Conductive imidazolium side chain liquid crystal polyacrylates prepared from postpolymerization functionalization

Abstract

Hydroxide and tetrafluoroborate salts of imidazolium polyacrylates have been prepared from postpolymerization functionalization of a brominated precursor containing mesogenic side chains followed by anion exchange. The ionic polyacrylates possessed molecular weights in the range 1.1-1.3 3 10 4 gÁmol 21 . Differential scanning calorimetry measurements and polarizing optical microscope observation indicated that the resultant ionic polyacrylates exhibited smectic C and A liquid crystal phases over a temperature range of about 60 C. Electrochemical impedance spectroscopy measurements show that ionic conductivities of the hydroxide salt were much higher than those of the tetrafluoroborate salt for the imidazolium polyacrylates at the same temperature. The maximum ionic conductivity of the random hydroxide salt of imidazolium polyacrylate in the smectic A phase reached 4.45 3 10 22 SÁcm 21 . The ionic polyacrylates were successfully aligned by mechanical shearing in the smectic A phase. Ionic conductivities of the sheared samples were more than 1 order of magnitude higher than those of the random samples in the solid state.

α‐Thiophene end‐capped styrene copolymer containing fullerene pendant moieties: Synthesis, characterization, and gas sensing properties

“…Polymers can be functionalized at both side chain and chain end to improve their properties for different applications. Fullerene (C 60 ) is one of the most popular examples to be functionalized .…”

“…9 There has been significant attention from both academic and industrial communities for CRP techniques due to its versatility in the synthesis of polymers with predictable molecular weights, low dispersities and specific functionalities, and its general applicability for a wide range of monomers. 10 Polymers can be functionalized at both side chain 11 and chain end 12 to improve their properties for different applications. Fullerene (C 60 ) is one of the most popular examples to be functionalized.…”

Self‐assembly and antistatic property of ionic liquid crystalline polymers

“…Therefore, both IPPy‐PF 6 and IPPy‐BF 4 series of polymers show slightly higher T g and T i than those of precursor IPPy‐Br series. Furthermore, this could also be attributed to the introduction of bulky anions (BF 4 − and PF 6 − ) connected to pyridinium cations, and the protons on the pyridine ring may form hydrogen bonds with the fluorine atoms of the BF 4 − and PF 6 − anions 36 …”

“…Furthermore, this could also be attributed to the introduction of bulky anions (BF 4 À and PF 6 À ) connected to pyridinium cations, and the protons on the pyridine ring may form hydrogen bonds with the fluorine atoms of the BF 4 À and PF 6 À anions. 36 The LC phases of the polymers were also investigated by obser- The mesophases of polymers were also characterized by X-ray diffraction analysis in order to provide important information about the structure parameters. The data were shown in Table 2, and some representative X-ray diffraction patterns were presented in Figure 6.…”

Anisotropic films photopolymerized from aligned cross‐linkable gemini ammonium liquid crystals for ion conduction

“…Diammonium liquid crystal monomers were prepared by quaternization of 1,3‐bis(dimethylamino)propane with brominated liquid crystalline precursors. The liquid crystalline precursors m Lc‐Br n were synthesized according to the procedures described previously …”