On the History of Reactive Mesogens: Interview with Dirk J. Broer

Broer, Dirk J.

doi:10.1002/adma.201905144

Cited by 18 publications

(16 citation statements)

References 28 publications

(29 reference statements)

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“…Liquid crystalline monomers are the precursors of polymer networks that retain liquid crystallinity. [ 1–5 ] Functionally, the retention of liquid crystallinity in polymer networks assigns both optical and mechanical anisotropy that has enabled utility as compensation films in displays, [ 6 ] optical elements, [ 7 ] thermal interfaces, [ 8 ] and in health care. [ 9 ] The properties of the polymer networks prepared by the homopolymerization (or copolymerization) [ 10 ] of these typically difunctional liquid crystalline monomers are primarily defined by the degree of crosslinking (e.g., the molecular weight between crosslinks, MW c ) as well as the strength of intermolecular interaction derived from the liquid crystalline precursor(s).…”

Section: Introductionmentioning

confidence: 99%

Molecular Engineering of Mesogenic Constituents Within Liquid Crystalline Elastomers to Sharpen Thermotropic Actuation

McCracken

Donovan

Lynch

et al. 2021

Adv Funct Materials

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Liquid crystalline elastomers (LCE) are stimuli‐responsive materials with a distinguished mechanical response. LCE have been subject to numerous recent functional examinations in robotics, health sciences, and optics. The liquid crystallinity of the elastomeric polymer networks of LCE are largely derived from liquid crystalline monomer precursors. Recent reports have utilized commercially available liquid crystalline diacrylate monomers in chain extension reactions to prepare LCE. These reactions have been largely based on monomeric precursors originally to enhance the and thermal stability of optical films. Here, it is demonstrated that preparing LCE via a liquid crystalline diacrylate with reduced mesogen–mesogen interaction enhances and sharpens the thermotropic actuation of these materials. Robust composition‐response correlations are demonstrated in LCE prepared by three common synthetic methods. The enhanced thermotropic response of LCE prepared from this precursor increases the thermomechanical efficiency by sixfold. Accordingly, this work addresses important limitations in utilizing the thermal response of LCE in robotics, health care, and consumer goods.

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Section: Introductionmentioning

confidence: 99%

Molecular Engineering of Mesogenic Constituents Within Liquid Crystalline Elastomers to Sharpen Thermotropic Actuation

McCracken

Donovan

Lynch

et al. 2021

Adv Funct Materials

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“…Calamitic RMs, LC mesogens modified with crosslinkable chemical end-groups either at one or both ends of the mesogen (Figure 5a), were first developed in the 1980s. [97] A selection of common materials and their names structures and common names of some typical mesogens used in reactive LC research. Full names can be found in Tables S1-S4 in the Supporting Information.…”

Section: Liquid Crystal Network (Lcns) and Elastomers (Lces)mentioning

confidence: 99%

4D Printing of Liquid Crystals: What's Right for Me?

et al. 2021

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The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/adma.202104390.Recent years have seen major advances in the developments of both additive manufacturing concepts and responsive materials. When combined as 4D printing, the process can lead to functional materials and devices for use in health, energy generation, sensing, and soft robots. Among responsive materials, liquid crystals, which can deliver programmed, reversible, rapid responses in both air and underwater, are a prime contender for additive manufacturing, given their ease of use and adaptability to many different applications. In this paper, selected works are compared and analyzed to come to a didactical overview of the liquid crystal-additive manufacturing junction. Reading from front to back gives the reader a comprehensive understanding of the options and challenges in the field, while researchers already experienced in either liquid crystals or additive manufacturing are encouraged to scan through the text to see how they can incorporate additive manufacturing or liquid crystals into their own work. The educational text is closed with proposals for future research in this crossover field.

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“…By overcoming the aforementioned difficulties, the light-responsive LC polymers have the potential to revolutionize the way the smart material systems and devices are conceived to date. 340…”

Section: H 3d Printingmentioning

confidence: 99%

Design and applications of light responsive liquid crystal polymer thin films

Mehta

Peeketi

Liu

et al. 2020

Applied Physics Reviews

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Responding to external stimuli is a trait observed in all living organisms. Modern artificial materials have adopted this profound characteristic, thereby commencing the field of stimuli-responsive systems. Liquid crystal polymers are attractive members of this family of systems owing to the available control on their anisotropic properties capable of generating complex morphologies under external stimuli. Liquid crystal polymer systems have been designed to respond to various stimuli such as heat, light, pH, humidity, and electric and magnetic fields. The attainable shapes and topographies open exciting possibilities for novel applications in a wide range of different fields such as microfluidics, artificial muscles, haptics, and optical functions. The microstructural design of liquid crystal polymers leading to diverse applications is the focus of this review. We conclude by presenting the future prospects and developments in these promising material systems.

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On the History of Reactive Mesogens: Interview with Dirk J. Broer

Cited by 18 publications

References 28 publications

Molecular Engineering of Mesogenic Constituents Within Liquid Crystalline Elastomers to Sharpen Thermotropic Actuation

Molecular Engineering of Mesogenic Constituents Within Liquid Crystalline Elastomers to Sharpen Thermotropic Actuation

4D Printing of Liquid Crystals: What's Right for Me?

Design and applications of light responsive liquid crystal polymer thin films

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