Cationic Polyacrylamide Adsorption on Epoxy Surfaces

Angelopoulos, Anastasios P.; Benziger, J.; Wesson, Sheldon P.

doi:10.1006/jcis.1996.4573

Cited by 23 publications

(55 citation statements)

References 4 publications

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“…Scanning electron microscopy (SEM) revealed that all the substrate surfaces were smooth at a resolution limit of 50 nm. (By contrast, industrial surfaces typically subjected to metallization have a roughness of about 1 m.) Contact angle titrations (3,8) of these substrates determined that ionization was negligible at the acidic pH of the polyelectrolyte solution.…”

Section: Iia Materialsmentioning

confidence: 95%

“…An expression comparable to Eq. [6] has been previously employed to extract the degree of dissociation of ionizable surface groups as a function of the pH of the wetting liquid in the advancing wetting mode (3,8).…”

Section: Iib Methodsmentioning

confidence: 99%

“…The retractable stage was moved at a velocity of 0.2 mm/min for all experiments reported here. A work of adhesion for each probe liquid was extracted from a force balance on the sample as previously described (3). Three probe liquids were employed: de-ionized water (pH 5.6), ethylene glycol (Aldrich Chemical Co.), and diiodomethane (Aldrich Chemical Co.).…”

Section: Iib Methodsmentioning

confidence: 99%

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The Effect of Polymer Substrate Surface Basicity on the Adsorption of a Cationic Polyacrylamide

Angelopoulos

Matienzo²,

Benziger³

1999

Journal of Colloid and Interface Science

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Section: Iia Materialsmentioning

confidence: 95%

Section: Iib Methodsmentioning

confidence: 99%

Section: Iib Methodsmentioning

confidence: 99%

See 1 more Smart Citation

The Effect of Polymer Substrate Surface Basicity on the Adsorption of a Cationic Polyacrylamide

Angelopoulos

Matienzo²,

Benziger³

1999

Journal of Colloid and Interface Science

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“…Long-term adhesion behavior of this polyelectrolyte is of concern due to hydrolysis of acrylamide to carboxylic acid under humidified conditions. [18] A similar class of materials has exhibited excellent durability in microelectronics applications. [10] The impact of acrylamide hydrolysis will be closely monitored by ex situ durability testing of multilayer coatings as described in Section 2.6.…”

Section: Impact Of Ph On Cationic Bindermentioning

confidence: 99%

“…We have also previously demonstrated that as many as 10% of the acrylamide groups on this polymer have been previously hydrolyzed to carboxylic acids during synthesis, providing additional opportunities for polar and hydrogen bonding interaction between the adsorbed layers. [18] The dissociation behavior of hydrolyzed groups on the cationic polyacrylamide has been described by the following best fit to the expanded Henderson-Hasselbalch equation [18] :…”

Section: Impact Of Ph On Cationic Bindermentioning

confidence: 99%

Electrically Conductive Thin Films Prepared from Layer‐by‐Layer Assembly of Graphite Platelets

Alazemi

Dutta

Wang

et al. 2009

Adv Funct Materials

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Layer‐by‐layer (LBL) assembly of carbon nanoparticles for low electrical contact resistance thin film applications is demonstrated. The nanoparticles consist of irregularly shaped graphite platelets, with acrylamide/ββ‐methacryl‐oxyethyl‐trimethyl‐ammonium copolymer as the cationic binder. Nanoparticle zeta (ζζ) potential and thereby electrostatic interactions are varied by altering the pH of graphite suspension as well as that of the binder suspension. Film thickness as a function of zeta potential, immersion time, and the number of layers deposited is obtained using Monte Carlo simulation of the energy dispersive spectroscopy measurements. Multilayer film surface morphology is visualized via field‐emission scanning electron microscopy and atomic‐force microscopy. Thin film electrical properties are characterized using electrical contact resistance measurements. Graphite nanoparticles are found to self‐assemble onto gold substrates through two distinct yet overlapping mechanisms. The first mechanism is characterized by logarithmic carbon uptake with respect to the number of deposition cycles and slow clustering of nanoparticles on the gold surface. The second mechanism results from more rapid LBL nanoparticle assembly and is characterized by linear weight uptake with respect to the number of deposition cycles and a constant bilayer thickness of 15 to 21 nm. Thin‐film electrical contact resistance is found to be proportional to the thickness after equilibration of the bilayer structure. Measured values range from 1.6 mΩ cm−2 at 173 nm to 3.5 mΩ cm−2 at 276 nm. Coating volume resistivity is reduced when electrostatic interactions are enhanced during LBL assembly.

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Angle resolved XPS characterization of cationic polyacrylamides

Zekonyte

Williams

Beamson

et al. 2009

Surface & Interface Analysis

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In many applications surfaces are modified using polymer films and the polymers used are often complex copolymers. In biomedical applications it is critical to determine the surface properties of a substrate as it is these that mediate the cellular interactions. The surface structure of copolymer films can only rarely be established from their bulk composition alone. In this study angle resolved XPS was used to build a model of the structure of copolymer films produced on glass substrates from a family of poly(acrylamide) copolymers containing cationic blocks. The thickness of the copolymer films was demonstrated to be dependent on the concentration of the polymer solution and the ratio of non-cationic to cationic blocks in the copolymer. The data demonstrated that the cationic blocks of the copolymer preferentially segregated to the glass surface and the non-cationic poly(acrylamide) blocks preferentially segregated to the air-vacuum interface. A low concentration of the cationic functional groups was present throughout the poly(acrylamide) layer and it was suggested that this resulted from a small fraction of the cationic blocks being pulled into the poly(acrylamide) layer at points along the polymer chain where the two blocks are connected. Evidence of a thin surface hydrocarbon contamination layer was also observed.

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Cationic Polyacrylamide Adsorption on Epoxy Surfaces

Cited by 23 publications

References 4 publications

The Effect of Polymer Substrate Surface Basicity on the Adsorption of a Cationic Polyacrylamide

The Effect of Polymer Substrate Surface Basicity on the Adsorption of a Cationic Polyacrylamide

Electrically Conductive Thin Films Prepared from Layer‐by‐Layer Assembly of Graphite Platelets

Angle resolved XPS characterization of cationic polyacrylamides

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