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Jayoti D, Peeketi AR, Kumbhar PY, Swaminathan N, Annabattula RK. Geometry Controlled Oscillations in Liquid Crystal Polymer Films Triggered by Thermal Feedback. ACS APPLIED MATERIALS & INTERFACES 2023; 15:18362-18371. [PMID: 36975405 DOI: 10.1021/acsami.3c02472] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Light-induced oscillatory behavior of liquid crystal polymer network (LCN) films has been demonstrated by several researchers in the past decade. Similarly, oscillations in LCN films under constant thermal stimulus have been reported recently, although the mechanism and the factors that govern the oscillatory behavior are not well understood. In this work, we study the dynamics of self-sustained oscillations exhibited by LCN films under a constant thermal stimulus through experiments and simulations. Geometrically asymmetric films such as a right triangle and an equilateral triangle are obtained from a twisted nematic square film. A multiphysics computational framework using the finite element method is developed to simulate the oscillatory behavior of the LCN films kept on a hot plate. The framework accounts for a coupling between heat transfer and mechanical deformations during the oscillations. Small temperature fluctuations (≈ 1 °C) coupled with gravity induced torque are shown to drive the oscillatory behavior at a specific plate temperature. We show for the first time that self-sustained oscillations can also be achieved in symmetric shapes, such as square films, by creating a thickness tapering between two opposite edges. The frequency of the oscillations is found to be in the range of 0.5 to 2.5 Hz for different geometries studied. The oscillation temperature depends on the mean thickness, size, and thickness profile of the films. As a possible application, we demonstrate a thermally actuated optical chopper using the oscillatory response of the films.
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Affiliation(s)
- Divya Jayoti
- Center for Soft and Biological Matter, Indian Institute of Technology Madras, Chennai 600036, India
- Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai 600036, India
| | - Akhil Reddy Peeketi
- Center for Soft and Biological Matter, Indian Institute of Technology Madras, Chennai 600036, India
- Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai 600036, India
| | - Pramod Yallappa Kumbhar
- Center for Soft and Biological Matter, Indian Institute of Technology Madras, Chennai 600036, India
- Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai 600036, India
| | - Narasimhan Swaminathan
- Center for Soft and Biological Matter, Indian Institute of Technology Madras, Chennai 600036, India
- Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai 600036, India
| | - Ratna Kumar Annabattula
- Center for Soft and Biological Matter, Indian Institute of Technology Madras, Chennai 600036, India
- Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai 600036, India
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Zhang A, Long J, Jia L, Gao Q, Fan H, Xiang J. Self‐healing and reprocess of crosslinked polyurethane based on dynamic oxime‐carbamate bond. J Appl Polym Sci 2022. [DOI: 10.1002/app.53478] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/04/2022]
Affiliation(s)
- Aiqin Zhang
- Key Laboratory of Leather Chemistry and Engineering of Ministry of Education Sichuan University Chengdu China
| | - Jian Long
- Key Laboratory of Leather Chemistry and Engineering of Ministry of Education Sichuan University Chengdu China
| | - Liang Jia
- Key Laboratory of Leather Chemistry and Engineering of Ministry of Education Sichuan University Chengdu China
| | - Qiang Gao
- Key Laboratory of Leather Chemistry and Engineering of Ministry of Education Sichuan University Chengdu China
| | - Haojun Fan
- Key Laboratory of Leather Chemistry and Engineering of Ministry of Education Sichuan University Chengdu China
- State Key Laboratory of Polymer Materials Engineering Sichuan University Chengdu China
| | - Jun Xiang
- Key Laboratory of Leather Chemistry and Engineering of Ministry of Education Sichuan University Chengdu China
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Xiao YY, Jiang ZC, Hou JB, Chen XS, Zhao Y. Electrically driven liquid crystal network actuators. SOFT MATTER 2022; 18:4850-4867. [PMID: 35730498 DOI: 10.1039/d2sm00544a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Soft actuators based on liquid crystal networks (LCNs) have aroused great scientific interest for use as stimuli-controlled shape-changing and moving components for robotic devices due to their fast, large, programmable and solvent-free actuation responses. Recently, various LCN actuators have been implemented in soft robotics using stimulus sources such as heat, light, humidity and chemical reactions. Among them, electrically driven LCN actuators allow easy modulation and programming of the input electrical signals (amplitude, phase, and frequency) as well as stimulation throughout the volume, rendering them promising actuators for practical applications. Herein, the progress of electrically driven LCN actuators regarding their construction, actuation mechanisms, actuation performance, actuation programmability and the design strategies for intelligent systems is elucidated. We also discuss new robotic functions and advanced actuation control. Finally, an outlook is provided, highlighting the research challenges faced with this type of actuator.
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Affiliation(s)
- Yao-Yu Xiao
- Département de Chimie, Université de Sherbrooke, Sherbrooke, Québec, Canada.
| | - Zhi-Chao Jiang
- Département de Chimie, Université de Sherbrooke, Sherbrooke, Québec, Canada.
| | - Jun-Bo Hou
- Département de Chimie, Université de Sherbrooke, Sherbrooke, Québec, Canada.
| | - Xin-Shi Chen
- Département de Chimie, Université de Sherbrooke, Sherbrooke, Québec, Canada.
| | - Yue Zhao
- Département de Chimie, Université de Sherbrooke, Sherbrooke, Québec, Canada.
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Room-Temperature Solid-State UV Cross-Linkable Vitrimer-like Polymers for Additive Manufacturing. Polymers (Basel) 2022; 14:polym14112203. [PMID: 35683876 PMCID: PMC9182850 DOI: 10.3390/polym14112203] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2022] [Revised: 05/24/2022] [Accepted: 05/24/2022] [Indexed: 02/01/2023] Open
Abstract
In this paper, a UV cross-linkable vitrimer-like polymer, ureidopyrimidinone functionalized telechelic polybutadiene, is reported. It is synthesized in two steps. First, 2(6-isocyanatohexylaminocarbonylamino)-6-methyl-4[1H]-pyrimidinone (UPy-NCO) reacts with hydroxy-functionalized polybutadiene (HTPB) to obtain UPy-HTPB-UPy, and then the resulted UPy-HTPB-UPy is cross-linked under 365 nm UV light (photo-initiator: bimethoxy-2-phenylacetophenone, DMPA). Further investigation reveals that the density of cross-linking and mechanical properties of the resulting polymers can be tailored via varying the amount of photo-initiator and UV exposure time. Before UV cross-linking, UPy-HTPB-UPy is found to be vitrimer-like due to the quadruple hydrogen-bonding interactions. The UPy groups at the end of the chain also enable for rapid solidification upon the evaporation of the solvent. The unsaturated double bonds in the HTPB chains enable UPy-HTPB-UPy to be UV cross-linkable in the solid state at room temperature. After cross-linking, the polymers have good shape memory effect (SME). Here, we demonstrate that this type of polymer can have many potential applications in additive manufacturing. In the cases of fused deposition modelling (FDM) and direct ink writing (DIW), not only the strength of the interlayer bonding but also the strength of the polymer itself can be enhanced via UV exposure (from thermoplastic to thermoset) either during printing or after printing. The SME after cross-linking further helps to achieve rapid volumetric additive manufacturing anytime and anywhere.
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Qi X, Wang L, Zhang Y, Jia M, Zhang L, Yue D. Second Natural Rubber with Self-Reinforcing Effect Based on Strain-Induced Crystallization. Macromolecules 2022. [DOI: 10.1021/acs.macromol.1c02646] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Xin Qi
- State Key Laboratory of Organic−Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, P. R. China
- Key Laboratory of Beijing City on Preparation and Processing of Novel Polymer Materials, Beijing 100029, P. R. China
| | - Lin Wang
- State Key Laboratory of Organic−Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, P. R. China
- Key Laboratory of Beijing City on Preparation and Processing of Novel Polymer Materials, Beijing 100029, P. R. China
| | - Yingdong Zhang
- State Key Laboratory of Organic−Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, P. R. China
- Key Laboratory of Beijing City on Preparation and Processing of Novel Polymer Materials, Beijing 100029, P. R. China
| | - Manman Jia
- State Key Laboratory of Organic−Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, P. R. China
- Key Laboratory of Beijing City on Preparation and Processing of Novel Polymer Materials, Beijing 100029, P. R. China
| | - Liqun Zhang
- State Key Laboratory of Organic−Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, P. R. China
- Key Laboratory of Beijing City on Preparation and Processing of Novel Polymer Materials, Beijing 100029, P. R. China
| | - Dongmei Yue
- State Key Laboratory of Organic−Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, P. R. China
- Key Laboratory of Beijing City on Preparation and Processing of Novel Polymer Materials, Beijing 100029, P. R. China
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Gunaydin A, Grysan P, F. Schmidt D, Dieden R, Weydert M, S. Shaplov A. RAFT solution copolymerization of styrene and 1,3-butadiene and its application as a tool for block copolymer preparation. NEW J CHEM 2022. [DOI: 10.1039/d2nj02286a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
For the first time, random copolymers of styrene (St) and 1,3-butadiene (Bd) (poly(Stn-r-Bdm), styrene butadiene rubber, SBR) were prepared via solution RAFT polymerization, that was further extended to produce poly[Xn-b-(Stm-r-Bdk)] block copolymers.
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Affiliation(s)
- Abdullah Gunaydin
- Luxembourg Institute of Science and Technology (LIST), 5 Avenue des Hauts-Fourneaux, L-4362 Esch-sur-Alzette, Luxembourg
- University of Luxembourg, 2 Avenue de l’Université, L-4365 Esch-sur-Alzette, Luxembourg
| | - Patrick Grysan
- Luxembourg Institute of Science and Technology (LIST), 5 Avenue des Hauts-Fourneaux, L-4362 Esch-sur-Alzette, Luxembourg
| | - Daniel F. Schmidt
- Luxembourg Institute of Science and Technology (LIST), 5 Avenue des Hauts-Fourneaux, L-4362 Esch-sur-Alzette, Luxembourg
| | - Reiner Dieden
- Luxembourg Institute of Science and Technology (LIST), 5 Avenue des Hauts-Fourneaux, L-4362 Esch-sur-Alzette, Luxembourg
| | - Marc Weydert
- Goodyear Innovation Center Luxembourg, Avenue Gordon Smith, L-7750 Colmar-Berg, Luxembourg
| | - Alexander S. Shaplov
- Luxembourg Institute of Science and Technology (LIST), 5 Avenue des Hauts-Fourneaux, L-4362 Esch-sur-Alzette, Luxembourg
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Zhang C, Lu X, Wang Z, Xia H. Progress in Utilizing Dynamic Bonds to Fabricate Structurally Adaptive Self-Healing, Shape Memory, and Liquid Crystal Polymers. Macromol Rapid Commun 2021; 43:e2100768. [PMID: 34964192 DOI: 10.1002/marc.202100768] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Revised: 12/15/2021] [Indexed: 11/09/2022]
Abstract
Stimuli-responsive structurally dynamic polymers are capable of mimicking the biological systems to adapt themselves to the surrounding environmental changes and subsequently exhibiting a wide range of responses ranging from self-healing to complex shape-morphing. Dynamic self-healing polymers (SHPs), shape-memory polymers (SMPs) and liquid crystal elastomers (LCEs), which are three representative examples of stimuli-responsive structurally dynamic polymers, have been attracting broad and growing interest in recent years because of their potential applications in the fields of electronic skin, sensors, soft robots, artificial muscles, and so on. We review recent advances and challenges in the developments towards dynamic SHPs, SMPs and LCEs, focusing on the chemistry strategies and the dynamic reaction mechanisms that enhance the performances of the materials including self-healing, reprocessing and reprogramming. We compare and discuss the different dynamic chemistries and their mechanisms on the enhanced functions of the materials, where three summary tables are presented: a library of dynamic bonds and the resulting characteristics of the materials. Finally, we provide a critical outline of the unresolved issues and future perspectives on the emerging developments. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Chun Zhang
- State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute, Sichuan University, Chengdu, 610065, China
| | - Xili Lu
- State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute, Sichuan University, Chengdu, 610065, China
| | - Zhanhua Wang
- State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute, Sichuan University, Chengdu, 610065, China
| | - Hesheng Xia
- State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute, Sichuan University, Chengdu, 610065, China
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Hussain S, Park SY. Photonic Cholesteric Liquid-Crystal Elastomers with Reprogrammable Helical Pitch and Handedness. ACS APPLIED MATERIALS & INTERFACES 2021; 13:59275-59287. [PMID: 34854301 DOI: 10.1021/acsami.1c18697] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
The unique combination of the rubber-like property and the photonic helicoidal structure of cholesteric liquid-crystal elastomers (CLCEs) results in one-handed circular polarized light reflection, the wavelength of which is dictated by the Bragg relationship. Herein, a highly stretchable mechanochromic photonic CLCE film was fabricated by cross-linking mesogenic oligomers having thiol terminal groups, which further reacted to form disulfide (-S-S-) linkages. The mechanically stretched photonic CLCE film reflected both right- and left-handed circular polarized lights with a blue-shifted color. The helicoidal pitch and handedness controlled by the applied strain were programmed through a dynamic exchange reaction between the -S-S- linkages, thus realizing the patterning at selective regions. The pattern almost vanished under unpolarized daylight but was visible under circularly polarized light when the patterned photonic CLCE film had been heated above its isotropic temperature. The hidden patterns of the heat-treated CLCE film reappeared under unpolarized daylight when stretched, demonstrating a data encryption ability. These patterned photonic elastomers can be uniquely used in sensors, actuators, soft robotics, flexible displays, data encryption, and anticounterfeiting applications with a mechanochromic camouflage response.
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Affiliation(s)
- Saddam Hussain
- School of Applied Chemical Engineering, Polymeric Nano Materials Laboratory, Kyungpook National University, Daegu 41566, Republic of Korea
| | - Soo-Young Park
- School of Applied Chemical Engineering, Polymeric Nano Materials Laboratory, Kyungpook National University, Daegu 41566, Republic of Korea
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Lugger SJD, Houben SJA, Foelen Y, Debije MG, Schenning APHJ, Mulder DJ. Hydrogen-Bonded Supramolecular Liquid Crystal Polymers: Smart Materials with Stimuli-Responsive, Self-Healing, and Recyclable Properties. Chem Rev 2021; 122:4946-4975. [PMID: 34428022 PMCID: PMC8915167 DOI: 10.1021/acs.chemrev.1c00330] [Citation(s) in RCA: 83] [Impact Index Per Article: 27.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
![]()
Hydrogen-bonded liquid
crystalline polymers have emerged as promising
“smart” supramolecular functional materials with stimuli-responsive,
self-healing, and recyclable properties. The hydrogen bonds can either
be used as chemically responsive (i.e., pH-responsive) or as dynamic
structural (i.e., temperature-responsive) moieties. Responsiveness
can be manifested as changes in shape, color, or porosity and as selective
binding. The liquid crystalline self-organization gives the materials
their unique responsive nanostructures. Typically, the materials used
for actuators or optical materials are constructed using linear calamitic
(rod-shaped) hydrogen-bonded complexes, while nanoporous materials
are constructed from either calamitic or discotic (disk-shaped) complexes.
The dynamic structural character of the hydrogen bond moieties can
be used to construct self-healing and recyclable supramolecular materials.
In this review, recent findings are summarized, and potential future
applications are discussed.
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Affiliation(s)
- Sean J D Lugger
- Stimuli-responsive Functional Materials and Devices, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, The Netherlands
| | - Simon J A Houben
- Stimuli-responsive Functional Materials and Devices, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, The Netherlands
| | - Yari Foelen
- Stimuli-responsive Functional Materials and Devices, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, The Netherlands
| | - Michael G Debije
- Stimuli-responsive Functional Materials and Devices, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, The Netherlands
| | - Albert P H J Schenning
- Stimuli-responsive Functional Materials and Devices, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, The Netherlands.,SCNU-TUE Joint Laboratory of Device Integrated Responsive Materials (DIRM), South China Normal University, Guangzhou Higher Education Mega Center, 510006 Guangzhou, China.,Institute for Complex Molecular Systems, Eindhoven University of Technology, Den Dolech 2, 5600 MB, Eindhoven, The Netherlands
| | - Dirk J Mulder
- Stimuli-responsive Functional Materials and Devices, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, The Netherlands
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