Liquid Crystal Polymer Networks: Preparation, Properties, and Applications of Films with Patterned Molecular Alignment

Liu, Danqing; Broer, Dirk J.

doi:10.1021/la500454d

Cited by 207 publications

(199 citation statements)

References 45 publications

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“…Once achieving the desired alignment, the monomeric mixture can be photopolymerized. Because of the average polyfunctionality of the chosen monomers, this leads to cross-linked liquid crystal polymer networks [102]. The ability to design and fabricate the anisotropic coating to respond to specific commands leads to the creation of many different directed topographies.…”

Section: Light-induced Permanent Surface Topographies In Azo Cross-limentioning

confidence: 99%

Light-Triggered Formation of Surface Topographies in Azo Polymers

et al. 2017

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Properties such as friction, wettability and visual impact of polymer coatings are influenced by the surface topography. Therefore, control of the surface structure is of eminent importance to tuning its function. Photochromic azobenzene-containing polymers are an appealing class of coatings of which the surface topography is controllable by light. The topographies form without the use of a solvent, and can be designed to remain static or have dynamic properties, that is, be capable of reversibly switching between different states. The topographical changes can be induced by using linear azo polymers to produce surface-relief gratings. With the ability to address specific regions, interference patterns can imprint a variety of structures. These topographies can be used for nanopatterning, lithography or diffractive optics. For cross-linked polymer networks containing azobenzene moieties, the coatings can form topographies that disappear as soon as the light trigger is switched off. This allows the use of topography-forming coatings in a wide range of applications, ranging from optics to self-cleaning, robotics or haptics.

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Section: Light-induced Permanent Surface Topographies In Azo Cross-limentioning

confidence: 99%

Light-Triggered Formation of Surface Topographies in Azo Polymers

et al. 2017

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“…Mesophases can be locked into a polymer network by making use of polymerizable LCs [59]. These molecules contain moieties such as acryloyl, diacetylenic, and diene.…”

Section: Hydrogen Bonding In Liquid Crystals As Nanoporous Networkmentioning

confidence: 99%

Hydrogen Bonding in Supramolecular Nanoporous Materials

Kuringen¹,

Schenning

2015

Lecture Notes in Chemistry

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This chapter provides an overview of the use of hydrogen bonds for the construction of nanoporous materials. These materials attract a great deal of interest because of their large surface area to volume ratio and their applications in areas such as filtration, separation, adsorption, catalysis, and ion conduction. Organic materials are especially appealing for these applications, because their properties can be tailored. The use of supramolecular interactions is required to control the organization of materials at the molecular level. Hydrogen bonds are ideal supramolecular interactions for the construction of these nanoporous materials, thanks to their directionality and reversibility. The directionality causes the positioning molecules in such a way that voids have been created in between the molecules, such as in two-and three-dimensional hydrogen bonded organic frameworks. In a second approach, hydrogen bonded template molecules have been removed from a polymer to create pores. This method is successfully applied to hydrogen bonded block copolymers and liquid crystalline polymers.

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“…21 Until now, the majority of light-responsive actuators consist of aligning liquid-crystalline azobenzene moieties with one orientation in flexible matrices to obtain a controllable bending direction. [22][23][24][25] However, cumbersome synthetic routes are required to prepare these complex liquid-crystalline azobenzene moieties. To address this problem, using a bilayer actuator is an effective method to realize a controllable bending direction via facilely casting the light-responsive polymer as an active layer on a passive layer.…”

Section: Introductionmentioning

confidence: 99%

UV-triggered shape-controllable PP fabric

2018

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A light-driven polypropylene (PP) fabric as an actuator was fabricated in which a light-responsive polymeric film acts as an active layer and a PP fabric acts as a passive layer. For this, poly [di(ethylene glycol) methyl ether methacrylate-co-pentafluorophenyl acrylate] P(DEGMA-co-PFPA) containing reactive pentafluorophenyl esters was synthesized as a precursor polymer. Owing to the highly reactive esters on P(DEGMA-co-PFPA), photoactive azobenzene moieties were introduced onto the polymer backbone via a post-modification polymerization strategy to form a light-responsive polymer, poly[di(ethylene glycol) methyl ether methacrylate-co-4-(4-methoxy-phenylazo) acrylate] (P(DEGMA-co-MOPAzo)).Interestingly, this copolymer can be attached in a simple and stable manner to the surface of a PP fabric via physical adsorption to build a light-responsive PP fabric. On account of its light responsiveness, this functional polymer PP fabric can immediately respond to a UV stimulus and show a reversible shape transition upon alternating exposure to UV irradiation and the addition of heat.

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Liquid Crystal Polymer Networks: Preparation, Properties, and Applications of Films with Patterned Molecular Alignment

Cited by 207 publications

References 45 publications

Light-Triggered Formation of Surface Topographies in Azo Polymers

Light-Triggered Formation of Surface Topographies in Azo Polymers

Hydrogen Bonding in Supramolecular Nanoporous Materials

UV-triggered shape-controllable PP fabric

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