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Influence of Co‐Solvent Concentration on the Properties of Dope Solution and Performance of Polyethersulfone Membranes

10-09-2013 | I. Ahmed, A. Idris, A. Hussain, Z. A. M. Yusof, M. Saad Khan, Chemical Engineering & Technology, 2013

Abstract Polyethersulfone (PES) dope solutions were prepared from mixtures of two solvents containing N,N‐dimethylformamide (DMF) as core solvent and acetone as co‐solvent (CS) in a closed heating system. PES asymmetric membranes were cast by a dry/wet phase inversion process. Complete ...

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High‐Pressure Generator of Singlet Oxygen

06-09-2013 | V. Jirásek, M. Čenský, O. Špalek, J. Kodymová, Chemical Engineering & Technology, 2013

Abstract The generation of gaseous singlet oxygen by gas‐liquid reaction of chlorine with alkaline solution of hydrogen peroxide in spray form was studied experimentally on the originally designed device with a fast separation of reacted liquid from gas. The singlet oxygen yield, residual ...

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Effect of ZnO nanoparticles on the electrospinning of poly(vinyl alcohol) from aqueous solution: Influence of particle size

27-08-2013 | Tongsai Jamnongkan, Ryo Shirota, Sathish K. Sukumaran, Masataka Sugimoto, Kiyohito Koyama, Polymer Engineering and Science, 2013

Recently, interest in nonwoven mats composed of fibers manufactured by drawing polymer solutions or melts with suspended nanoparticles has been growing due to exciting opportunities for use in biomedical applications. Poly(vinyl alcohol) (PVA), due to its biocompatibility, and zinc oxide (ZnO), ...

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Corrosion behaviour of steel/55%Al–Zn alloy/paint systems exposed to natural and artificial environments

23-08-2013 | Cecilia I. Elsner, Delia B. del Amo, Luis S. Hernández, Alejandro R. Di Sarli, The Canadian Journal of Chemical Engineering, 2013

Abstract The corrosion performance of steel/55%Al–Zn alloy sheets pre‐treated with 5% Fe (NO3)3 + 15% H3PO4 solution, and then coated with acrylic (AC), alkyd (AQ), vinyl (VL), solvent‐based epoxy (ES) or waterborne epoxy (EA) corrosion‐inhibiting primers + a barrier topcoat alkyd paint was ...

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Limits to expanding the PN‐F series of polyphosphazene elastomers

19-08-2013 | Zhicheng Tian, Xiao Liu, Abdellatif Manseri, Bruno Ameduri, Harry R. Allcock, Polymer Engineering and Science, 2013

Mixed‐substituent fluoroalkoxyphosphazene polymers bearing ∼15% 1H,1H,2H,2H‐perfluorooctan‐1‐oxy or 1H,1H,2H,2H‐perfluorodecan‐1‐oxy side groups together with trifluoroethoxy cosubstituent groups were synthesized. The low reactivity of the long‐chain fluoroalkoxides and their limited solubility ...

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Synthesis and properties of poly(aryl ether ketone)‐based phthalonitrile resins

13-08-2013 | Tao Liu, Yanhua Yang, Tingting Wang, Haibin Wang, Hang Zhang, Yu Su, Zhenhua Jiang, Polymer Engineering and Science, 2013

A series of poly(aryl ether ketone) oligomers containing phthalonitrile were synthesized by a direct solution polycondensation, and characterized by fourier transform infrared spectroscopy and hydrogen nuclear magnetic resonance. Differential scanning calorimetry results showed the oligomers had ...

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Preparation and characterization of liquid crystalline polyurethane‐imide modified epoxy resin composites

13-08-2013 | Dayong Gui, Xue Gao, Jingfeng Hao, Jianhong Liu, Polymer Engineering and Science, 2013

Liquid crystalline polyurethane‐imide (PUI) was synthesized from polyethyleneglycol, toluene diisocyarate, and pyromellitic dianhydride by solution polymerization and characterized by FTIR spectrum. The liquid crystal properties of PUI were verified by differential scanning calorimetry, ...

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Synthesis and properties of novel copolymers of poly(ether ketone diphenyl ketone ether ketone ketone) and poly(ether amide ether amide ether ketone ketone)

09-08-2013 | Bin Huang, Jiangping Qian, Guixia Wang, Mingzhong Cai, Polymer Engineering and Science, 2013

New monomers, 4,4′‐bis(4‐phenoxybenzoyl)diphenyl (BPOBDP) and N,N′‐bis(4‐phenoxybenzoyl)−4,4′‐diaminodiphenyl ether (BPBDAE), were conveniently synthesized via simple synthetic procedures from readily available materials. Novel copolymers of poly(ether ketone diphenyl ketone ether ketone ketone) ...

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Tough polyamide 6/core–shell blends prepared via in situ anionic polymerization of ε‐caprolactam by reactive extrusion

09-08-2013 | Dongguang Yan, Guang Li, Mingyue Huang, Chao Wang, Polymer Engineering and Science, 2013

In this study, the molten ε‐caprolactam (CL) solution of maleated styrene‐ethylene/butylene‐styrene block copolymer (SEBS‐g‐MA) and polystyrene (PS) containing catalyst and activator were introduced into a twin screw extruder, and polyamide 6 (PA6)/SEBS/PS blends were successfully prepared via ...

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Regeneration of a Commercial Catalyst for the Dehydrogenation of Isobutane to Isobutene

08-08-2013 | S. K. Masoudian, S. Sadighi, A. Abbasi, F. Salehirad, A. Fazlollahi, Chemical Engineering & Technology, 2013

Abstract In the chemical and petrochemical industries, dehydrogenating of hydrocarbons to olefins as raw materials for the manufacture of various chemical products is an important economic issue. So, here, the redispersion and regeneration of a commercial Pt‐Sn/γ‐Al2O3 catalyst utilized for ...

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