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Synthesis and mesomorphic properties of side chain liquid crystalline polymers having thiadiazole ring
Author(s) -
Lee Jaehwan,
Hong Sung Il,
Hwang Seung Sang
Publication year - 1997
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1997.021980214
Subject(s) - mesogen , monomer , mesophase , polymer chemistry , acryloyl chloride , polymer , side chain , polymerization , chemistry , ring (chemistry) , liquid crystal , radical polymerization , phase (matter) , materials science , liquid crystalline , organic chemistry , acrylate , optoelectronics
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.