Cholesteric mesophase of the hydrogen-bonded blends of liquid crystalline ionogenic copolymers with a low molecular weight chiral dopant

Abstract

A family of a new hydrogen‐bonded complexes based on comb‐shaped LC copolymers containing the monomer units of cyanobiphenyl derivative and n‐alkyloxy‐4‐oxybenzoic acid with a chiral dopant on the base of 4‐pyridinecarboxylic acid and L‐menthol, was prepared. At concentrations of chiral groups 1–25 mol %, the induction of cholesteric phase was observed. Temperature dependences of selective light reflection wavelengths were studied, and helix twisting power was calculated. Depending on the type of copolymer nematic matrix, this value is changed in the range from 12.1 to 19.6 µm−1. It was shown that an increase of a distance between the chiral dopant and the main polymer chain results in a lower values of helix twisting power. With respect to optical properties, the chiral nematic phase in the hydrogen‐bonded complexes is comparable to classical cholesteric copolymers, in which the chiral group is covalently bound to polymer chain. © 1999 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 37: 3215–3225, 1999

Hydrogen-bond induced side-chain liquid crystalline polymers based on nicotinic acid derivatives

“…8. The stretching vibrations of the carbonyl group of the carboxylic acid in P2 appeared at 1684 cm À1 and were attributed to the formation of a dimer [26]. Nicotinic acid derivative C2 exhibited a characteristic band at 1733 cm À1 that was assigned to the stretching vibrations of the carbonyl group adjacent to the ANH group in nicotinic acid.…”

Uji Spektrofotometer Uv-Vis Pada Produk Blending Kristal Cair Kolesteril Akrilat Dengan Kristal Cair Tipe Ester Benzoat

“…Ketika senyawa KCTEB sudah menjadi polimer maka terjadi fenomena dalam polimer, yaitu adanya jarak antara unit kiral dengan rantai utama polimer. Banyaknya unit kiral dalam polimer akan meningkatkan jarak antara unit kiral dengan rantai utama polimer sehingga menyebabkan polimer terstabilkan pada fasa nematik [6]. Polimer yang terstabilkan pada fasa nematik tersebut artinya mengembalikan serapan maksimum produk blending pada panjang gelombang mendekati KA murni seperti yang ditunjukkan pada hasil pengukuran spektrofotometer UV-VIS.…”

Side group functionalized liquid crystalline polymers and blends VII. Phase behaviour and elastic constants K1and K3for hydrogen bonded blends of a functionalized LC copolymer with a low molecular mass non-mesogenic dopant

“…hydrogen bonded blends is the convenience of preparation and the absence of microphase separation [14]. Self-organization and molecular recognition have recently drawn much attention in the eld of liquid Moreover, the physical and technological performance crystalline (LC) polymers [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16].…”

“…Self-organization and molecular recognition have recently drawn much attention in the eld of liquid Moreover, the physical and technological performance crystalline (LC) polymers [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. This is based on of blends advantageousl y combine the properties and new possibilities for controlling the properties of LCs characteristics of both blended components (polymer and designing novel types of supramolecular structures and dopant).…”

“…This is based on of blends advantageousl y combine the properties and new possibilities for controlling the properties of LCs characteristics of both blended components (polymer and designing novel types of supramolecular structures and dopant). as a result of hydrogen bonded [1,11,12,[14][15][16],…”