Synthesis and properties of mesogen‐jacketed liquid crystalline polymers containing bistolane mesogen

Abstract

On the basis of the concept of mesogen‐jacketed liquid crystalline polymers, a series of new methacrylate monomers, (2,5‐bis[2‐(4′‐alkoxyphenyl) ethynyl] benzyl methacrylate (MACn, n = 4, 6, 8, 10, and 12) and 2,5‐bis[2‐(6′‐decanoxynaphthyl) ethynyl] benzyl methacrylate (MANC10), and their polymers, PMACn (n = 4, 6, 8, 10, and 12) and PMANC10 were synthesized. The bistolane mesogen with large π‐electron conjugation were side‐attached to the polymer backbone via short linkages. Various characterization techniques such as differential scanning calorimetry, wide‐angle X‐ray diffraction, and polarized light microscopy were used to study their mesomorphic phase behavior. The polymer PMACn with shorter flexible substituents (n = 4) forms the columnar nematic (ϕN) phase, but other polymers with longer flexible tails (n = 6, 8, 10, and 12) can develop into a smetic A (SA) phase instead of a ϕN phase. The PMANC10 containing naphthyl can also form a well‐defined SA phase. © 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2010

2,5-Bis[2-(4-methylphenyl)ethynyl]benzyl methacrylate

“…The bistolane derivatives is very important kind of high birefringence material. We have reported the similar synthesis of the compound in previous paper (Zhang et al 2010). Herein we present the crystal structure of the title compound (see Fig.…”

“…The title compound was prepared according to the literature (Zhang et al, 2010). Single crystals suitable for X-ray diffraction were prepared by slow evaporation of a dichloromethane solution at room temperature.…”

New liquid crystals derived from thiophene connected to the 1,2,4-oxadiazole heterocycle

“…Compound 9 was previously synthesised according to the literature [28] and then reacted with the intermediate 2 through Sonogashira coupling, affording compound 10. The nitrile 10 was obtained through a nucleophilic substitution using copper cyanide, the nitrile group being converted to the oxime group 12.…”

Synthesis and phase behavior of a polynorbornene‐based molecular brush with dual “jacketing” effects

“…MJLCPs based on polyacrylate/polymethacrylate, polystyrene, polyacetylene, polysiloxane, or polynorbornene have been synthesized and studied. And the rigid core of the side groups have been varied to contain terephthalate, biphenyl, bistolane, thiophene, oxadiazole, and so on. From the synthetic viewpoint, MJLCPs can be obtained by controlled/living polymerization methods such as living radical polymerizations, and the molecular weights (MWs) and MW distributions can be controlled.…”