- Method for preparing glue and medical glue
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The present invention provides a method for preparing an acrylate based adhesive in high purity, which performs a process of producing an alkyl cyanoacrylate polymer from alkyl cyanoacetate and a process of depolymerizing the alkyl cyanoacrylate polymer into monomers together to reduce the production costs.(AA) Mix alkyl alcohol with an organic solvent(BB) Add cyanoacetic acid and strong acid to the mixed solution and heating the same for esterification(CC) Remove water produced during the esterification reaction by azeotropic distillation and purify/dry the mixture(DD) Stir alkyl cyanoacetate, a crosslinking agent, and a catalyst to prepare a polymer(EE) Prepare a crude polymer from the polymer(FF) Perform catalytic depolymerization of the crude polymer to obtain a monomer-type high purity polymerCOPYRIGHT KIPO 2018
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Paragraph 0082-0085
(2018/06/26)
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- A molecular breakwater-like tetrapod for organic solar cells
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We report the synthesis and characterization of a tetrapodal breakwater-like small molecule, SO, containing a tetraphenylsilane core and four cyanoester functionalized terthiophene arms. SO possesses a deep lying HOMO energy level of -5.2 eV and a narrow bandgap of 1.9 eV. Absorption, X-ray scattering and differential scanning calorimetry (DSC) measurements indicate crystalline nature of this compound but very slow crystallization kinetics. Solar cells employing SO and phenyl-C61-butyric acid methyl ester (PCBM) were fabricated and evaluated. Relatively low performance was obtained mainly due to the lack of optimal phase separation under various processing conditions including thermal annealing, slow-cooling and solvent annealing. Addition of poly(thienylene vinylene) (PTV), poly(3-hexylthiophene) (P3HT) and a platinum-containing low bandgap conjugated polymer Pt-BODIPY, into the SO/PCBM blend was found to induce device favorable phase separation and the polymers were found to act as the primary hole conductor. Such ternary blend devices showed cooperatively improved performances over binary devices employing either SO or the individual conjugated polymer alone.
- Yang, Jianzhong,He, Wenhan,Denman, Kimberly,Jiang, Ying-Bing,Qin, Yang
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p. 2108 - 2119
(2015/02/05)
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- ALPHA-CYANOACRYLATE ESTER SYNTHESIS
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The high temperatures required for cracking the cyanoacrylate oligomers, produced by the Knovenagel condensation of formaldehyde and a cyanoacetate, limit the synthetic diversity and the number of different side chains that can be incorporated into a cyanoacrylate prepared using this method. Accordingly, the diversity of cyanoacrylate monomers prepared industrially is quite limited. Disclosed herein is a method for the preparation of alpha-Cyanoacrylate ester monomers from a variety of phosphonium and ammonium alpha-cyanoacrylate salts. The phosphonium and ammonium alpha-cyanoacrylate salts are of the general formula: (I).
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Page/Page column 10-12
(2012/04/17)
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- Highly efficient solvent-free condensation of carboxylic acids with alcohols catalysed by zinc perchlorate hexahydrate, Zn(ClO4) 2·6 H2O
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Zinc perchlorate hexahydrate, Zn(ClO4)2· 6 H2O, efficiently catalyses the esterification between nearly equimolar amounts of carboxylic acids and alcohols. The reaction works under solvent-free conditions at relatively low temperatures. Excellent results were obtained with a wide range of substrates.
- Bartoli,Boeglin,Bosco,Locatelli,Massaccesi,Melchiorre,Sambri
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- Structure-activity relationship of new organic NLO materials based on push-pull azodyes. 1: Synthesis and molecular properties of the dyes
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Several new push-pull azobenzene dyes were synthesized by diazonium salt coupling of electron-poor anilines with N,N-dialkylanilines. Their dipole moments and first-order hyperpolarizabilities were evaluated respectively from the concentration dependence of the dielectric constant of solutions in apolar solvents and by the electric-field-induced-second-harmonic-generation (EFISH) technique. Investigation of the influence of both nature and steric hindrance of the electron-withdrawing group allowed to highlight a significant deviation from linearity in the relationship between dipole moments and first-order hyperpolarizabilities. This effect was particularly noticeable when multiple electron withdrawing groups pointing in different directions were present on the same phenyl ring. Johann Ambrosius Barth 1998.
- Tirelli,Altomare,Solaro,Ciardelli,Meier,Bosshard,Guenter
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p. 122 - 128
(2007/10/03)
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- BIOCHEMICAL PREPARATIONS OF BOTH THE ENANTIOMERS OF METHYL 3-HYDROXYPENTANOATE AND THEIR CONVERSION TO THE ENANTIOMERS OF 4-HEXANOLIDE, THE PHEROMONE OF TROGODERMA GLABRUM
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Both the enantiomers of methyl 3-hydroxypentanoate were prepared by microbial asymmetric reduction of 3-oxopentanoic esters.Conversion of methyl 3-hydroxypentanoate to 4-hexanolide, the pheromone of Trogoderma glabrum, was achieved.
- Mori, Kenji,Mori, Hideto,Sugai, Takeshi
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p. 919 - 926
(2007/10/02)
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