CHEN Danmei, ZENG Erman, DONG Yanming, HU Xiaolan, ZENG Zhiqun. A POLYMETHYACRYLATE CONTAINING BOWLIC CTV SIDE GROUPS AND IT’S MONOMER[J]. Acta Polymerica Sinica, 2010,(3):352-359.
A CTV (cyclotriveratrylene) derivative with 11-hydroxyl-undecyloxide group as peripheral group (CTV-H) was synthesized by trimerization Then another CTV derivative with single methacrylate group as peripheral group (CTVM) was synthesized and purfied by silica gel column chromatography
purification is the key step of this synthesis. Their chemical structures were verified by 1H-NMR
13C-NMR
element analysis and mass spectroscopy- Both CTV-H and CTV-M are new thermotropic bowlic liquid crystals. They all demonstrated liquid crystalline textures under polarized optical microscope (POM) at room temperature.The DSC determination showed the glass transition temperature
and the clearing point of CTV-H was -20℃ and 49℃
respectively. But a wide endo-thermal DSC peak of -16~78℃ mixed up the contributions of the glass transition temperature
clearing point and curing temperature of CTV-M. Their SAXS and WAXD peaks appeared at 2θ=3.0°
5.0°
6.0°
21.0° and 2θ=2.7°
4.6°
5.5°
20.5°
respectively.The results indicated that their mesophase all belongs to hexagonal columnar phase (Φh). The diameter of the column was 4.4 nm and 4.8 nm,respectively
which agreed with the results of theoretical calculation. CTV-M was used as a monomer to synthesize polymethacrylate containing bowlic CTV side groups (BPM)by means of bulk polymerization.The number average molecular weight of BPM (GPC) was 14900
and the glass transition temperature of polymethacrylate main chain and β relaxation temperature of CTV side groups were measured to be 104℃ and 6℃