Making and Remaking Dynamic 3D Structures by Shining Light on Flat Liquid Crystalline Vitrimer Films without a Mold

Yang, Yang; Pei, Zhiqiang; Li, Zhen; Wei, Yen; Ji, Yan

doi:10.1021/jacs.5b12531

Cited by 367 publications

(294 citation statements)

References 37 publications

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“…Carbon nanotubes (CNTs) have many excellent performances as novel 1D nanomaterials, such as electrical conductivity, mechanical property, and thermal conductivity . Most important of all, CNTs can absorb NIR light and generate a large amount of heat . So CNTs as a kind of functional filler have attracted more and more attention of researchers …”

Section: Introductionmentioning

confidence: 99%

Carbon Nanotubes‐Polyurethane Vitrimer Nanocomposites with the Ability of Surface Welding Controlled by Heat and Near‐Infrared Light

Yan

Zhao

Wang

et al. 2017

Macro Chemistry & Physics

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Welding technology of polymer materials, serving as an exceedingly good tactics to save materials, reduce cost, and reduce material loss, is only extensively applied in thermoplastic materials for the moment. Recently, a new class of polymer, known as vitrimer, has attracted the eye of researchers because it realizes the reprocessing and reshape of thermosets and possesses many excellent functions, such as multishape memory, healing, and surface welding. Among these, the vitrimer makes the surface welding of thermosetting material possible. In this paper, carbon nanotubes‐polyurethane vitrimer nanocomposites with the capability of surface welding controlled by heat and near‐infrared (NIR) light are successfully prepared. Here, the effects of surface welding are characterized by lap shear tests and optical microscope. In addition, from the control experiments, it is found that the shear strength of the light‐welding sample under NIR illumination for 1 min is greater than that of the heat‐welding sample at 110 °C for 10 min. Furthermore, thermosetting polyurethane has been applied in many fields, and it is hoped that the findings, especially near‐infrared welding technology, will make some contributions for welding technology of polymer.

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Section: Introductionmentioning

confidence: 99%

Carbon Nanotubes‐Polyurethane Vitrimer Nanocomposites with the Ability of Surface Welding Controlled by Heat and Near‐Infrared Light

Yan

Zhao

Wang

et al. 2017

Macro Chemistry & Physics

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“…For instance, this material can be aligned using uniaxial stress to obtain monodomain LCEs or molded against a surface to generate complex surface relief. Using a similar chemistry, a number of actuators capable of complex shape change were later demonstrated . So far we have reviewed the synthetic routes and alignment techniques exploited by research groups to harness the unique properties of LCEs.…”

Section: Synthesis and Alignment Of Lcesmentioning

confidence: 99%

Liquid crystal elastomer actuators: Synthesis, alignment, and applications

Kularatne

Kim

Boothby

et al. 2017

J Polym Sci B Polym Phys

307

232

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Liquid crystal elastomers (LCEs) are a unique class of materials which combine rubber elasticity with the orientational order of liquid crystals. This combination can lead to materials with unique properties such as thermal actuation, anisotropic swelling, and soft elasticity. As such, LCEs are a promising class of materials for applications requiring stimulus response. These unique features and the recent developments of the LCE chemistry and processing will be discussed in this review. First, we emphasize several different synthetic pathways in conjunction with the alignment techniques utilized to obtain monodomain LCEs. We then identify the synthesis and alignment techniques used to synthesis LCE-based composites. Finally, we discuss how these materials are used as actuators and sensors.

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“…Concurrent to the examinations detailed here, a parallel community has developed focused on so‐called “covalent adaptive networks.” These materials are also crosslinked and have functional groups that allow for bond breaking and reformation. Recently, the two communities have begun to merge evident in a number of recent reports …”

Section: Outlook and Conclusionmentioning

confidence: 99%

“…A number of other groups have reported on a variety of reaction chemistries in the recent literature . Many recent papers also report on chemistries with reconfigurable covalent and adaptive networks and employ them to post‐process the material after preparation …”

Section: Introductionmentioning

confidence: 99%

Photomechanical effects in liquid crystalline polymer networks and elastomers

White

2018

J Polym Sci B Polym Phys

103

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Liquid crystals are widely employed as stimuliresponsive materials. Liquid crystallinity can be retained in polymeric form. Photoinduced mechanical effects in liquid crystalline polymer networks and elastomers have been a topic of considerable recent research. This review details the historical underpinnings and recent advances in the synthesis and the corresponding photomechanical response of these materials. In nearly all cases, the conversion of light into mechanical work has employed azobenzene as either a guest additive or covalently attached to the network. V C 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2018, 56, 695-705 KEYWORDS: azobenzene; liquid crystal; liquid crystal elastomer; liquid crystal polymer; photochemistry; shape change; shape programing INTRODUCTION Liquid crystalline materials are synonymous with their use in the displays that surround us in our daily lives. The widespread application of liquid crystals in display applications is enabled by their unique assimilation of properties: the long range fluidity of liquids combined with the anisotropic optical properties of crystalline solids. In displays, the relationship of orientation of the liquid crystal director and birefringence has been leveraged by concurrent advances in thin film transistors to locally control the transmission and spectral output (color) of light visualized in a pixel. The display community, in response to seemingly insatiable consumer demand, is currently focused on improvements in resolution and speed as well as realization of flexible form factors.

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Making and Remaking Dynamic 3D Structures by Shining Light on Flat Liquid Crystalline Vitrimer Films without a Mold

Cited by 367 publications

References 37 publications

Carbon Nanotubes‐Polyurethane Vitrimer Nanocomposites with the Ability of Surface Welding Controlled by Heat and Near‐Infrared Light

Carbon Nanotubes‐Polyurethane Vitrimer Nanocomposites with the Ability of Surface Welding Controlled by Heat and Near‐Infrared Light

Liquid crystal elastomer actuators: Synthesis, alignment, and applications

Photomechanical effects in liquid crystalline polymer networks and elastomers

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