Synthesis and phase behavior of a new 2-vinylbiphenyl-based mesogen-jacketed liquid crystalline polymer with a high glass transition temperature and low threshold molecular weight

Abstract

A new mesogen-jacketed liquid crystalline (LC) polymer was synthesized by NMP. It has a high Tg and a relatively low threshold MW for LC formation.

Influence of main chain on the phase behaviors of side‐chain liquid‐crystalline polymers with triphenylene mesogens of long alkyl tail substituents

“…Mesogen‐jacketed liquid‐crystalline polymers (MJLCPs), in which mesogenic units are laterally attached to the main chain through only one covalent C–C bond or a very short spacer, have gained tremendous interest. This is due to their novel structures and properties, such as high glass transition temperatures, broad temperature ranges of mesophase, formation of banded structures texture after mechanical shearing in LC state and an ideal rod‐forming system . However, the synthesis of MJLCPs is very difficult.…”

Effects of rigid cores and flexible tails on the phase behaviors of polynorbornene-based mesogen-jacketed liquid crystalline polymers

“…3 For MJLCPs, the whole polymer chains serve as supramolecular mesogens to construct ordered LC structures. Many MJLCPs have been reported, with monomers derived from 2-vinylhydroquinone, 19,20,22,23 2-vinylterephthalic acid (VTA), [24][25][26] vinylbiphenyl, [27][28][29] vinylterphenyl, 30,31 and so on. Many LC phases have been observed, including hexagonal columnar (Col h ), 26,29 columnar nematic (Col n ), 30,32 hexatic columnar nematic (Col hn ), 32,33 smectic A (SmA), 27,34 smectic C, 28,35 and so forth.…”

Columnar Phase-Forming Polymers

“…For instance, monomer M3 (Chart 5) does not form a mesophase. However, the corresponding polymer P3 features a high T g (173 to 208 C, depending on the MW) and a Col h phase when the MW exceeds 0.53 Â 10 4 (DP = 22) (Zhang et al 2014). The LC phase retains after cooling to room temperature.…”