Synthesis and mesomorphic properties of side chain liquid crystalline polymers having thiadiazole ring

New liquid crystalline monomers having 1,3,4‐thiadiazole ring as mesogen were synthesized by using Lawesson's reagents to prepare the thiadiazole ring and acryloyl chloride and methacryloyl chloride to introduce the vinyl group. These monomers were polymerized in the presence of 2,2′‐azoisobuty...

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Veröffentlicht in:Macromolecular chemistry and physics 1997-02, Vol.198 (2), p.391-400
Hauptverfasser: Lee, Jaehwan, Hong, Sung Il, Hwang, Seung Sang
Format: Artikel
Sprache:eng
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Zusammenfassung:New liquid crystalline monomers having 1,3,4‐thiadiazole ring as mesogen were synthesized by using Lawesson's reagents to prepare the thiadiazole ring and acryloyl chloride and methacryloyl chloride to introduce the vinyl group. These monomers were polymerized in the presence of 2,2′‐azoisobutyronitrile as initiator in THF. All monomers and polymers show cholesteric behavior and a broad chiral smectic C* phase. As the spacer length increases, the phase transition temperature is lowered and the polymers show higher phase transition temperatures and improved mesophase stabilities compared to the corresponding monomers.
ISSN:1022-1352
1521-3935
DOI:10.1002/macp.1997.021980214