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Molecules
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Photoresponsive Polymers
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Photoresponsive Polymers

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Photochemistry".

Deadline for manuscript submissions: closed (30 April 2017) | Viewed by 16578

Special Issue Editors

Prof. Dr. Haifeng Yu

E-Mail Website
Guest Editor
School of Materials Science and Engineering, Peking University, Beijing 100871, China
Interests: LC soft materials; LC and polymer composites; light-responsive materials; supramolecular assembled materials; biomimetic soft mater; soft robotic
Special Issues, Collections and Topics in MDPI journals
Dr. Arri Priimägi

E-Mail Website
Guest Editor
Department of Chemistry and Bioengineering, Tampere University of Technology, 541, 33101 Tampere, Finland
Interests: functional soft materials; photonics; supramolecular self-assemblies
Prof. Dr. Xiaogong Wang

E-Mail Website
Guest Editor
Laboratory of Advanced Materials (MOE), Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
Interests: azo polymers; photo-responsive; self-assembly; liquid crystal polymers

Special Issue Information

Dear Colleagues,

It is our great pleasure to invite you to submit an article for a high-profile Special Issue on “Photoresponsive Polymers” to be published in Molecules. This Special Issue aims to highlight research on light-induced chemical and physical processes of polymeric and polymer-based composite materials in both the bulk films and solutions. This includes, but is not limited to, new experimental and theoretical methodologies in highly interdisciplinary areas, such as photochemistry, photophysics, photocontrolled material processing and applications. Reviews, research articles and perspectives from experts in the field are equally welcome.

Prof. Dr. Haifeng Yu
Dr. Arri Priimägi
Prof. Dr. Xiaogong Wang
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Molecules is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • photoresponsive polymers and composites
  • photoalignment in polymer materials
  • light-driven soft matters
  • light-controllable nanoassemblies
  • applications of photoresponsive materials
  • photo patterning
  • photomechanical materials
  • photodynamic materials
  • light-responsive materials in solution
  • photoactive molecular materials
  • photoresponsive supramolecules
  • light-active block copolymer and self-assembly
  • holographic recording
  • photonic materials

Published Papers (3 papers)

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Research

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1790 KiB  
Article
Surface-Relief Gratings in Halogen-Bonded Polymer–Azobenzene Complexes: A Concentration-Dependence Study
by Jelle E. Stumpel, Marco Saccone, Valentina Dichiarante, Ossi Lehtonen, Matti Virkki, Pierangelo Metrangolo and Arri Priimagi
Molecules 2017, 22(11), 1844; https://doi.org/10.3390/molecules22111844 - 28 Oct 2017
Cited by 12 | Viewed by 4218
Abstract
In recent years, supramolecular complexes comprising a poly(4-vinylpyridine) backbone and azobenzene-based halogen bond donors have emerged as a promising class of materials for the inscription of light-induced surface-relief gratings (SRGs). The studies up to date have focused on building supramolecular hierarchies, i.e., optimizing [...] Read more.
In recent years, supramolecular complexes comprising a poly(4-vinylpyridine) backbone and azobenzene-based halogen bond donors have emerged as a promising class of materials for the inscription of light-induced surface-relief gratings (SRGs). The studies up to date have focused on building supramolecular hierarchies, i.e., optimizing the polymer–azobenzene noncovalent interaction for efficient surface patterning. They have been conducted using systems with relatively low azobenzene content, and little is known about the concentration dependence of SRG formation in halogen-bonded polymer–azobenzene complexes. Herein, we bridge this gap, and study the concentration dependence of SRG formation using two halogen-bond-donating azobenzene derivatives, one functionalized with a tetrafluoroiodophenyl and the other with an iodoethynylphenyl group. Both have been previously identified as efficient molecules in driving the SRG formation. We cover a broad concentration range, starting from 10 mol % azobenzene content and going all the way up to equimolar degree of complexation. The complexes are studied as spin-coated thin films, and analyzed by optical microscopy, atomic force microscopy, and optical diffraction arising during the SRG formation. We obtained diffraction efficiencies as high as 35%, and modulation depths close to 400 nm, which are significantly higher than the values previously reported for halogen-bonded polymer–azobenzene complexes. Full article
(This article belongs to the Special Issue Photoresponsive Polymers)
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3028 KiB  
Article
Acceptor Side-Chain Effects on the Excited State Dynamics of Two-Dimensional-Like Conjugated Copolymers in Solution
by Ming-Ming Huo, Rong Hu, Wei Yan, Yi-Tong Wang, Kuan W. A. Chee, Yong Wang and Jian-Ping Zhang
Molecules 2017, 22(9), 1398; https://doi.org/10.3390/molecules22091398 - 25 Aug 2017
Viewed by 5358
Abstract
Excited state dynamics of two-dimensional-like conjugated copolymers PFDCN and PFSDCN based on alternating fluorene and triphenylamine main chains and malononitrile pendant acceptor groups with thiophene as π-bridge, have been investigated by using transient absorption spectroscopy. There is an additional conjugated –C=C– bond in [...] Read more.
Excited state dynamics of two-dimensional-like conjugated copolymers PFDCN and PFSDCN based on alternating fluorene and triphenylamine main chains and malononitrile pendant acceptor groups with thiophene as π-bridge, have been investigated by using transient absorption spectroscopy. There is an additional conjugated –C=C– bond in PFDCN, which distinguishes it from PFSDCN. The lowest energy absorption band of each copolymer absorption spectrum is attributed to the π−π* transition with intramolecular charge-transfer, which has a lower fluorescence contribution than those of higher energy absorption bands. The optical excitation of either PFDCN or PFSDCN solution generates polaron pairs that then self-localize and evolve to a bound singlet exciton within a few picoseconds. Due to the additional conjugated –C=C– bond in the acceptor side-chain, PFDCN has a stronger intramolecular charge-transfer characteristic compared with PFSDCN, therefore exhibiting a longer self-localization time (7 ps vs. 3 ps for PFSDCN) and a shorter fluorescence lifetime (1.48 ns vs. 1.60 ns for PFSDCN). Full article
(This article belongs to the Special Issue Photoresponsive Polymers)
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Review

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3619 KiB  
Review
Motion of Adsorbed Nano-Particles on Azobenzene Containing Polymer Films
by Sarah Loebner, Joachim Jelken, Nataraja Sekhar Yadavalli, Elena Sava, Nicolae Hurduc and Svetlana Santer
Molecules 2016, 21(12), 1663; https://doi.org/10.3390/molecules21121663 - 03 Dec 2016
Cited by 10 | Viewed by 6357
Abstract
We demonstrate in situ recorded motion of nano-objects adsorbed on a photosensitive polymer film. The motion is induced by a mass transport of the underlying photoresponsive polymer material occurring during irradiation with interference pattern. The polymer film contains azobenzene molecules that undergo reversible [...] Read more.
We demonstrate in situ recorded motion of nano-objects adsorbed on a photosensitive polymer film. The motion is induced by a mass transport of the underlying photoresponsive polymer material occurring during irradiation with interference pattern. The polymer film contains azobenzene molecules that undergo reversible photoisomerization reaction from trans- to cis-conformation. Through a multi-scale chain of physico-chemical processes, this finally results in the macro-deformations of the film due to the changing elastic properties of polymer. The topographical deformation of the polymer surface is sensitive to a local distribution of the electrical field vector that allows for the generation of dynamic changes in the surface topography during irradiation with different light interference patterns. Polymer film deformation together with the motion of the adsorbed nano-particles are recorded using a homemade set-up combining an optical part for the generation of interference patterns and an atomic force microscope for acquiring the surface deformation. The particles undergo either translational or rotational motion. The direction of particle motion is towards the topography minima and opposite to the mass transport within the polymer film. The ability to relocate particles by photo-induced dynamic topography fluctuation offers a way for a non-contact simultaneous manipulation of a large number of adsorbed particles just in air at ambient conditions. Full article
(This article belongs to the Special Issue Photoresponsive Polymers)
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