The molecular weight of polyaniline by light scattering and gel permeation chromatography

Hsu, Chien‐Ning; Peacock, Patricia M.; Flippen, R. B.; Manohar, Sanjeev K.; MacDiarmid, Alan G.

doi:10.1016/0379-6779(93)91285-a

Cited by 45 publications

(21 citation statements)

References 10 publications

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“…The supernatant was removed and added to 2 mL of acetonitrile, and MTBE was removed in vacuo at room temperature and p = 70 mbar. The products were reduced by adding 400 μL of H 4 N 2 24 and stirring vigorously for 10 min. Finally, 8 mL of a 10 mM NH 4 HCO 3 buffer, adjusted with NH 3 solution to pH 10, was added.…”

Section: Methodsmentioning

confidence: 99%

How Anionic Vesicles Steer the Oligomerization of Enzymatically Oxidized p-Aminodiphenylamine (PADPA) toward a Polyaniline Emeraldine Salt (PANI-ES)-Type Product

et al. 2016

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The oxidation of the aniline dimer, p-aminodiphenylamine (PADPA), with Trametes versicolor laccase and O2 in an aqueous solution of pH 3.5 is controlled by negatively charged AOT (sodium bis(2-ethylhexyl) sulfosuccinate) vesicles. With vesicles, a product resembling polyaniline in its emeraldine salt form (PANI-ES) is obtained, in contrast to the reaction without vesicles where no such product is formed. To understand this observation, the product distribution and structures from the reaction with and without vesicles were determined by using partially selectively deuterated PADPA as a starting material and analyzing the products with HPLC-MS. We found that in the presence of vesicles the main product is obtained in about 50% yield, which is the N-C-para-coupled PADPA dimer that has spectroscopic properties of PANI-ES, as determined by time-dependent density functional theory (TD-DFT) calculations. A secondary reaction route leads to longer PADPA oligomers that must contain a phenazine core. Without vesicles, PADPA and its products undergo partial hydrolysis, but in the presence of vesicles, hydrolysis does not occur. Because molecular dynamics (MD) simulations show that the main intermediate oxidation product is embedded within the vesicle membrane, where the water content is very low, we propose that the microenvironment of the vesicle membrane protects the oxidation products from unwanted hydrolysis.

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Section: Methodsmentioning

confidence: 99%

How Anionic Vesicles Steer the Oligomerization of Enzymatically Oxidized p-Aminodiphenylamine (PADPA) toward a Polyaniline Emeraldine Salt (PANI-ES)-Type Product

et al. 2016

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“…Molecular weight can thus be calculated based on the relationship between scattered light intensities and solution concentrations. 49,50 Cross-sectional morphologies and surface images were taken using a JEOL JSM-6701F scanning electron microscope. Unsupported membrane samples were used for cross-sectional imaging.…”

Section: Characterizationmentioning

confidence: 99%

Novel chlorine resistant low-fouling ultrafiltration membrane based on a hydrophilic polyaniline derivative

et al. 2015

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“…Further attempts to obtain molecular weight data for PANI have focused on the colorless leucoemeraldine form that may be synthesized directly or reduced in situ. 10 Comparison of those results with GPC suggested that chain scission due to the hydrazine used for reduction could be a limitation for this approach. Gettinger and Heeger 11 reported static light scattering data on EB-PANI with camphorsulfonic acid in m-cresol.…”

Section: Introductionmentioning

confidence: 99%

Anomalous Dynamic Light Scattering from Solutions of Light Absorbing Polymers

Sehgal

Seery

1999

Macromolecules

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Dynamic light scattering data from highly absorbing solutions exhibit intensity-intensity correlation functions characterized by a sum of exponential decays superposed with an oscillatory term. A new analytical treatment is proposed, which explains this behavior as arising from the heterodyning of scattered light from two distinct species in convective motion. Similar data were obtained both for solutions of polyaniline (PANI) as well as for a complex of cytochrome c and cytochrome c peroxidase in phosphate buffer. This suggests the generality of the phenomenon for polymers that both absorb light and aggregate, such as proteins and conducting polymers. Effects of laser power on convection, thermal lensing, and coning of the beam and concentration of absorbing species have been considered. The presence or absence of the oscillations is shown to be a sensitive indication of aggregation.

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The molecular weight of polyaniline by light scattering and gel permeation chromatography

Cited by 45 publications

References 10 publications

How Anionic Vesicles Steer the Oligomerization of Enzymatically Oxidized p-Aminodiphenylamine (PADPA) toward a Polyaniline Emeraldine Salt (PANI-ES)-Type Product

How Anionic Vesicles Steer the Oligomerization of Enzymatically Oxidized p-Aminodiphenylamine (PADPA) toward a Polyaniline Emeraldine Salt (PANI-ES)-Type Product

Novel chlorine resistant low-fouling ultrafiltration membrane based on a hydrophilic polyaniline derivative

Anomalous Dynamic Light Scattering from Solutions of Light Absorbing Polymers

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