Characterization of poly(vinyl pyrrolidone) modified polyaniline prepared in stable aqueous medium

Ghosh, Premamoy; Siddhanta, Samir K.; Chakrabarti, Amit

doi:10.1016/s0014-3057(98)00157-8

Cited by 158 publications

(70 citation statements)

References 21 publications

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“…Stejskal et al 11 in their studies on PANI-PVP dispersions reported the formation of spherical PANI particles. Ghosh et al 13 in their studies on PANI-PVP composites reported the variation in the morphology of PVP-supported PANI microparticles from a finer, grainlike morphology to a somewhat larger spherical or oblong morphology.…”

Section: Scanning Electron Microscopy (Sem) Analysis Of the Pani-pvp mentioning

confidence: 99%

Benzoyl peroxide as a novel oxidizing agent in a polyaniline dispersion: Synthesis and characterization of a pure polyaniline–poly(vinyl pyrrolidone) composite

Palaniappan¹,

Sairam²

2008

J of Applied Polymer Sci

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Benzoyl peroxide was used as a novel oxidizing agent in the preparation of a polyaniline (PANI) dispersion. Aniline was oxidized by benzoyl peroxide into a PANI dispersion in the presence of poly(vinyl pyrrolidone) (PVP) as a stabilizer. A pure PANI dispersion in water was prepared by the dispersion of the isolated wet and dry forms of PANI powder. The size of the PANI particles in the water medium was measured for the reaction mixture and wet and dry composites with a particle size analyzer and a zeta sizer. The hydrodynamic diameter of the PANI particles ranged from 435 to 970 nm. The size of the PANI particles was found to be lower in the wet composite. PANI particles with a lower volume mean diameter (140 nm) and narrow size distribution (100-190 nm) were observed in the PANI-PVP wet composite. The PANI dispersion was characterized with Fourier transform infrared, ultraviolet-visible, differential scanning calorimetry, and scanning electron microscopy measurements.

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Section: Scanning Electron Microscopy (Sem) Analysis Of the Pani-pvp mentioning

confidence: 99%

Benzoyl peroxide as a novel oxidizing agent in a polyaniline dispersion: Synthesis and characterization of a pure polyaniline–poly(vinyl pyrrolidone) composite

Palaniappan¹,

Sairam²

2008

J of Applied Polymer Sci

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“…These attractive features make CE suitable for use in high-performance composites such as printed circuit boards and structural composites for the aerospace and microelectronic industries. [1][2][3][4][5] Therefore, CE resin has become an increasingly important class of matrix resins since its development in the early 1970s. However, the application of CE has been limited by its poor flexibility, high melting or softening temperature, and high brittleness.…”

Section: Introductionmentioning

confidence: 99%

Preparation and properties of cyanate ester modified by epoxy resin and phenolic resin

Sheng-hua

Zhou

et al. 2006

J of Applied Polymer Sci

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Stiff and brittle cyanate ester (CE) resin was modified by copolymerizing it with epoxy resin (ER) and phenolic resin (PR) to improve its toughness and flexibility. The cure process of the modified CE resin was characterized by gel time curves and differential scanning calorimetry curves. The Fourier transform infrared spectra of the modified CE resin showed its chemical structure during the curing process. The mechanical properties, thermal behavior, dielectric properties, and morphology of the modified CE resins were investigated. The results showed that an increase in epoxy and phenolic resins resulted in improved flexibility while maintaining thermal stability. When the mass ratio of CE/ER/PR was 70 : 15 : 15 (w/w), flexural strength and impact strength of the modified CE resin increased from 113.6 MPa and 5.2 kJ/m 2 to 134.5 MPa and 16.7 kJ/m 2 , respectively. Little of the thermal stability and dielectric properties was sacrificed in the modification of the CE.

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“…2). The peak at 390 -400 nm region is associated with "exciton" transition (polaron/bipolaron transition) caused by interband charge-transfer from the benzenoid to the quinoid moieties of the protonated poly(o-toluidine) (POT) 7,18 (Scheme 2). In the spectrum of DMF solution of doped-POT, the "exciton" transition band, however, appears in the 415 nm region [ Fig.…”

Section: Uv-visible Absorption Spectramentioning

confidence: 99%

“…[1][2][3][4][5][6][7] Water soluble polymers reported to be used for polymerization of aniline in acidic condition are poly(2-vinylpyridine-cop-amino-styrene), 1 poly(vinyl alcohol), 2,3 poly-(vinyl methyl ether), 4 poly(acrylic acid), 5 poly-(ethylene oxide), 6 and poly(vinyl pyrrolidone). 7 A more recent report relates to preparation of blends of poly(o-toluidine) or poly(m-toluidine) with polystyrene employing emulsion or solution techniques. 8,9 As a water soluble polymer, polyacrylamide, PAAm is known to act as an efficient flocculant of aqueous suspensions of clay and related materials.…”

Section: Introductionmentioning

confidence: 99%

Studies on stable aqueous poly(o-toluidine) prepared with the use of a water soluble support polymer, polyacrylamide

Ghosh

Siddhanta

1999

J. Polym. Sci. A Polym. Chem.

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Polymerization of o‐methylaniline or o‐toluidine (OT) was studied in aqueous acidic (HCl) medium with or without the use of the support of a water soluble polymer, polyacrylamide (PAAm). Poly(o‐ toluidine) (POT) produced with PAAm support was in the form of aqueous solution or dispersion that showed high stability and good processibility. High degree of dispersion or near solubility and storage stability of POT thus prepared are explained on the basis of establishment of hydrogen bonding between segments of POT being formed and the PAAm present in the medium thus resulting in a template effect. Studies by UV‐visible spectroscopy and FTIR spectroscopy lend support to this view. POT‐PAAm composites commonly show higher thermal stability than POT and the composites show DC‐electrical conductivities in the range of 10−9–10−1 S · cm−1 depending on the POT content. Morphological analysis of the optically clear aqueous POT‐PAAm solution by transmission electron microscopy (TEM) shows the presence of large clusters of PAAm‐supported near‐spherical POT nanoparticles in the aqueous PAAm solution. Scanning electron microscopic (SEM) analysis of isolated POT‐PAAm composites shows a cocontinuous phase morphology without any trend of gross phase separation. © 1999 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 37: 3243–3256, 1999

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Characterization of poly(vinyl pyrrolidone) modified polyaniline prepared in stable aqueous medium

Cited by 158 publications

References 21 publications

Benzoyl peroxide as a novel oxidizing agent in a polyaniline dispersion: Synthesis and characterization of a pure polyaniline–poly(vinyl pyrrolidone) composite

Benzoyl peroxide as a novel oxidizing agent in a polyaniline dispersion: Synthesis and characterization of a pure polyaniline–poly(vinyl pyrrolidone) composite

Preparation and properties of cyanate ester modified by epoxy resin and phenolic resin

Studies on stable aqueous poly(o-toluidine) prepared with the use of a water soluble support polymer, polyacrylamide

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