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Preparation of dual‐layer acetylated methyl cellulose hollow fiber membranes via co‐extrusion using thermally induced phase separation and non‐solvent induced phase separation methods

25-Jul-2015 | Hanna Jang, Du‐Hyun Song, Hye‐Jin Lee, Seong‐Han Lim, In‐Chul Kim, Young‐Nam Kwon, Journal of Applied Polymer Science, 2015

ABSTRACT Dual‐layer acetylated methyl cellulose (AMC) hollow fiber membranes were prepared by coupling the thermally induced phase separation (TIPS) and non‐solvent induced phase separation (NIPS) methods through a co‐extrusion process. The TIPS layer was optimized by investigating the effects ...

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Transfer Properties of Glycylglycine from Water to Aqueous NaNO3, NaClO4, and Na2SO4 Solutions

24-Jul-2015 | Chunli Liu; Li Zhou; Liqun Fan; Chonggui Ren, Journal of Chemical & Engineering Data, 2015

Enthalpies of solution and densities of glycylglycine in aqueous solutions of NaNO3, NaClO4, and Na2SO4 were measured at 298.15 K. Standard transfer enthalpies (ΔtrH0), standard transfer partial molar volume (ΔtrVϕ0), and hydration numbers (Nh) have been determined for glycylglycine. All of the ...

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Multiple Stimuli-Responsive and White-Light Emission of One-Pot Synthesized Block Copolymers Containing Poly(3-hexylthiophene) and Poly(triethyl glycol allene) Segments

24-Jul-2015 | Yan-Yu Hu; Ming Su; Cui-Hong Ma; Zhipeng Yu; Na Liu; Jun Yin; Yunsheng Ding; Zong-Quan Wu, Macromolecules, 2015

Conjugated block copolymers with tunable properties have attract considerable research interests in recent years. Herein, we report a series of novel block copolymers containing conjugated poly(3-hexylthiophene) (P3HT) and poly(triethyl glycol allene) (PTA) segments which were synthesized in one ...

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The Role of Concentration Dependent Static Permittivity of Electrolyte Solutions in the Debye–Hückel Theory

23-Jul-2015 | Ignat Yu. Shilov; Andrey K. Lyashchenko, Journal of Physical Chemistry B, 2015

The Debye–Hückel theory has been extended to allow for arbitrary concentration dependence of the electrolyte solution static permittivity. The theory follows the lines advanced by Erich Hückel (Hückel, E. Phys. Z. 1925, 26, 93) but gives rise to more general and lucid results. New theoretical ...

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Surface Activity and Aggregation Behavior of Siloxane-Based Ionic Liquids in Aqueous Solution

23-Jul-2015 | Guoyong Wang; Ping Li; Zhiping Du; Wanxu Wang; Guojin Li, Langmuir, 2015

Six novel siloxane-based surface-active ionic liquids (SAILs)—siloxane ammonium carboxylate [Si(n)N(2)-CA(1), (n = 3, 4)]—were designed and synthesized. Their melting points, surface activities, and self-aggregation behavior in aqueous solution were studied. The results showed that because of the ...

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Preparation and Cationic Dye Adsorption of Novel Fe3O4 Supermagnetic/Thiacalix[4]arene Tetrasulfonate Self-Doped/Polyaniline Nanocomposite: Kinetics, Isotherms, and Thermodynamic Study

22-Jul-2015 | Moslem Mansour Lakouraj; Rafieh-Sadat Norouzian; Soheila Balo, Journal of Chemical & Engineering Data, 2015

In this study, a novel magnetically separable nanoadsorbent, namely, Fe3O4@PAmABAmPD-TCAS consisting of a magnetite core and conductive terpolymer of aniline/m-aminobenzoicacid/m-phenilendiamine shell which was self-doped by protonic acid of thiacalixarene tetrasulfonate pendent groups has been ...

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A Mechanistic Study on the Oxidative Degradation of Dibenzazepine Derivatives by Manganese(III) Complexes in Acidic Sulfate Media

21-Jul-2015 | Joanna Wiśniewska, Grzegorz Wrzeszcz, International Journal of Chemical Kinetics, 2015

ABSTRACT The oxidative degradation of tricyclic antidepressants (TCA) was studied in the presence of a large excess of the oxidizing agent manganese(III) and its reduced form manganese(II) sulfate in acidic media. The products were detected and identified using UV–vis, ESI‐MS, IR, and EPR ...

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Novel Access to Propagation Rate Coefficients of Radical Polymerization by the SP–PLP–EPR Method

21-Jul-2015 | Hendrik Kattner, Patrick Drawe, Michael Buback, Macromolecular Chemistry and Physics, 2015

A novel method for kp measurement is presented, in which time‐resolved electron paramagnetic resonance detection of radical concentration after applying a single laser pulse (SP−PLP−EPR) is carried out in conjunction with measuring monomer conversion induced by the laser pulse. The method is ...

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Fabrication of polyvinyl chloride based nanocomposite nanofiltration membrane: investigation of SDS/Al2O3 nanoparticle concentration and solvent ratio effects

21-Jul-2015 | E. Bagheripour, A. R. Moghadassi, S. M. Hosseini, Asia-Pacific Journal of Chemical Engineering, 2015

Abstract In the current research polyvinylchloride‐based nanocomposite nanofiltration membranes were prepared by using of sodium dodecyl sulfate (SDS) as additive, aluminum oxide (Al2O3) nanoparticles as inorganic filler and dimethylacetamide (DMAC)/tetrahydrofuran (THF) as solvents via phase ...

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Fabrication of Three-Layer-Component Organoclay Hybrid Films with Reverse Deposition Orders by a Modified Langmuir–Schaefer Technique and Their Pyroelectric Currents Measured by a Noncontact Method

21-Jul-2015 | Masanari Hirahara; Yasushi Umemura, Langmuir, 2015

In an aqueous clay mineral (montmorillonite) dispersion at a low concentration, isolated clay nanosheets with negative charges were suspended. When a solution of amphiphilic octadecylammonium chloride (ODAH+Cl–) was spread on an air-dispersion interface, the clay nanosheets were adsorbed on the ...

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