Polymerisable mixtures
A technology of mixtures and polymers, applied in thin material processing, chemical instruments and methods, liquid crystal materials, etc., can solve the problem that liquid crystal gels do not have thermal and mechanical stability, and are not suitable for optically anisotropic polymer films, etc. question
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Embodiment 1
[0119] Within the scope of the investigation in Example 1, time-dependent measurements were carried out in which the decrease in optical anisotropy during the polymerization process could be directly monitored.
[0120] a) 1.45 g (30%) of the compound hydroquinone-bis(4-acryloylbutoxy)benzoate (M.1), 0.97 g (20%) of the compound 4-acryloylbenzoic acid 4'-biphenyl ester (M.2.1), 2.37 g (49%) of the compound 4'-biphenyl ester of 4-allyloxybenzoate (M.3.1), 50 mg (1%) of Photoinitiator 2-methyl-1-[4-(methylthio)phenyl]-2-morpholinopropan-1-one (commercially available, trade name Irgacure 907, Ciba Specialty Chemicals, Lapa Zheim) and 10 mg (0.2%) of the stabilizer 2,6-di-tert-butyl-4-methylphenol (BHT) were stirred in the melt at 120° C. to a homogeneous mixture (mixture 1a). The two glass plates were coated with polyvinyl alcohol orientation layer respectively, and wiped in a single direction with a flannelette. At 120 DEG C., 5 mg of the nematic liquid crystal mixture 1a was ...
Embodiment 2
[0132] 2.1 g (42%) of hydroquinone-bis(4-acryloylbutoxy)benzoate (M.1), 1.4 g (28%) of 4-acryloylbenzoic acid 4'-linked Phenyl ester (M.2.1), 1.5 g (30%) of 4'-cyanobiphenyl-ester of 4-butoxybenzoate (M.3.3), 50 mg of photoinitiator Irgacure(R) 819 (Ciba Specialty Chemicals, Lappazheim) and 10 mg of the stabilizer BHT in the form of a melt were stirred at 120° C. until a homogeneous mixture (mixture 2). As in Example 1a), 5 mg of this nematic liquid crystal mixture was applied between two glass plates which had been coated with an alignment layer and distributed until a film about 10 microns thick remained. The film was heated at 120° C. for several minutes until it was completely clear and then crosslinked with UV-A light (approximately 100 mW / cm 2 ). After removing one of the glasses, the optical anisotropy Δn was directly measured at 633 nm using a prism coupler (MetriconModel 2010). The result was Δn=0.196, 32% more than that of the crosslinked liquid crystal polymerizat...
Embodiment 3
[0134] 1.5 g (30%) of hydroquinone-bis(4-acryloylbutoxy)benzoate (M.1), 1.75 g (35%) of 4-(4'-acryloylbutoxy base) 4"-biphenyl benzoate (M.2.2), 1.75 g (35%) of 4'-biphenyl 4-allyloxybenzoate (M.3.1), 50 mg photoinitiated Agent Irgacure 907 and 10 milligrams of stabilizer BHT are stirred at 120 ℃ in the form of a melt until becoming a homogeneous mixture (mixture 3). As in Example 1a), 5 milligrams of this nematic liquid crystal mixture are coated on two pieces of between glass plates coated with an alignment layer and spread until a film about 10 microns thick is left. The film is heated at 90° C. for several minutes until it is completely clear. The optical retardation at 633 nm is according to the above-mentioned Sénarmont Measured by the method. The measured uncrosslinked film is 2190 nanometers, which is consistent with the optical anisotropy Δn=0.201 when the thickness of the film measured in the UV-VIS spectroscopic needle is 10.9 microns subsequently. The UV-A light ir...
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