Papers by Keyword: Polyethersulfone

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Authors: Jing Diao, Jian Feng Xu, Song Tao Li, Xiao Hui Cao, Chun Yi Liu, Chun Ju He
Abstract: Polyethersulfone (PES) flat sheet membranes were prepared via phase inversion induced by immersion precipitation from a novel lower critical solution temperature (LCST) system containing PES, 1-butanol and N, N-dimethylacetamide. And the effect of coagulation bath temperature on the properties and structure of PES membranes were investigated. The results show that the pure water flux increases and the tensile strength decreases as the coagulation temperature increases form 20°C to 50°C. Besides, the SEM images shows that all of the membranes prepared from a LCST system at different CBT own sponge-like structures.
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Authors: Dong Jiang, Xiao Ran Zhang, Yan Mei Ma, Cheng You Ma
Abstract: polycarbonate (PC), polyethersulfone (PES) and a multi-block random copolymer of PES and PC were blended. It was found that the interfacial adhesion was enhanced, the size of the dispersed phase was reduced and PES and PC formed an interlocking structure with the copolymer, which suggest the addition of the compatibizer may improved the miscibility between PES and PC, and result in the improvement of the mechanical properties of the blends. The compatibility behavior of PES with PC was examined using differential scanning calorimeter (DSC), scanning electron microscope (SEM) and SAXS.
1601
Authors: Cheng You Ma, Yan Mei Ma, Zhi He, Chen Yan, Dong Jiang
Abstract: Double block copolymers of polyethersulfone (PES)/polycarbonate (PC) were used as a compatibilizer for a blend of PES/PC. The morphology, thermal properties, mechanical properties, etc. of the resulting ternary blend systems were investigated. The addition of the compatibizer improved the compatibility between PES and PC. It was found that the interfacial adhesion was enhanced; the size of the dispersed phase was reduced. This resulted in an improvement of elongation at break and tenacity of PES/PC blends, while the tensile modulus slightly increased, and tensile strength was almost constant.
858
Authors: Jin Li Zhou, Shu Zhu, Wen Pin Jia, Chao Cheng, Elwathig A.M. Hassan, Mu Huo Yu
Abstract: In order to improve the toughness of epoxy resin, hydroxyl-terminated polyethersulfone (PES) with various amounts (0 wt.%, 5 wt.%, 10 wt.%, 15 wt.%, 20 wt.%) were added to bisphenol A epoxy resin (DER331)/ curing agent DETDA (E100) systems, and the influence of PES contents on curing process and heat-resistance was studied. Non-isothermal DSC was used to determine the curing process of uncured DER331/E100/PES systems at heating rate of 2°C/min, 5°C/min, 7°C/min, 10°C/min and 15°C/min separately, and the apparent activation energy was calculated based on Kissinger method. The morphology of the etched cured DER331/E100/PES systems with different PES contents was observed by SEM. The heat-resistance of these systems was investigated by DSC and TGA. The results showed that with the increasing of PES content the curing exothermic peak, the heat of curing reaction, the initial and final curing temperature all decreased at the first and then increased, indicating that when the PES content was low (5 wt.%, 10 wt.%), PES can facilitate the curing process, while, when PES content up to 15 wt.%, PES can prevent or weaken the curing reaction. SEM results indicated that the phase structure changed drastically depending on the PES content. The systems with 5 wt.% and 10 wt.% PES were epoxy-rich phase, with 15 wt.% PES was co-continuity phase, and with 20 wt.% PES showed complete phase inversion (PES rich phase). The glass transition temperature and thermo gravimetric analysis demonstrated that the addition of PES can increase the heat resistance of cured DER331/E100/PES systems.
2302
Authors: Iqbal Ahmed, Ani Idris, Muhammad Saad Khan, Sujan Chowdhury, Junaid Akhtar
Abstract: In the present study, polyethersulfone (PES) dope solution were prepared from mixtures of two solvents containing dimethylformamide (DMF) as core solvent, and acetone as co-solvent (CS), deionized water was used as coagulant bath. The amount of PES was kept at 20 wt% and the weight ratios of acetone were varied 20-24 wt.% to DMF and the dope solutions were prepared under closed heating system Results revealed the complete miscibility of PES with the fixed mixture of acetone and DMF under atmospheric pressure. The relationships between degree of adsorption, relative water absorption, were investigated. The results revealed that the interaction of DMF and acetone is strongest when their mole ratio is unity, which exhibit the phenomenon of true cosolvency for PES membrane. Keywords: polyethersulfone, solvent mixture, characterization.
545
Authors: Hamdy F.M. Mohamed, A. Ohira, Yoshinori Kobayashi
Abstract: The mechanism of gas permeation in sulfonated polymers such as Nafion and sulfonated polyethersulfone (SPES) for polymer electrolyte fuel cells has been investigated from the viewpoint of free volume. Free volume was quantified using the positron annihilation lifetime (PAL) technique and O2 permeability was measured as a function of temperature or ion exchange capacity (IEC). Good linear correlations between the logarithm of the permeabilities and reciprocal free volume indicate that gas permeation in the sulfonated polymers depends strongly on the free volume. Comparison of Nafion with SPES and other relatively flexible chain polymers showed that the stiff chains of the perfluoroethylene backbone in Nafion make the O2 permeability much smaller than the corresponding flexible chain polymer with a similar free volume size. The O2 permeability in the K+-form of Nafion is systematically smaller than the H+-form, showing that the chain stiffness is enhanced by the ion exchange.
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Authors: Samaneh Shahgaldi, Zahira Yaakob, Mostafa Ghasemi, Wan Ramli Wan Daud, Dariush Jafar Khadem
Abstract: One dimensional (1D) nanostructure materials such as nanowires, nanofibers, and nanorods with porous structures have potential for use in various applications. Electrospinning is one of the versatile techniques with the ability of producing cost-effective, large production, highly porous nanofibers and membrane with large surface to volume ratios. Poly ether sulfone (PES) is a kind of special engineering plastic with good processing characteristics. In this paper, synthesis of PES membrane was investigated by two main methods, i.e. phase inversion and electrospiing. For electrospining, the main effective parameters such as concentration of polymer and solvent, for finding the optimized condition of electrospun PES membrane was studied. The produced membranes were characterized by SEM for morphology and BET observation of surface area, permeability, flux, and mechanical propertise for different applications.
607
Authors: Ping Lan, Wei Wang, Jian Da Cao
Abstract: Polyethersulfone (PES) hollow fiber membranes have been widely used in many fields, such as ultrafiltration, microfiltration, reverse osmosis, liquid/liquid or liquid/solid separation, gas separation, hemodialysis, and so on. In this paper, the sheet PES hollow fiber membranes were prepared and post-processing of membranes were studied. Suction method and pressing hot water method can both increase pure water flux of membrane. Suction method is more efficient and with a smaller time to increase pure water flux. After membrane was soaked into glycerol/water solution, pure water flux of membrane increased greatly and the length shrinkage ratio of the membrane was more smaller.
2389
Authors: Dong Jiang, Xiao Ran Zhang, Cheng You Ma, Hong Su Wang
Abstract: The blends of Polyethersulfone (PES) and MCM-22,49,56 were prepared by melt mixing in a Brabender-like apparatus. The specimens for measurements were made by compression molding under pressure and then were water-quenched at room temperature. The miscibility behavior of PES and MCM-22,49,56 was examined using differential scanning calorimeter (DSC), scanning electron microscope (SEM), and density.
1611
Authors: Han Min Wang, Xue Li Gao, Bao Wei Su, Cong Jie Gao
Abstract: The polyethersulfone ultra-filtration membrane was prepared by phase inversion method using polyethersulfone(PES), polyethylene glycol 400(PEG400) and N,N- dimethylamide(DMAC) as materials, and was modified by adding a capsaicin monomer named MBHBA which possess antibacterial property. The effects of MBHBA content on the ultra-filtration membrane performance were discussed. The results showed that the addition of MBHBA monomer effectively increased the membrane flux. And the modified membrane had strong inhibitory activity against Escherichia coli.
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