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2.361 Aktuelle Fachpublikationen zum Thema temperature

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Graphene nanoplate and multiwall carbon nanotube–embedded polycarbonate hybrid composites: High electromagnetic interference shielding with low percolation threshold

20.03.2015 | Sandip Maiti, B.B. Khatua, Polymer Composites, 2015

This study has reported the preparation of polycarbonate (PC)/graphene nanoplate (GNP)/multiwall carbon nanotube (MWCNT) hybrid composite by simple melt mixing method of PC with GNP and MWCNT at 330°C above the processing temperature of the PC (processing temperature is 280°C) followed by ...

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Unique Curing Properties through Living Polymerization in Crosslinking Materials: Polyurethane Photopolymers from Vinyl Ether Building Blocks

17.03.2015 | Stefan Kirschbaum, Katharina Landfester, Andreas Taden, Angewandte Chemie International Edition, 2015

Abstract Photopolymers with unique curing capabilities were produced by combining living cationic polymerization with network formation and restricted polymer motion. A vinyl ether diol was synthesized as a functional building block and reacted with isophorone diisocyanate to form a highly ...

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Enhanced O2 Selectivity versus N2 by Partial Metal Substitution in Cu-BTC

13.03.2015 | Dorina F. Sava Gallis; Marie V. Parkes; Jeffery A. Greathouse; Xiaoyi Zhang; Tina M. Nenoff, Chemistry of Materials, 2015

Here, we describe the homogeneous substitution of Mn, Fe, and Co at various levels into a prototypical metal–organic framework (MOF), namely Cu-BTC (HKUST-1), and the effect of that substitution on preferential gas sorption. Using a combination of density functional theory (DFT) calculations, ...

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Dehydration Kinetics and Changes of Bioactive Compounds of Tulip and Poppy Petals as a Natural Colorant under Vacuum and Oven Conditions

12.03.2015 | Salih Karasu, Mahmut Kilicli, Mehmet Baslar, Muhammet Arici, Osman Sagdic, Mustafa Karaagacli, Journal of Food Processing and Preservation, 2015

Abstract The aim of this study was to investigate the drying kinetics and thermal degradation of anthocyanin and other phenolic compounds of tulip and poppy petals, as potential source of natural colorant, under both oven and vacuum drying processes at 45, 55 and 65C. The novelty of the study ...

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Deep‐colour vat dyeing of cotton knit fabric on a modified jet dyeing machine

12.03.2015 | Hiroshi Wakoh, Mina Furuie, Daisuke Inaba, Nobuto Azuma, Koji Nakane, Nobuo Ogata, Toru Shimizu, Osamu Ishimaru, Coloration Technology, 2015

To improve the vat dyeing of cotton knit fabric with Indanthren Black RB Coll. (CI Vat Black 9), the basic parameters of dyeing, including the concentrations of chemicals, the dyeing temperature and duration, and the apparent diffusion coefficient of the dye, were obtained by test dyeing with a ...

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A Thermo‐Alkaline Lipase from a New Thermophile Geobacillus thermodenitrificans AV‐5 with Potential Application in Biodiesel Production

11.03.2015 | Lew P. Christopher, Vasudeo P. Zambare, Archana Zambare, Hemanathan Kumar, Ladislav Malek, Journal of Chemical Technology & Biotechnology, 2015

Abstract BACKGROUND A thermophilic lipase‐producing Geobacillus thermodenitrificans strain AV‐5 was isolated from the Mushroom Spring of Yellowstone National Park in WY, USA and studied as a source of lipase for transesterification of vegetable oils to biodiesel. RESULTS A maximum ...

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Intermolecular Asymmetric Carboesterification of Alkenes by Using Chiral Amine Auxiliaries under O2: Synthesis of Enantioenriched α‐Methylene‐γ‐Lactones through Chloropalladation of Alkynes

11.03.2015 | Zhenming Zhang, Wanqing Wu, Jianhua Liao, Jianxiao Li, Huanfeng Jiang, Chemistry - A European Journal, 2015

Abstract Herein, the first example of chloropalladation‐initiated asymmetric intermolecular carboesterification of alkenes with alkynes by using chiral amine auxiliaries is reported. The use of (1S,2S)‐N1,N1‐dimethylcyclohexane‐1,2‐diamine auxiliaries is essential for providing ...

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Gas‐phase equilibrium constants for the thermally initiated oxidation of hexafluoropropene with molecular oxygen

11.03.2015 | David Lokhat, Deresh Ramjugernath, Maciej Starzak, Journal of Physical Organic Chemistry, 2015

Equilibrium constants for a kinetic model of the thermally initiated gas‐phase oxidation of hexafluoropropene have been calculated in the temperature range of 463–493 K based on the thermochemical properties of the reactive species. Standard molar enthalpies and entropies of formation as well as ...

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Influence of oxygen partial pressure on SrTiO3 bulk crystal growth from non-stoichiometric melts

11.03.2015 | Christo Guguschev; Dirk J. Kok; Zbigniew Galazka; Detlef Klimm; Reinhard Uecker; Rainer Bertram; Martin Naumann; Uta ..., CrystEngComm, 2015

Cylindrical SrTiO3 single crystals with diameters and lengths exceeding one inch were grown from non-stoichiometric melts below 1800 °C using the high temperature top-seeded solution growth (TSSG) method. Despite the large crystal diameter the quality has been improved compared to Verneuil grown ...

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Structural, Magnetic, and Redox Diversity of First-Row Transition Metal Complexes of a Pyridine-Based Macrocycle: Well-Marked Trends Supported by Theoretical DFT Calculations

11.03.2015 | Bohuslav Drahoš; Radovan Herchel; Zdeněk Trávníček, Inorganic Chemistry, 2015

A series of first-row transition metal complexes with 15-membered pyridine-based macrocycle (3,12,18-triaza-6,9-dioxabicyclo[12.3.1]octadeca-1(18),14,16-triene = L) was prepared ([MII(L)Cl2], where M = Mn, Co, Ni, Zn (1, 3, 4, 6); [FeIII(L)Cl2]Cl (2), [CuII(L)Cl]Cl (5)) and thoroughly ...

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