New Photoresponsive Poly(meth)acrylates Bearing Azobenzene Moieties Obtained via ATRP Polymerization Exhibiting Liquid-Crystalline Behavior
Open Access
Abstract
Here, we report our studies on photoresponsive poly(meth)acrylates containing azobenzene groups connected to a polymer backbone via a short methylene linker. A series of side-chain azobenzene polymers was synthesized via the atom transfer radical polymerization (ATRP) technique using several catalytic systems. The polymers synthesized under the optimized conditions were characterized by a narrow polydispersity (Đ ≤ 1.35), and they underwent a reversible transformation of their structure under light illumination. The fabricated polymers can store and release energy accumulated during the UV-light illumination by the thermal cis-trans isomerization of the chromophore groups. The enthalpy of the process (determined from DSC) was relatively high and equaled 61.9 J∙g−1 (17 Wh∙kg−1), indicating a high potential of these materials in energy storage applications. The liquid-crystalline behavior of the synthesized poly(meth)acrylates was demonstrated by the birefringent optical textures as observed in thin-films and X-ray scattering studies.Keywords
This publication has 29 references indexed in Scilit:
- Control over molecular motion using thecis–transphotoisomerization of the azo groupBeilstein Journal of Organic Chemistry, 2012
- Synthesis and phase behaviour of a homologous series of polymethacrylate-based side-chain liquid crystal polymersEuropean Polymer Journal, 2012
- Large-Area Three-Dimensional Molecular Ordering of a Polymer Brush by One-Step ProcessingScience, 2010
- Universal Solvation Model Based on Solute Electron Density and on a Continuum Model of the Solvent Defined by the Bulk Dielectric Constant and Atomic Surface TensionsThe Journal of Physical Chemistry B, 2009
- Photomobile Polymer Materials: Towards Light‐Driven Plastic MotorsAngewandte Chemie, 2008
- Synthesis and Third-order NLO Properties of polymethacrylates containing Pendent Azobenzene GroupsHigh Performance Polymers, 2007
- Novel photo-switching using azobenzene functional materialsJournal of Photochemistry and Photobiology A: Chemistry, 2006
- Transition states for deactivation reactions in the modeled 2,2,6,6‐tetramethyl‐1‐piperidinyloxy‐mediated free‐radical polymerization of acrylonitrileJournal of Polymer Science Part A: Polymer Chemistry, 2005
- Transition structures and reaction barriers in the styrene–acrylonitrile copolymerization system according to quantum mechanical calculationsJournal of Polymer Science Part A: Polymer Chemistry, 2005
- Penultimate unit effects in the free‐radical copolymerization of styrene with acrylonitrile according to theoretical thermochemistryJournal of Polymer Science Part A: Polymer Chemistry, 2002