Permeability of polymers in protective organic coatings

Sangaj, Nivedita; Malshe, V. C.

doi:10.1016/j.porgcoat.2003.09.015

Cited by 231 publications

(118 citation statements)

References 12 publications

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“…50 This higher permeability can be attributed to the monomer composition, which includes more hydrophilic acrylic monomers that increases the water sorption. Our P values for the waterborne polymers are slightly higher than what was reported by Kim et al 9 for the permeability of water vapor in 2-ethyl hexyl acrylate copolymer latex films but of the same order of magnitude (equivalent to …”

Section: Permeability Of Water In Waterborne Polymer Coatingsmentioning

confidence: 99%

Water Vapor Sorption and Diffusion in Secondary Dispersion Barrier Coatings: A Critical Comparison with Emulsion Polymers

Liu

Soer

Scheerder

et al. 2015

ACS Appl. Mater. Interfaces

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The conventional method to synthesize waterborne polymer colloids is emulsion polymerization using surfactants. An emerging method is the use of secondary dispersions (SD) of polymers in water, which avoids the addition of any surfactant. Although there are numerous studies of the water barrier properties (sorption, diffusion and permeability) of waterborne emulsion (Em) polymer coatings, the properties of SD coatings, in comparison, have not been thoroughly investigated. Here, dynamic water vapor sorption analysis is used to compare the equilibrium sorption isotherms of the two forms of styrene-acrylate copolymers (Em and SD) with the same monomer composition. From an analysis of the kinetics of vapor sorption, the diffusion coefficient of water in the polymer coatings is determined. The combined effects of particle boundaries and surfactant addition were investigated through comparison of the properties of SD and Em coatings to those of (1) solvent-cast polymer coatings (of the same monomer composition), (2) Em polymers after dialysis to remove partially the water-soluble species, and (3) SD polymers with added surfactants. The results reveal that particle boundaries Materials and Interfaces (2015) 7, pp 12147-12157 2 and surfactants both increase vapor sorption. The diffusion coefficients of water are comparable in magnitude in all of the polymer systems but are inversely related to water activity because of molecular clustering. Compared to all of the other waterborne polymer systems, the SD barrier coatings show the lowest equilibrium vapor sorption and permeability coefficient at high relative humidities and also the lowest water diffusion coefficient at low humidities. These barrier properties make SD coatings an attractive alternative to conventional emulsion polymer coatings. Published in ACS Applied

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Section: Permeability Of Water In Waterborne Polymer Coatingsmentioning

confidence: 99%

Water Vapor Sorption and Diffusion in Secondary Dispersion Barrier Coatings: A Critical Comparison with Emulsion Polymers

Liu

Soer

Scheerder

et al. 2015

ACS Appl. Mater. Interfaces

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“…bariérový efekt [1][2][3]. Jelikož je koroze kovu za normálních teplot elektrochemickým procesem, k jejímu průběhu je nutné, aby elektrolyt a oxidující látky byly přítomné na rozhraní mezi kovem a povlakem [2].…”

Section: Ochranné Působení Organických Povlakůunclassified

“…Původně se předpokládalo, že povlaky fungují jako bariéra přístupu vody a kyslíku k povrchu kovu [3]. Již během 50. až 70. let 20. století však bylo laboratorními experimenty opakovaně prokázáno, že transport vody i kyslíku strukturou běžných organických povlaků je dostatečně rychlý a není limitním faktorem určujícím korozní rychlost podkladového kovu [4,5].…”

Section: An Overview Of Protection Mechanisms Of Organic Coatings Forunclassified

Mechanisms of degradation of organic coatings

Prošek

2017

Koroze a Ochrana Materialu

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ÚVODOrganické povlaky, případně organické povlaky kombinované s kovovými povlaky (tzv. duplexní systémy), jsou nejrozšířenějším a často nejefektivnějším způsobem protikorozní ochrany kovových zařízení a vý-robků. Dle předpokládané korozivity prostředí se aplikují v tloušťkách v řádu od jednotek do stovek mikrometrů. Robustní nátěrové systémy zahrnují několik vrstev povlaků s různými vlastnostmi, které jsou schopny efektivně chránit kovové konstrukce po dobu minimálně 20 let i v nejtěžších podmínkách těžby ropy na otevře-ném moři. Duplexní systémy pro střešní krytiny s povlakem na bázi zinku (10-25 µm), konverzním povlakem, základním nátěrem (5-10 µm) a vrchním nátěrem (20-25 µm) jsou v našich podmínkách schopné poskytnout životnost kolem 50 let. Ochranné působení organických povlakůPrimární funkcí organického povlaku je tvorba fyzické překážky mezi prostředím a chráněným kovem, tzv. bariérový efekt [1][2][3]. Jelikož je koroze kovu za normálních teplot elektrochemickým procesem, k jejímu průběhu je nutné, aby elektrolyt a oxidující látky byly přítomné na rozhraní mezi kovem a povlakem [2]. Organický povlak bude funkční tehdy, pokud význam-ně omezí přístup vody, kyslíku nebo iontů k povrchu Obr. 1. Schématické znázornění procesů potenciálně důle-žitých pro korozní stabilitu organickým povlakem chráněné-ho kovu na příkladu zinku v roztoku NaCl; transport vody (1) a kyslíku (2) k rozhraní, iontů mezi anodickými místy a elektrolytem (3a, 3b), iontů mezi katodickými místy a elektrolytem (4a, 4b), elektronová vodivost kovu (5), přenos iontů v roztoku (6) Fig. 1

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“…Owing to their properties, conductive polymers induce passivation processes on steel surfaces, in which respect they are similar to the compounds containing heavy metals. This shows promise are regards the feasibility of using conductive polymers to replace, or reduce the use of, e.g., chromate-based corrosion inhibitors [10]. They may also fi nd application as electrochemical, or electrically active, pigments to attain passivation of the surface of a corroding steel substrate [11,12].…”

Section: Introductionmentioning

confidence: 99%

The anticorrosion properties of pigments based on molybdates and tungstates surface-modified with conducting polymers

Hájková

Kalendová

2017

Koroze a Ochrana Materialu

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The objective of this work was to examine the properties of molybdate or tungstate based pigments whose surface has been coated with a conductive polymer, viz. either polyaniline phosphate (PANI) or polypyrrole phosphate (PPY), if used as pigments in organic coating materials. The anticorrosion pigments were prepared by high-temperature solid-state synthesis from the respective oxides, carbonates. The composite pigments (pigment/conductive polymer) were dispersed in a solvent-type epoxy-ester resin binder to obtain a series of paints whose anticorrosion properties were assessed by means of corrosion tests in accelerated corrosion test and by the linear polarisation method. Focus was on the anticorrosion properties of the paints depending on the pigment surface treatment, initial pigment composition, and pigment volume concentration (PVC) in the paint. The surface-treated pigment particles were expected to have a favourable effect on the anticorrosion and the mechanical properties of epoxy-ester resin based paints.

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Permeability of polymers in protective organic coatings

Cited by 231 publications

References 12 publications

Water Vapor Sorption and Diffusion in Secondary Dispersion Barrier Coatings: A Critical Comparison with Emulsion Polymers

Water Vapor Sorption and Diffusion in Secondary Dispersion Barrier Coatings: A Critical Comparison with Emulsion Polymers

Mechanisms of degradation of organic coatings

The anticorrosion properties of pigments based on molybdates and tungstates surface-modified with conducting polymers

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