Photoresponsive Azopolyester–PMMA Block Copolymers Obtained by Combination of ATRP, Polycondensation, and “Click” Chemistry

Authors

  • Cristina Berges,

    1. Instituto de Ciencia de Materiales de Aragón (ICMA), CSIC-Universidad de Zaragoza, Departamento de Física de la Materia Condensada, C/Pedro Cerbuna 12, 50009 Zaragoza, Spain
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  • Irakli Javakhishvili,

    1. Technical University of Denmark, Department of Chemical and Biochemical Engineering, Danish Polymer Center, Building 227, DK-2800 Kgs. Lyngby, Denmark
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  • Søren Hvilsted,

    1. Technical University of Denmark, Department of Chemical and Biochemical Engineering, Danish Polymer Center, Building 227, DK-2800 Kgs. Lyngby, Denmark
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  • Carlos Sánchez,

    1. Instituto de Ciencia de Materiales de Aragón (ICMA), CSIC-Universidad de Zaragoza, Departamento de Física de la Materia Condensada, C/Pedro Cerbuna 12, 50009 Zaragoza, Spain
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  • Rafael Alcalá

    Corresponding author
    1. Instituto de Ciencia de Materiales de Aragón (ICMA), CSIC-Universidad de Zaragoza, Departamento de Física de la Materia Condensada, C/Pedro Cerbuna 12, 50009 Zaragoza, Spain
    • Instituto de Ciencia de Materiales de Aragón (ICMA), CSIC-Universidad de Zaragoza, Departamento de Física de la Materia Condensada, C/Pedro Cerbuna 12, 50009 Zaragoza, Spain.
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Abstract

Novel azobenzene-containing block copolymers (BCs) with a polyester block bearing azobenzene moieties in the side chain and a poly (methyl methacrylate) (PMMA) block have been synthesized by the combination of atom transfer radical polymerization (ATRP), polycondensation, and “click” chemistry. Two azide-terminated polyesters with different molecular weight (obtained by polycondensation) were coupled to an alkyne-functionalized PMMA (obtained by ATRP). Blends of the BC with the highest azo content (wt%) and an azopolyester homopolymer were also prepared. All these compounds were investigated by polarized light optical microscopy (POM), differential scanning calorimetry (DSC), and transmission electron microscopy (TEM). Polarized light-induced anisotropy was studied by birefringence and dichroism measurements.

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