SURFACE MODIFICATION OF POLYANILINE ONTO PVDF MEMBRANE VIA RADIATION INDUCED GRAFTING

2015 ◽  
Vol 77 (1) ◽  
Author(s):  
Nadiah Khairul Zaman ◽  
Rosiah Rohani ◽  
Abdul Wahab Mohamad
Keyword(s):  
Vinylidene Fluoride ◽  
Conductive Polymer ◽  
Monomer Concentration ◽  
Scanning Calorimetry ◽  
Pvdf Membrane ◽  
X Ray ◽  
Poly Vinylidene Fluoride ◽  
Radiation Induced ◽  
Conductive Properties ◽  
Radiation Induced Grafting

A conductive polymer, polyaniline (PANI) has been grafted onto a poly (vinylidene fluoride) (PVDF) based polymer using simultaneous radiation induced grafting (RIG), which is a new approached in introducing the conductive properties into a preformed polymer for potential selective separation ability during filtration process. The possibility of coating PVDF membrane with PANI was investigated by looking at the effect of monomer concentration, radiation dose, and aniline in emulsion form on the degree of grafting (DOG). The DOG were obtained at 4.44 and 5.43 % for aniline concentration and its emulsion respectively, and increases with the increase in concentration. The PANI-grafted-PVDF membrane was also characterized using Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy/energy dispersive x-ray spectroscopy (SEM/EDX) and differential scanning calorimetry (DSC) techniques. The FTIR and SEM results show that PANI was successfully grafted onto PVDF membrane. EDX analysis also confirmed the grafting by the presence of NH2 representing aniline in the PANI-grafted-PVDF membranes. The modification was found to have not change the overall properties of PVDF, still retaining its intrinsic properties.

Effect of Thermal Treatment on the Physical Properties of Electrospun PVDF Membrane

2012 ◽  
Vol 591-593 ◽  
pp. 1113-1116
Author(s):  
Si Chen Cheng ◽  
Yin Zheng Liang ◽  
Yi Ping Qiu
Keyword(s):  
Thermal Treatment ◽  
Tensile Property ◽  
Tensile Testing ◽  
Vinylidene Fluoride ◽  
X Ray Diffraction ◽  
Electrospinning Technique ◽  
Pvdf Membrane ◽  
X Ray ◽  
Before And After ◽  
Poly Vinylidene Fluoride

The electrospinning technique was used to produce poly (vinylidene fluoride) (PVDF) membrane. Thermal treatment was introduced to improve the mechanical property and dimensional stability. In this paper, the PVDF membranes before and after thermal treatment were characterized by Scanning electron microscope (SEM), differential scanning calorimeter (DSC) and wide angle X-ray diffraction (WAXD), tensile testing. The crystallinity, tensile property, as well as melting temperature changed with the treated temperature. The results hows that thermal treatment could notably increase the tensile property of electrospun PVDF membrane and 160°C is a proper temperature for thermal treating

Enhancement of X-ray Shielding Properties of PVDF/BaSO4 Nanocomposites Filled with Graphene Oxide

MRS Advances ◽  
2019 ◽  
Vol 4 (3-4) ◽  
pp. 169-175
Author(s):  
Liliane A. Silva ◽  
Adriana M. S. Batista ◽  
Tiago Serodre ◽  
Annibal T. B. Neto ◽  
Clascidia A. Furtado ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Vinylidene Fluoride ◽  
Negative Thermal Expansion ◽  
Graphene Sheets ◽  
Scanning Calorimetry ◽  
Bending Vibration ◽  
Attenuation Coefficients ◽  
X Ray ◽  
Poly Vinylidene Fluoride ◽  
Dispersion State

ABSTRACTIn this work, we report evidences of the improvement of X-ray attenuation efficiency by the addition of a very small amount of Graphene Oxide (GO) in polymer-based nanocomposite. Poly(vinylidene fluoride) (PVDF) homopolymer and barium sulfate (BaSO4) nanoparticles were mixed. PVDF/BaSO4 nanocomposite was found to attenuate 9.14% of a 20 kV X-ray beam. The addition of only 4.0 wt % of GO nanosheets to the nanocomposite improved this X-Ray attenuation efficiency to 24.56%. The respective linear attenuation coefficients (μ) were 39.9 cm-1 and 54.4 cm-1, respectively. The X-ray attenuation gradually decreases until 6.71% and 17.62%, respectively, for the X-ray beam with higher energy (100 kV). Fourier transform infrared data revealed that, due to the lack of the bending vibration modes of CF2 molecule at 656 cm-1, 688 cm-1, 723 cm-1, 776 cm-1and 796 cm-1, characteristics of the γ-crystalline phase of PVDF, the nanocomposites casted from solution are mostly in the β-ferroelectric phase of PVDF, besides the γ-paraelectric phase. SEM micrographs were used to evaluate the dispersion state of graphene sheets and the BaSO4 nanoparticles into the polymeric matrix. UV-Vis spectrometry and Differential Scanning Calorimetry (DSC) were also performed in order to complement the structural analysis. The results confirm that the addition of graphene sheets in PVDF polymer-based nanocomposites enhances the X-ray shielding efficiency. The phenomenon is discussed in terms of the reported anomalous negative thermal expansion coefficient of graphene sheets

scholarly journals Phase Transitions in Poly(vinylidene fluoride)/Polymethylene-Based Diblock Copolymers and Blends

Polymers ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2442
Author(s):  
Nicolás María ◽  
Jon Maiz ◽  
Daniel E. Martínez-Tong ◽  
Angel Alegria ◽  
Fatimah Algarni ◽  
...  
Keyword(s):  
Diblock Copolymers ◽  
Vinylidene Fluoride ◽  
Polarized Light ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Preparation Conditions ◽  
X Ray Scattering ◽  
Transmission Electron ◽  
Poly Vinylidene Fluoride ◽  
Ray Scattering

The crystallization and morphology of two linear diblock copolymers based on polymethylene (PM) and poly(vinylidene fluoride) (PVDF) with compositions PM23-b-PVDF77 and PM38-b-PVDF62 (where the subscripts indicate the relative compositions in wt%) were compared with blends of neat components with identical compositions. The samples were studied by SAXS (Small Angle X-ray Scattering), WAXS (Wide Angle X-ray Scattering), PLOM (Polarized Light Optical Microscopy), TEM (Transmission Electron Microscopy), DSC (Differential Scanning Calorimetry), BDS (broadband dielectric spectroscopy), and FTIR (Fourier Transform Infrared Spectroscopy). The results showed that the blends are immiscible, while the diblock copolymers are miscible in the melt state (or very weakly segregated). The PVDF component crystallization was studied in detail. It was found that the polymorphic structure of PVDF was a strong function of its environment. The number of polymorphs and their amount depended on whether it was on its own as a homopolymer, as a block component in the diblock copolymers or as an immiscible phase in the blends. The cooling rate in non-isothermal crystallization or the crystallization temperature in isothermal tests also induced different polymorphic compositions in the PVDF crystals. As a result, we were able to produce samples with exclusive ferroelectric phases at specific preparation conditions, while others with mixtures of paraelectric and ferroelectric phases.

Enhancing antimicrobial properties of poly(vinylidene fluoride)/hexafluoropropylene copolymer membrane by electron beam induced grafting of N-vinyl-2-pyrrolidone and iodine immobilization

RSC Advances ◽  
2016 ◽  
Vol 6 (48) ◽  
pp. 42461-42473 ◽  
Author(s):  
Ahmed Ibrahim Shawky ◽  
Megat Johari Megat Mohd Noor ◽  
Mohamed Mahmoud Nasef ◽  
Mohamed Khayet ◽  
Madana Nallappan ◽  
...  
Keyword(s):  
Electron Beam ◽  
Vinylidene Fluoride ◽  
Antimicrobial Properties ◽  
Poly Vinylidene Fluoride ◽  
Radiation Induced ◽  
Radiation Induced Grafting

NF membrane with excellent antimicrobial and antifouling properties by EB radiation induced grafting of N-vinylpyrrolidone followed by iodine immobilisation.

Poly(vinylidene fluoride) (PVDF) Membrane Preparation with an Ionic Liquid via Thermally Induced Phase Separation Melt Technology

2014 ◽  
Vol 694 ◽  
pp. 462-465 ◽  
Author(s):  
Zhen Liu ◽  
Dao Bao Sun ◽  
Wen Yang Dong ◽  
Shuan Hu Feng ◽  
Chang Fa Xiao ◽  
...  
Keyword(s):  
Phase Separation ◽  
Vinylidene Fluoride ◽  
Preparation Method ◽  
Thermally Induced Phase Separation ◽  
X Ray Diffraction ◽  
Pvdf Membrane ◽  
Thermally Induced ◽  
X Ray ◽  
Flat Sheet ◽  
Poly Vinylidene Fluoride

Poly(vinylidene fluoride) (PVDF)/1-butyl-2,3-dimethylimidazolium Tetrafluoroborate ([BMMIm][BF4]) flat sheet membranes were made via thermally induced phase separation (TIPS) melt technology, and [BMMIm][BF4]) was used as a diluent. The prepared membranes were characterized using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM) and etc. Furthermore, [BMMIm][BF4] as a liquid-diluent was effectively recovered by vacuum distillation. In conclusion, this work may provide a green and sustainable preparation method to produce PVDF membranes via TIPS.

Sign in / Sign up

Export Citation Format

Share Document