Synthesis and characterization of composite polysulfone membranes for desalination in nanofiltration technique

2010 ◽  
Vol 62 (11) ◽  
pp. 2655-2663 ◽  
Author(s):  
A. Akbari ◽  
M. Homayonfal ◽  
V. Jabbari
Keyword(s):  
Acrylic Acid ◽  
Polyacrylic Acid ◽  
Graft Polymerization ◽  
Irradiation Time ◽  
Polymerization Process ◽  
Synthesis And Characterization ◽  
Porous Support ◽  
Ft Ir

Composite nanofiltration (NF) membrane was developed polyacrylic acid (PAA) in situ UV graft polymerization process using ultrafiltration (UF) polysulfone (PSF) membrane as porous support. FT-IR spectra indicated that grafting was performed and it show peaks at 1,732 cm−1 and 3,396 cm−1 region for CO and OH starching bond of acrylic acid (AA) monomer, respectively. AFM microscopy showed the roughness of surface was reduced by increase of UV irradiation times. Effect of irradiation time on the grafting of acrylic acid (AA) in the same concentration was discussed. The salts rejection increase was accompanied with grafting of polysulfone (PSF) ultrafiltration (UF) membrane. The rejection of Na2SO4, MgSO4, NaCl and CaCl2 salts by PSF-grafted-PAA nanofiltration (NF) membrane was in 98, 60, 52 and 30% respectively, under 0.3 MPa.

Preparation and Characterization of PMAA/SiO2 Composite Particle Via Emulsion Polymerization

2012 ◽  
Vol 528 ◽  
pp. 184-187 ◽  
Author(s):  
Ke Hong Zhang ◽  
Jun Juan Du ◽  
Hui Xiao ◽  
Yan Yuan
Keyword(s):  
Acrylic Acid ◽  
Emulsion Polymerization ◽  
Silica Gel ◽  
Graft Polymerization ◽  
Polymer Layer ◽  
Grafted Polymer ◽  
Chemically Modified ◽  
Ft Ir ◽  
Silica Gel Particles

Silica gel particle was chemically modified by using 3-methacryloxypropyl trimethoxysilane (KH-570) as coupling agent. Then poly methyl acrylic acid (PMAA) was grafted on the surface of particles MPS-SiO2 with the method of Emulsion Polymerization, and grafting particles PMMA/SiO2 were prepared. The grafting particle PMAA/SiO2 was characterized by using FT-IR, TG and SEM. The experimental results show that the graft polymerization of methyl acrylic acid (MAA) on onto the surface of silica gel particles can successfully realized using the method of “graft from”. During the graft polymerization, the grafted polymer layer is a hindrance to the subsequent graft polymerization. When the grafted polymer layer reach to a certain density via overlapping and entwisting, a kinetic barrier will be built up. Hence, the grafting degree of the polymer under a certain condition has a limiting value.

Synthesis and Characterization of Temperature-Sensitive TSPU/PNIPAAm Semi-IPN Polymer

2011 ◽  
Vol 399-401 ◽  
pp. 359-362 ◽  
Author(s):  
Yi Chun Wang ◽  
Zheng Wei Dai ◽  
Yuan Xue
Keyword(s):  
Chemical Structure ◽  
In Situ Polymerization ◽  
Phenyl Isocyanate ◽  
Chain Extender ◽  
Synthesis And Characterization ◽  
Temperature Sensitive ◽  
Sensitive Material ◽  
Ft Ir

Thermo-sensitive polyurethane (TSPU) was synthesized from poly(ε-caprolactone) and 4,4’-methylenebis (phenyl isocyanate) by a two-step process with 1,4-butanediol as the chain extender. Following that, a novel temperature-sensitive material was created by the strategy of IPN from TSPU and PNIPAAm in the method of in situ polymerization. The chemical structure and thermo properties of the semi-IPN were characterized with FT-IR and DSC. The results prove that intensive inter-molecular interactions exist between TSPU and PNIPAAm chains, which have significant influence on the phase transition behaviors of the material. According to these results, the transition temperature of the semi-IPN can be adjusted in the range of 30~40 °C by controlling the composition of TSPU and the semi-IPNs.

Synthesis and Characterization of a Novel Superabsorbent Polymer Based on Konjac Glucomannan

2010 ◽  
Vol 148-149 ◽  
pp. 1567-1570
Author(s):  
Ai Xia Lu ◽  
Yang Luo ◽  
Xue Gang Luo ◽  
Jian Ye
Keyword(s):  
Acrylic Acid ◽  
Graft Polymerization ◽  
Konjac Glucomannan ◽  
Synthesis And Characterization ◽  
Water Absorbency ◽  
Distilled Water ◽  
Superabsorbent Polymer ◽  
Nacl Solution ◽  
Factors Influencing

A novel konjac glucomannan-g-poly(acrylic acid) superabsorbent with water absorbency of 380.8g/g in distilled water and 54.3 g/g in 0.9 wt% NaCl solution was prepared by graft polymerization with konjac glucomannan and acrylic acid in aqueous solution, using N, N’- methylene bisacrylamide as a crosslinker and potassium persulfate as an initiator. Factors influencing water absorbency of the superabsorbent polymer were investigated, such as the neutralization degree of acrylic acid, the amount of crosslinker and initiator.

Synthesis and Characterization of New Polyimide/Organoclay Nanocomposites Derived From 3,3′,4,4′-Biphenyltetracarboxylic Dianhydride and 1,2-Bis(4-Aminophenoxy)Ethane

2013 ◽  
Vol 32 (2) ◽  
pp. 171-178 ◽  
Author(s):  
Akram Feyzi ◽  
Khalil Faghihi ◽  
Abdol Ali Zolanvari
Keyword(s):  
Clay Content ◽  
Nanocomposite Films ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ft Ir ◽  
Biphenyltetracarboxylic Dianhydride ◽  
Ft Ir Spectroscopy

AbstractA series of nanocomposites consist of organic polyimide and organo-modified clay content varying from 0 to 10 mass%, were successfully prepared by in situ polymerization. Polyimide used as a matrix of nanocomposite was prepared through the reaction of 1,2-bis(4-aminophenoxy)ethane (BAE) and 3,3′,4,4′-biphenyltetracarboxylic dianhydride (BPDA) in N,N-dimethylacetamide (DMAC). The resulting nanocomposite films were characterized by FT-IR spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM) and thermogravimetric analysis (TGA).

Synthesis and characterization of nanocomposites based on aniline and pyrrole in montmorillonite

2021 ◽  
Author(s):  
ouiddad saiah ◽  
Ahmed Yahiaoui ◽  
Aicha Hachemaoui
Keyword(s):  
Fourier Transform ◽  
Ammonium Persulfate ◽  
Synthesis And Characterization ◽  
Chemical Polymerization ◽  
Vis Spectroscopy ◽  
Ft Ir ◽  
Poly Aniline ◽  
Ft Ir Spectroscopy

Abstract In this study, nanostructured composites based on montmorillonite (MMT), polypyrrole and aniline (poly(pyrrole-co-aniline)/MMT) were prepared via in-situ chemical polymerization of aniline and pyrrole in the presence of montmorillonite and ammonium persulfate as oxidants. Pyrrole and aniline were introduced to MMT-H+ and polymerized within the interlayer to obtain polypyrrole/MMT-H+,polyaniline/MMT-H+ and poly(aniline-co-pyrrole)/MMT-H+ nanocomposites.The nanocomposite copolymer and homopolymer compositions were also characterized by Fourier transform infrared(FT-IR) spectroscopy, UV–Vis spectroscopy, X-raydiffraction and electrochemical response,the results show that what we obtain is really a nanocomposite.

Facile in situ synthesis and characterization of a novel PANI/Fe3O4/Ag nanocomposite and investigation of catalytic applications

RSC Advances ◽  
2016 ◽  
Vol 6 (101) ◽  
pp. 98777-98787 ◽  
Author(s):  
Ali Maleki ◽  
Hamed Movahed ◽  
Parisa Ravaghi ◽  
Tooraj Kari
Keyword(s):  
Catalytic Activity ◽  
Sem Analysis ◽  
In Situ Synthesis ◽  
Synthesis And Characterization ◽  
Hybrid Nanocomposite ◽  
Ft Ir ◽  
Catalytic Applications

A novel magnetic hybrid nanocomposite was successfully synthesized via in situ polymerization, well characterized by FT-IR, XRD, EDX and FE-SEM analysis, and its catalytic activity shown in the synthesis of pharmaceutically important pyrans.

Synthesis and characterization of an in-situ Al2O3/Al–Cu composite with a heterogeneous structure

2021 ◽  
Vol 868 ◽  
pp. 159283
Author(s):  
Tong Gao ◽  
Lingyu Liu ◽  
Jinpeng Song ◽  
Guiliang Liu ◽  
Xiangfa Liu
Keyword(s):  
Synthesis And Characterization ◽  
Heterogeneous Structure
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