Synthesis and Thermal Properties of Azobenzene Core Polyester Dendrimers with Trityl Groups at the Periphery

Laipniece, Lauma; Kampars, Valdis

doi:10.4028/www.scientific.net/kem.762.171

Cited by 5 publications

(4 citation statements)

References 10 publications

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“…Dendrimers offer well-defined nanoarchitectures with a spherical shape, a high degree of molecular uniformity, and multiple surface functionalities. − Based on these unique structural properties, dendrimers have created many applications for catalysts, sensors, and biomedical materials. − Recently, the strategy of incorporation of photochromic units such as azobenzene chromophores in dendrimers has attained an increasing amount of interest because of the possibilities of creating new photosensitive materials, which are focused on the fields of optical data storage systems, holographic grating, and liquid-crystalline materials. − However, the reversible solid-to-liquid transitions and solar thermal conversion properties of photochromic dendrimers have rarely been reported, which are of great significance for the development of dendrimers in the field of photoswitchable adhesives and coatings and solar thermal fuels.…”

Section: Introductionmentioning

confidence: 99%

Photochromic Dendrimers for Photoswitched Solid-To-Liquid Transitions and Solar Thermal Fuels

Zhang

et al. 2020

ACS Appl. Mater. Interfaces

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Dendrimers are well-defined, highly branched macromolecules that have been widely applied in the fields of catalysis, sensing, and biomedicine. Here, we present a novel multifunctional photochromic dendrimer fabricated through grafting azobenzene units onto dendrimers, which not only enables controlled switching of adhesives and effective repair of coating scratches but also realizes high-performance solar energy storage and on-demand heat release. The switchable adhesives and healable coatings of azobenzene-containing dendrimers are attributed to the reversible solid-to-liquid transitions because trans-isomers and cis-isomers have different glass transition temperatures. The adhesion strengths increase significantly with the increase in dendrimer generations, wherein the adhesion strength of fifth-generation photochromic dendrimers (G5-Azo) can reach up to 1.62 MPa, five times higher than that of pristine azobenzenes. The solar energy storage and heat release of dendrimer solar thermal fuels, the isomers of which possess different chemical energies, can be also enhanced remarkably with the amplification of azobenzene groups on dendrimers. The storage energy density of G5-Azo can reach 59 W h kg −1 , which is much higher than that of pristine azobenzenes (36 W h kg −1 ). The G5-Azo fuels exhibit a 5.2 °C temperature difference between cis-isomers and trans-isomers. These findings provide a new perspective and tremendously attractive avenue for the fabrication of photoswitchable adhesives and coatings and solar thermal fuels with dendrimer structures.

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Section: Introductionmentioning

confidence: 99%

Photochromic Dendrimers for Photoswitched Solid-To-Liquid Transitions and Solar Thermal Fuels

Zhang

et al. 2020

ACS Appl. Mater. Interfaces

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“…As an improvement, a three-layer supramolecular system based on the sandwich between PET-1/Dr and polyester nonwovens functionalized with 3-(aminopropyl)trethoxysilane (APTES) and copper and silver atoms have been successfully applied as anti-bacterial materials. The functionalization of dendrimers with chromophore groups offers the possibility to create photosensitive materials to be used in catalysis, sensing, and biomedicine [ 10 , 11 ]. For example, photochromic dendrimers synthetized through Michael addition reaction between poly(amidoamine) dendrimers with three different generations (G1, G3, and G5) and azo-benzene acrylate (Azo), denoted as Gn-Azo (n = 1, 3 and 5), have been applied in the preparation of photo-switchable adhesives and healable coatings ( Scheme 1 ) [ 12 ].…”

Section: Application Of Dendrimers In the Science Of Materials Fieldmentioning

confidence: 99%

Dendrimeric Structures in the Synthesis of Fine Chemicals

et al. 2021

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Dendrimers are highly branched structures with a defined shape, dimension, and molecular weight. They consist of three major components: the central core, branches, and terminal groups. In recent years, dendrimers have received great attention in medicinal chemistry, diagnostic field, science of materials, electrochemistry, and catalysis. In addition, they are largely applied for the functionalization of biocompatible semiconductors, in gene transfection processes, as well as in the preparation of nano-devices, including heterogeneous catalysts. Here, we describe recent advances in the design and application of dendrimers in catalytic organic and inorganic processes, sustainable and low environmental impact, photosensitive materials, nano-delivery systems, and antiviral agents’ dendrimers.

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“…Newkome‐type dendrimers have a small number of termini. Giant dendrimers, called dentromers, were constructed and decorated, in particular, ferrocene and other redox active groups Phosphorus‐containing dendrimers are widely used CPLs with donor phosphorus atoms .…”

Section: Preparation Of Chelating Dendrimersmentioning

confidence: 99%

“…For example, a dendrimer with a pseudo‐crown ether was obtained, which can chelate Ag(I) and Hg(II) ions . It should be also noted that polyester type dendrimers with azobenzene chromophore in the core and trityl fragments at the periphery are synthesized using divergent approach up to G3 . It turned out that the functionalization of dendrimer periphery has not been completed.…”

Section: Preparation Of Chelating Dendrimersmentioning

confidence: 99%

Synthetic Methodologies for Chelating Polymer Ligands: Recent Advances and Future Development

Джардималиева

Uflyand

2018

ChemistrySelect

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This review summarizes recent progress in synthetic methodologies of chelating polymer ligands such as linear, branched, cross‐linked, grafted polymers, polymer films, liquid crystal polymers, dendrimers, star‐shaped and hyperbranched polymers. The features of methods for producing chelating polymer ligands are considered in detail: free‐radical (co)polymerization, living/controlled radical, metathesis, grafted, chemical oxidized, microwave‐assisted and asymmetric polymerization, electropolymerization, cyclopolymerization, polycondensation, post‐polymerization modification, click chemistry methods and “green” synthesis. The main directions of the development of synthetic chemistry of chelating polymeric ligands are analyzed. The bibliography includes works published in the last five years.

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Synthesis and Thermal Properties of Azobenzene Core Polyester Dendrimers with Trityl Groups at the Periphery

Cited by 5 publications

References 10 publications

Photochromic Dendrimers for Photoswitched Solid-To-Liquid Transitions and Solar Thermal Fuels

Photochromic Dendrimers for Photoswitched Solid-To-Liquid Transitions and Solar Thermal Fuels

Dendrimeric Structures in the Synthesis of Fine Chemicals

Synthetic Methodologies for Chelating Polymer Ligands: Recent Advances and Future Development

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