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43.257 Aktuelle Fachpublikationen zum Thema temperature

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Reaction Kinetics of Carbon Dioxide (CO2) Absorption in Sodium Salts of Taurine and Proline Using a Stopped‐Flow Technique

18.10.2014 | Ahmed Sodiq, Aravind V. Rayer, Akinola A. Olanrewaju, Mohammad R. M. Abu Zahra, International Journal of Chemical Kinetics, 2014

ABSTRACT The pseudo–first‐order reaction rate constants (k0, s−1) for the reaction of carbon dioxide in aqueous solutions of sodium taurate (NaTau) and sodium prolinate (NaPr) were measured using a stopped‐flow technique at a temperature range of 298–313 K. The solutions concentration varied ...

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Mechanical and thermal properties of potassium salts of poly(ethylene‐co‐ethylacrylate): Polyolefin ionomers in the absence of acid groups

18.10.2014 | Masataka Aoyama, Tomonori Koda, Ken Miyata, Taichi Nishio, Akihiro Nishioka, Polymer Engineering and Science, 2014

The thermal and mechanical properties of ionomers prepared by partial saponification of poly(ethylene‐co‐ethylacrylate) (EEA) with potassium were investigated by using differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA). The Vicat softening temperature (VST) and bending ...

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Preparation, swelling properties, and displacement performance of functional amphiphilic microspheres

18.10.2014 | Peng Zhang, Yuanjun Dong, Wenzhang Huang, Zhenfu Jia, Chengyu Zhou, Maolei Guo, Haiyang Yu, Journal of Applied Polymer Science, 2014

ABSTRACT Because polymers containing benzyl chloromethyl groups are easily modified for functional production, the dispersion polymerization of acrylamide, 4‐vinylbenzyl chloride, and N,N‐methylene bisacrylamide in dimethylformamide initiated with α,α‐azobisisobutyronitrile was carried out to ...

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Fabrication and characterization of novel hyperbranched polyimides with excellent organosolubility, thermal and mechanical properties

18.10.2014 | Wenqiu Chen, Quantao Li, Quanyuan Zhang, Zushun Xu, Xianbao Wang, Changfeng Yi, Journal of Applied Polymer Science, 2014

ABSTRACT A series of amine‐terminated and anhydride‐terminated hyperbranched polyimides (HBPIs) were successfully prepared with various commercial dianhydrides and a novel BB′2‐type aromatic triamine, 2,4,6‐tris[4‐(4‐aminophenoxy)phenyl]pyridine, with a symmetrical triaryl‐substituted ...

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Preparation and evaluation of nonphosphate terpolymer as scale inhibitor and dispersant for Ca3(PO4)2, BaSO4, and Iron (III) hydroxide scales

18.10.2014 | Yunyun Bu, Yuming Zhou, Qingzhao Yao, Yiyi Chen, Wei Sun, Wendao Wu, Journal of Applied Polymer Science, 2014

ABSTRACT The polymeric scale inhibition and dispersion agents (PAYS) were prepared by graft copolymerization of acrylic acid, allylpolyethoxy carboxylate (APEY) and 2‐acrylamido‐2‐methyl‐propanesulfonic acid by using ammonium persulfate as a radical initiator in aqueous solution, among which ...

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Conductive imidazolium side chain liquid crystal polyacrylates prepared from postpolymerization functionalization

18.10.2014 | Caihong Wang, Yong Wu, Shuai Tan, Ting Liang, Xiaohui Yang, Journal of Applied Polymer Science, 2014

ABSTRACT Hydroxide and tetrafluoroborate salts of imidazolium polyacrylates have been prepared from postpolymerization functionalization of a brominated precursor containing mesogenic side chains followed by anion exchange. The ionic polyacrylates possessed molecular weights in the range ...

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Impact of oxygen transport properties on polypropylene thermal oxidation, part 1: Effect of oxygen solubility

18.10.2014 | Alexandre François‐Heude, Emmanuel Richaud, Alain Guinault, Eric Desnoux, Xavier Colin, Journal of Applied Polymer Science, 2014

ABSTRACT A general kinetic model is proposed to describe the polypropylene thermal oxidation of thin polypropylene films in a wide range of temperatures (from 60 to 200°C) and oxygen partial pressures (from 0.02 to 5 MPa) using a single set of parameters. This model was calibrated with several ...

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Transition metal oxide catalysts as an alternative for the oxidation of nitrogen monoxide to nitrogen dioxide: kinetic modelling at high space velocity

18.10.2014 | Leonardo Tecchio, Pablo Marín, Fernando V. Díez, Salvador Ordóñez, Journal of Chemical Technology & Biotechnology, 2014

Abstract Background The oxidation of NO to NO2 is a key step in environmental pollution abatement techniques, such as the “fast‐SCR” or the diesel engines catalytic traps. In both cases, the conversion of an important fraction of NO into NO2 is a key step. In this work, two commercially ...

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Estimate of the cation distribution for Ti‐doped Ni0.68Fe2.32O4 spinel ferrites by fitting magnetic moments at 10 K

18.10.2014 | J. Xu, D. H. Ji, Z. Z. Li, W. H. Qi, G. D. Tang, X. Y. Zhang, Z. F. Shang, L. L. Lang, physica status solidi (b), 2014

Ti‐doped Ni0.68Fe2.32O4 spinel ferrite samples with nominal composition Ni0.68−0.8xTixFe2.32−0.2xO4 (0 ≤ x ≤ 0.312) were prepared using conventional ceramic methods. The samples exhibited a single‐phase cubic spinel structure. When the doping level had values x > 0.15, a transition temperature, ...

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From orientation disordered to ordered—An ab initio simulation on ammonia borane phase transition within Van Der Waals corrections

18.10.2014 | Qi Song, Zhenyi Jiang, Zhiyong Zhang, Yuqing Hou, Xiaodong Zhang, Journal of Computational Chemistry, 2014

In this work, we report a detailed theoretical investigation of the phase transition of ammonia borane (NH3BH3; AB), from a tetragonal I4mm ( ) phase with disordered orientation of hydrogen to an orthorhombic phase with Pmn21 ( ) symmetry, as a function of temperature based on Density Functional ...

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