150623-73-7Relevant academic research and scientific papers
Optical properties of chiral nematic side-chain copolymers bearing cholesteryl and azobenzene building blocks
Liu, Jui-Hsiang,Chou, Yen-Ling,Balamurugan, Rathinam,Tien, Kai-Hsin,Chuang, Wen-Tung,Wu, Ming-Zu
, p. 770 - 780 (2011)
Thermotropic chiral nematic (N*) side-chain copolymers (CPs) bearing cholesteryl and azobenzene units were synthesized to investigate the structure-property relationships of the acrylates of the chiral, achiral, and photochromic monomers of free radical polymerization-derived polymers. The polar effect of chlorine substitution on the benzene ring of the chiral monomer (M3*) widened the mesophase transition temperature only at the monomer level, but no remarkable effect on the mesomorphic, optical or thermochromism of the corresponding CPs was observed. An examination of the CPs prepared using differential scanning calorimetry and hot-stage polarizing microscopy showed that all the CPs exhibited a cholesteric nematic phase (N*), and increasing the content of the cholesteryl units in the CPs displayed only the N* phase over a much wider temperature range. On cooling from the isotropic melt of N* CPs, selective reflections of visible light that changed from short to long wavelengths were observed. The photolysis of CPs revealed that CP1-CP4 undergo reversible photoisomerization and that CP5 and CP6 undergo irreversible photoisomerization. The rate of isomerization depends on the type (-N=N-, -CH=CH-, and both) and content of photochromic units in the CPs.
PROCESS FOR THE PRODUCTION OF ACRYLIC ACID ESTERS CONTAINING CARBOXYL GROUPS
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Page/Page column 17-18, (2008/06/13)
A process for the production of acrylic esters of general formula (11) by way of reacting a carboxyl group containing hydroxy compound of general formula (a) with acryloyl chloride (c) according to the following general scheme (C): ( II ) wherein A denotes a flexible spacer group, Y a divalent linking group and M a divalent hydrocarbon ring(s) and/or heterocyclic ring(s) containing group containing up to 30 carbon atoms, characterized in that the reaction is carried out a) in the presence of a solvent medium, whereby the solvent medium contains at least 30% per weight based on the total amount of the solvent medium of a solvent selected from the group of N,N-Dimethyl acetamide (DMAc), N-Methyl-pyrrolidon (NMP), N,N,N'N'-Tetramethyl urea (TMU) and N-Methylcaprolactam, b) in the absence of a base, and that c) the reaction temperature is kept between -10'C and +50'C; said process is especially suitable for obtaining products in high yield and purity in an industrial scale.
CHIRAL DOPANT WITH PHENYLETHANEDIOL FUNCTIONALITY
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Page 16, (2010/11/30)
The invention pertains to a phenylethanediol derivative having at least one polymerizable group, characterized in that the phenylethanediol derivative further comprises at least one photo-convertible group for adjusting the helical twisting power of the phenylethanediol derivative. According to a preferred embodiment the phenylethanediol has the formulawherein A stands for a bond or a p-phenylene group; B and B' are independently (O)p-CoH2o-O-CO-CR'=CH2, o being 2-12, p being 0 or 1, and R' being H or CH3; P stands for a CH2 or a C=O group; Q and Q' are independently selected from H, C1-C3 alkyl, C1-C3 alkoxy, halogen, and CN;n is an integer from 1 to 3; andm is an integer from 0 to 2; and:wherein A stands for a bond or a p-phenylene group; B is (O)p-CoH2o-O-CO-CR'=CH2, o being 2-12, p is 1, and R' being H or CH3; P stands for a CH2 or a C=O group; Q is selected from H, C1-C3 alkyl, C1-C3 alkoxy, halogen, and CN; andm is an integer from 0 to 2.
