Dielectric and IR Spectroscopy of the Macromolecular Reaction of Anhydridization in a Functionalized Side-Chain Liquid Crystalline Copolymer Containing Acrylic Acid Groups

Dielectric and IR Spectroscopy of the Macromolecular Reaction of Anhydridization in a Functionalized Side-Chain Liquid Crystalline Copolymer Containing Acrylic Acid Groups

The anhydrization reaction has been investigated in functionalized side-chain random liquid crystalline (LC) copolymers containing cyanobiphenyl mesogenic and acrylic acid (38 mol %) groups. Heat treatment of the LC copolymer at 130 °C for 5−200 h is accompanied by formation of intra- and intermolec...

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Veröffentlicht in:Macromolecules 2001-05, Vol.34 (11), p.3615-3625
Hauptverfasser: Zhukov, Sergei, Stühn, Bernd, Borisova, Tamara, Barmatov, Evgenii, Barmatova, Marina, Shibaev, Valery, Kremer, Friedrich, Pissis, Polycarpos
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container_end_page 3625
container_issue 11
container_start_page 3615
container_title Macromolecules
container_volume 34
creator Zhukov, Sergei
Stühn, Bernd
Borisova, Tamara
Barmatov, Evgenii
Barmatova, Marina
Shibaev, Valery
Kremer, Friedrich
Pissis, Polycarpos
description The anhydrization reaction has been investigated in functionalized side-chain random liquid crystalline (LC) copolymers containing cyanobiphenyl mesogenic and acrylic acid (38 mol %) groups. Heat treatment of the LC copolymer at 130 °C for 5−200 h is accompanied by formation of intra- and intermolecular anhydrides and network structures causing an increase of the glass transition and clearing temperatures. The influence of annealing on the reorientational dynamics of the copolymers was investigated by broad-band dielectric relaxation spectroscopy. The local dynamics of the side group involving spacer motion (γ relaxation) and mesogen rotation about the long axis (β relaxation) do not depend on the annealing time. At the same time a considerable (more than 2 orders of magnitude) decrease in the relaxation rates of the cooperative δ and α processes was observed due to a gradual increase in the main-chain rigidity during the annealing. The molecular mechanism of all relaxation processes detected is discussed.
doi_str_mv 10.1021/ma0018401
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title Dielectric and IR Spectroscopy of the Macromolecular Reaction of Anhydridization in a Functionalized Side-Chain Liquid Crystalline Copolymer Containing Acrylic Acid Groups
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