Physical crosslinking of mesomorphic polymers containing spiropyran groups

Cabrera, Iván; Krongauz, Valeri

doi:10.1021/ma00177a014

Cited by 41 publications

(18 citation statements)

References 4 publications

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“…[2±4] Carbon nanotubes, which are macromolecular carbon structures, could fill this gap because of their nanosize dimensions, fibrous and inherently porous structure, and chemical stability. [5,6] These structures are rolled up graphene sheets (cylinders) collected in the form of ropes (singlewalled nanotube ropes) or concentric Russian-dolls (multiwalled nanotubes). Nanotubes are mechanically and chemically robust and have unique electronic and transport properties depending on the way the carbon atoms are arranged in their cylindrical hexagonal honeycomb lattices.…”

Section: Methodsmentioning

confidence: 99%

“…Nanotubes are mechanically and chemically robust and have unique electronic and transport properties depending on the way the carbon atoms are arranged in their cylindrical hexagonal honeycomb lattices. [6] This material is being developed for applications ranging from microelectronic devices to high performance composites. Multiwalled carbon nanotubes have been made into electrodes recently and their electrochemical electron transfer characteristics have been demonstrated.…”

Section: Methodsmentioning

confidence: 99%

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Photosensitive Cholesteric Copolymers with Spiropyran-Containing Side Groups: Novel Materials for Optical Data Recording

Bobrovsky

Boiko

Shibaev³

1999

Adv. Mater.

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The thermal and chemical reversibility of the photochromic process displayed by spiropyran (see Figure) is combined with the helical supramolecular architecture of a cholesteric polymer to produce a copolymer that can be used for reversible data recording on colored backgrounds. The cholesteric structure is able to reflect a broad spectrum of visible light, which should allow the realization of the special filters and reflectors required for complex multicolor optical display devices.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Photosensitive Cholesteric Copolymers with Spiropyran-Containing Side Groups: Novel Materials for Optical Data Recording

Bobrovsky

Boiko

Shibaev³

1999

Adv. Mater.

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“…7A). Both J-aggregates [91][92][93][94][95][96] and H-aggregates [97][98][99][100] of MC are well known, and occasionally are found to co-exist. 101,102 In addition to its tendency to aggregate, MC can also form complexes with SP units.…”

Section: Aggregation Of the Open-ring Isomermentioning

confidence: 99%

“…A variety of polyacrylates [272][273][274][275] and polysiloxanes 276,277 incorporating both SP and mesogenic units have been synthesised. Although the primary motivation was the development of reversible optical data storage, [278][279][280][281] other fascinating properties, such as transient birefringence 98,282 and second harmonic generation, [283][284][285] have also been observed in these systems. In another study, spiropyran-decorated polyacrylamide hydrogel was used to fill the empty spaces between regularly arranged polystyrene colloidal spheres, giving rise to so-called polymerised crystalline colloidal arrays (PCCAs).…”

Section: Photocontrol Of Other Polymer Propertiesmentioning

confidence: 99%

Spiropyran-based dynamic materials

2014

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In the past few years, spiropyran has emerged as the molecule-of-choice for the construction of novel dynamic materials. This unique molecular switch undergoes structural isomerisation in response to a variety of orthogonal stimuli, e.g. light, temperature, metal ions, redox potential, and mechanical stress. Incorporation of this switch onto macromolecular supports or inorganic scaffolds allows for the creation of robust dynamic materials. This review discusses the synthesis, switching conditions, and use of dynamic materials in which spiropyran has been attached to the surfaces of polymers, biomacromolecules, inorganic nanoparticles, as well as solid surfaces. The resulting materials show fascinating properties whereby the state of the switch intimately affects a multitude of useful properties of the support. The utility of the spiropyran switch will undoubtedly endow these materials with far-reaching applications in the near future.

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“…It is important to point out that the aggregation of NPs took place on account of dipole-dipole interactions between the zwitterionic moieties on different NPs. Alternative mechanism based on the formation of SP-MC complexes 280,281 was ruled out based on the absence of the absorption bands characteristic for these complexes in the UV-Vis spectra. 106 CCl 4 was found to be an ideal solvent for an effective light-induced aggregation behaviour (Fig.…”

Section: Np Aggregation Induced By Light-controlled Molecular Switchesmentioning

confidence: 99%

Nanoparticles functionalised with reversible molecular and supramolecular switches

2010

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Nanoparticles (NPs) and molecular/supramolecular switches have attracted considerable interest during the past decade on account of their unique properties and prominent roles in the fields of organic chemistry and materials science. Materials derived from the combination of these two components are now emerging in the literature. This critical review evaluates materials which comprise NPs functionalised with well-defined self-assembled monolayers of molecular and supramolecular switches. We draw attention to the fact that immobilisation of switches on NPs does not, in general, hamper their switching ability, although it can impart new properties on the supporting particles. This premise leads us to the discussion of systems in which switching on the surfaces of NPs can be used to modulate reversibly a range of NP properties-optical, fluorescent, electrical, magnetic-as well as the controlled release of small molecules. Finally, we discuss examples in which molecular switches direct reversible self-assembly of NPs (308 references).

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Physical crosslinking of mesomorphic polymers containing spiropyran groups

Abstract: 110294-68-3; (A2i3)(B2) (copolymer), 87318-28-3; (A23)(B2) (SRU), 110294-69-4; (A24)(B2) (copolymer), 87318-29-4; (A24)(B2) (SRU),

Cited by 41 publications

References 4 publications

Photosensitive Cholesteric Copolymers with Spiropyran-Containing Side Groups: Novel Materials for Optical Data Recording

Photosensitive Cholesteric Copolymers with Spiropyran-Containing Side Groups: Novel Materials for Optical Data Recording

Spiropyran-based dynamic materials

Nanoparticles functionalised with reversible molecular and supramolecular switches

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