A series of side-chain liquid crystalline polyurethane networks (SCLCPU-Ns) with well-defined architecture are prepared via an elaborate strategy. The SCLCPU-Ns display dual thermal transition temperatures (Tg and Tcl), which can be utilized as Ttrans to trigger the triple shape memory effect.

Light-activated shape memory of glassy, azobenzene liquid crystalline polymer networks

Soft Matter ◽  
2011 ◽  
Vol 7 (9) ◽  
pp. 4318 ◽  
Author(s):  
Kyung Min Lee ◽  
Hilmar Koerner ◽  
Richard A. Vaia ◽  
Timothy J. Bunning ◽  
Timothy J. White
Keyword(s):  
Shape Memory ◽  
Liquid Crystalline Polymer ◽  
Liquid Crystalline ◽  
Polymer Networks ◽  
Crystalline Polymer

scholarly journals The Effect of 4-Octyldecyloxybenzoic Acid on Liquid-Crystalline Polyurethane Composites with Triple-Shape Memory and Self-Healing Properties

2016 ◽  
Author(s):  
Jianfeng Ban ◽  
Linjiang Zhu ◽  
Shaojun Chen ◽  
Yiping Wang
Keyword(s):  
Shape Memory ◽  
Liquid Crystalline ◽  
Crystallization Rate ◽  
Self Healing ◽  
Two Phase ◽  
Structure Morphology ◽  
Shape Memory Properties ◽  
Triple Shape Memory ◽  
Polyurethane Composites ◽  
Shape Memory Polyurethane

To better understand the shape memory materials and self-healing materials, a new series of liquid-crystalline shape memory polyurethane (LC-SMPU) composites, named SMPU-OOBAm, were successfully prepared by incorporating 4-octyldecyloxybenzoic acid (OOBA) into the PEG-based SMPU. The effect of OOBA on the structure, morphology and properties has been carefully investigated. The results demonstrate that SMPU-OOBAm have liquid crystalline properties, triple-shape memory properties and self-healing properties. The incorporated OOBA promotes the crystallizability of both soft and hard segments of SMPU, and the crystallization rate of the hard segment of SMPU decreases when the OOBA-content increases. Additionally, the SMPU-OOBAm forms a two-phase separated structure (SMPU phase and OOBA phase), and it shows two-step modulus changes upon heating. Therefore, the SMPU-OOBAm shows triple-shape memory behavior, and the shape recovery ratio decreases with an increase in the OOBA content. Finally, SMPU-OOBAm shows self-healing properties. The new mechanism can be ascribed to the heating-induced “bleeding” of OOBA in the liquid crystalline state and the subsequent re-crystallization upon cooling. This successful combination of liquid crystalline properties, triple-shape memory properties and self-healing properties make the SMPU-OOBAm composites with many promise applications in smart optical devices, smart electronic devices and smart sensors.

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