57198-94-4Relevant academic research and scientific papers
Polymerizable liquid crystal compound, and optical antisotropic compsn.
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Paragraph 0070, (2016/10/10)
The present description relates to a polymerizable liquid crystal compound, a polymerizable liquid crystal composition including the same, and an optically anisotropic body. The polymerizable liquid crystal compound includes a radical derived from the first liquid crystal molecule including a mesogen group having a non-aromatic ring; a radical derived from the second liquid crystal molecule including a mesogen group that has a structure different from said mesogen group having a non-aromatic ring and includes a ring containing a double bond; and a linker that has a specific structure and links the sp3-hybridized carbon in the non-aromatic ring of the radical derived from the first liquid crystal molecule and the sp2-hybridized carbon in the mesogen group of the radical derived from the second liquid crystal molecule, wherein at least one of the radicals derived from the first and the second liquid crystal molecules may include one or more polymerizable groups which are connected to the mesogen group directly or via spacer groups. Such polymerizable liquid crystal compound makes it possible to exhibit stable reverse wavelength dispersion solely or by being mixed with other liquid crystal materials.
Hydroxy functional acrylate and methacrylate monomers prepared via lipase-catalyzed transacylation reactions
Popescu, Dragos,Hoogenboom, Richard,Keul, Helmut,Moeller, Martin
experimental part, p. 80 - 89 (2010/08/20)
Candida antarctica lipase B (CAL-B, Novozyme 435) catalyzes the transacylation of methyl acrylate and methyl methacrylate with diols and triols in 2-methyl-2-butanol at 50 °C. Under the experimental conditions, up to 70 mol% of the acyl donor methyl acrylate was converted. Methyl methacrylate is the less efficient acyl donor (up to 60 mol%) due to the higher sterical hindrance in the enzymatic transacylation. Under the reaction conditions high yields of the mono-acylated products are obtained, which contain minor amounts of bis(meth)acrylates. In addition it was observed that Novozyme 435 catalyzes regioselectively the acylation of the primary hydroxyl groups. In comparison with the chemical catalyzed route no selectivity was observed for unsubstituted diols. For substituted diols more mono-acylated product was formed in the lipase-catalyzed reaction than in the chemical catalyzed reaction.
Acrylic-based adhesive composition
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, (2008/06/13)
An Adhesive composition for us in surgery, especially ophthalmic surgery, comprises a mixture of a cyanoacrylate of general formula (I) and an acrylate compound of formula (II) where R4 is an alkylene group and Y is a cycloalkyl group or Y═OR where R═H or acryloyl. It is found that compositions of this type have a number of advantages over simple cyanoacrylate adhesives, including: (a) a longer cure time, allowing easier handling of the joint; (b) a more flexible cured product; (c) a tendency for the cured to come away from the tissue after a month or so thus facilitating healing; and (d) a substantially non-exothermic curing reaction, thereby avoiding thermal damage to the tissue.
FIBROUS POLYMERIC COMPOSITES IMMOBILIZING GLUCOSE OXIDASE
Kumakura, M.,Kojima, T.,Kaetsu, I.
, p. 65 - 72 (2007/10/02)
Fibrous polymeric composites immobilizing glucose oxidase have been prepared by the radiation polymerization of various glass-forming monomers at low temperatures.The radiation polymerization of the monomer solution containing the enzymes and fibrous material was studied as a function of the irradiation temperature, at which the polymerization rate and enzyme activity had optimum values.The nature of the monomer, monomer concentration and the thickness of the polymer matrix on the fibrous material was shown to affect the enzyme activity of the composites.
