Azobenzene-functionalized polyimides as wireless actuators

Wie, Jeong Jae; Chatterjee, Sourav; Wang, David H.; Tan, Loon‐Seng; Shankar, M. Ravi; White, Timothy J.

doi:10.1016/j.polymer.2014.06.084

Cited by 25 publications

(17 citation statements)

References 40 publications

(30 reference statements)

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“…Whereas, the X‐ppp‐PMDI with its narrower distribution finds these trapped configurations more quickly. We note that this type of strain persistency in glassy, cross‐linked azo‐polymers has been observed in other systems under polarized blue light as well …”

Section: Resultssupporting

confidence: 77%

Relaxation Dynamics and Strain Persistency of Azobenzene‐Functionalized Polymers and Actuators

Skandani

Chatterjee

Wang

et al. 2017

Macro Materials & Eng

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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/mame.201700256. Azo PolymerThe accumulation of photoinduced deformation in azobenzene functionalized polymers has received a significant amount of attention in recent years. Critically, the induced photomechanical deformation in these systems experiences varying degrees of relaxation. Control over the persistence of photomechanical strains is vital to the broader utility of these materials in shape programmable systems including soft robotics and engineered origami. Furthermore, investigations of relaxation in light responsive polymer systems triggered by UV light are more prominent than those triggered by blue-green light. In this study, the impact of chain mobility and initially induced photostrain on the relaxation dynamics of azobenzene-functionalized polyimides after irradiation with blue light is examined. A modeling effort coupling chromophore population dynamics to material strain is carried out to further explore the relationship between material structure, relaxation dynamics, and macroscopic deformation. The implications for controlling strain persistence are highlighted by simulating one example of a photoprimed bistable actuator. 3 of 11) www.advancedsciencenews.com www.mme-journal.de (

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Section: Resultssupporting

confidence: 77%

Relaxation Dynamics and Strain Persistency of Azobenzene‐Functionalized Polymers and Actuators

Skandani

Chatterjee

Wang

et al. 2017

Macro Materials & Eng

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“…142 Chemically or physically cross-linked supramolecular assemblies of these linear photomechanical polymers may be envisioned to behave as actuators, to lift weights, and to perform other types of work with greater resistance to deformation fatigue than individual strands. 143 For example, Fang et al reported using a simple melt spinning method to fabricate hydrogen-bonded cross-linked fibers of azobenzene-containing main chain polymers that were prepared via a Michael addition reaction ( Figure 10). 144 The authors also investigated the photoinduced mechanical properties of the fibers, reporting a maximum stress generated by a Archimedes' need for a place to stand to move the Earth, a surface may be utilized to instill directionality to harness the power of large numbers of molecular machines.…”

Section: Acs Nanomentioning

confidence: 99%

Controlling Motion at the Nanoscale: Rise of the Molecular Machines

et al. 2015

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As our understanding and control of intra- and intermolecular interactions evolve, ever more complex molecular systems are synthesized and assembled that are capable of performing work or completing sophisticated tasks at the molecular scale. Commonly referred to as molecular machines, these dynamic systems comprise an astonishingly diverse class of motifs and are designed to respond to a plethora of actuation stimuli. In this Review, we outline the conditions that distinguish simple switches and rotors from machines and draw from a variety of fields to highlight some of the most exciting recent examples of opportunities for driven molecular mechanics. Emphasis is placed on the need for controllable and hierarchical assembly of these molecular components to display measurable effects at the micro-, meso-, and macroscales. As in Nature, this strategy will lead to dramatic amplification of the work performed via the collective action of many machines organized in linear chains, on functionalized surfaces, or in three-dimensional assemblies.

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“…The rigid‐chain LCPs of linear structure contained aromatic or heterocyclic fragments are usually obtained by polycondensation or co‐polycondensation of different bifunctional monomers. As a typical example, we note the synthesis of polyimines by polycondensation of diamines or hydrazines with dialdehydes, diketones or quinones . In another interesting example, a liquid crystalline polyazomethine ether with dimethoxybenzylidene side groups was prepared by polycondensation of a diacid monomer of benzalaniline‐3′,4′‐dimethoxy‐terepthalic acid with two diol monomers …”

Section: Liquid Crystal Chelating Polymersmentioning

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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Azobenzene-functionalized polyimides as wireless actuators

Cited by 25 publications

References 40 publications

Relaxation Dynamics and Strain Persistency of Azobenzene‐Functionalized Polymers and Actuators

Relaxation Dynamics and Strain Persistency of Azobenzene‐Functionalized Polymers and Actuators

Controlling Motion at the Nanoscale: Rise of the Molecular Machines

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

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