Synthesis, characterization, and photo‐responsive properties of Y‐shaped amphiphilic azo triblock copolymer

Wei, Renbo; Ma, Jianguo; Zhang, Hongxing; He, Yaning

doi:10.1002/app.43695

Cited by 12 publications

(5 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Interestingly, they also observed a patterned DPM under irradiation with interfering light beams. The materials used for DPM can be based on polyacrylates, ,, polyurethanes, , epoxy-based polymers ,, (with an example with a hollow microsphere), various block copolymers, − or supramolecular systems with poly(4-vinylpyridine) . Wang and coworkers reported a systematic study of the DPM depending on the size of epoxy-based microparticles …”

Section: Motion From Photochromic Molecular Switchesmentioning

confidence: 84%

Design of Collective Motions from Synthetic Molecular Switches, Rotors, and Motors

et al. 2019

View full text Add to dashboard Cite

Precise control over molecular movement is of fundamental and practical importance in physics, biology, and chemistry. At nanoscale, the peculiar functioning principles and the synthesis of individual molecular actuators and machines has been the subject of intense investigations and debates over the past 60 years. In this review, we focus on the design of collective motions that are achieved by integrating, in space and time, several or many of these individual mechanical units together. In particular, we provide an in-depth look at the intermolecular couplings used to physically connect a number of artificial mechanically active molecular units such as photochromic molecular switches, nanomachines based on mechanical bonds, molecular rotors, and light-powered rotary motors. We highlight the various functioning principles that can lead to their collective motion at various length scales. We also emphasize how their synchronized, or desynchronized, mechanical behavior can lead to emerging functional properties and to their implementation into new active devices and materials.

show abstract

Section: Motion From Photochromic Molecular Switchesmentioning

confidence: 84%

Design of Collective Motions from Synthetic Molecular Switches, Rotors, and Motors

et al. 2019

View full text Add to dashboard Cite

show abstract

“…However, the absorption of the abovementioned azobenzene is usually in the range of UV which greatly limits its further application. The pseudo-stilbene azobenzenes which have electron-withdrawing/donating groups on their 4 and 4′ sites are also known as push-pull azobenzenes [27]. Intense absorptions of the azobenzenes are observed in visible light benefiting from the π→π* transition.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Photoinduced Anisotropy of Polymers Containing Nunchaku-Like Unit with an Azobenzene and a Mesogen

et al. 2019

Self Cite

View full text Add to dashboard Cite

A series of polymers containing nunchaku-like unit with an azo chromophore and a mesogen group was successfully prepared and photoinduced anisotropy of the obtained polymers was minutely investigated. Firstly, monomers containing nunchaku-like unit with an azo chromophore and a mesogen group linked by flexible group were synthesized. The structure of the monomers was confirmed via NMR COSY spectra. Subsequently, the obtained monomers were polymerized into corresponding polymers through RAFT polymerization. The prepared polymer samples were characterized through NMR, FTIR, gel permeation chromatography (GPC), and UV-vis testing while the thermal properties of the samples were investigated through differential scanning calorimeter (DSC) and thermogravimetric analysis (TGA) measurements. The photoinduced isomerization of the polymers, which was researched in situ via measuring UV-vis spectra of the polymer solutions and spin-coated films under irradiation with 450 nm light or putting in darkness, demonstrated the rapid trans-cis-trans isomerization of the polymers. When irradiated with a linearly polarized light, significant photoinduced birefringence and dichroism were observed, suggesting photoinduced isomerization of azobenzene can drive orientation of mesogen in the system. This study blazes a way to design the optical materials with light-controllable birefringence and dichroism.

show abstract

“…Stitching induced fiber misalignment angle and heterogonous fiber volume fraction was considered in a fiber distortion model . Stitching fiber in the preform thickness increased impact damage tolerance in where the energy absorption from the stitching fiber fracture work in the preform total fiber volume fraction were predicted .…”

Section: Introductionmentioning

confidence: 99%

In‐plane response of para‐aramid/phenolic nanostitched and nanoprepreg 3D composites under tensile loading

2018

View full text Add to dashboard Cite

The tensile properties of nanostitched and nanoprepreg three dimensional para‐aramid/phenolic composites were studied. The tensile responses of para‐aramid/phenolic composites showed three regions as initial interfiber friction, crimp exchange, and yarn extension regions. Their tensile moduli in each region were defined. It was obtained that stitching and multiwall carbon nanotubes slightly increased the tensile strength of all stitched and stitched/nano composites. Tensile failure on all stitched structure showed brittle matrix and multiple ductile filament breakages in yarn after angular deformation in composite surface layers as well as local restricted delamination. Failure mechanism of carbon stitched composite was interestingly different compared to para‐aramid stitched composite in where carbon stitching yarn was failed in the loop section. It was pulled out thickness direction of the composite and caused large local opening between layers. POLYM. COMPOS., 40:1275–1286, 2019. © 2018 Society of Plastics Engineers

show abstract

Synthesis, characterization, and photo‐responsive properties of Y‐shaped amphiphilic azo triblock copolymer

Cited by 12 publications

References 46 publications

Design of Collective Motions from Synthetic Molecular Switches, Rotors, and Motors

Design of Collective Motions from Synthetic Molecular Switches, Rotors, and Motors

Synthesis and Photoinduced Anisotropy of Polymers Containing Nunchaku-Like Unit with an Azobenzene and a Mesogen

In‐plane response of para‐aramid/phenolic nanostitched and nanoprepreg 3D composites under tensile loading

Contact Info

Product

Resources

About