Poly anticorrosives

SFE has been used extensively in the analysis of solid polymers. Supercritical fluid extraction of liquid samples is undertaken less widely because dissolution or entrainment of the matrix can occur. As illustrated elsewhere SFE has also been applied for the analysis of liquid poly(alkylene glycol) (PAG) lubricants and sorbitan ester formulations [370]. The analysis of PAG additives (antioxidants, biocides and anticorrosion, antiwear and antifoaming agents) is hindered by the presence of the low molecular weight PAG matrix (liquid) and therefore a method for the selective separation of additives from PAG is required. The PAG... 

Anticorrosive pigment Air- drying alkyd primers Alkyd- melamine primers 2-Compo- nent epoxy primers 2-Compo-nent acrylic isocyanate primers Chlor- inated rubber primer Aqueous polymer dispersions Poly(vinyl- butyral) primers Electro- deposition coatings Mirror coatings References... 

Polyaniline has been grafted onto the poly(styrenesulfonic acid-co-aminostyrene) backbone using aniline, ammonium persulfate, and hydrochloric acid. The graft copolymer is water soluble and self-doping and can be used in electrical and marine anticorrosive applications. 

Brominated styrene grafted onto PET is capable of acting as a nonvolatile FR for PET fabrics [328]. Polyphosphate esters can be used as flame retardant plasticizers [204], phosphorus containing moieties act as color improvers and thermostabilizers in polyesters [198, 205]. Antistatic properties of copolymers containing moieties with sulfonic acids have been reported [107]. Some polymers, like poly(JV-vinylimidazole) impart anticorrosive and antirusting properties to protective coatings of metals [329]. 

Coating is one of the important uses of fluoropolymers, since it enables them to exhibit their characteristics on the surface of a substrate. Some of the conventional fluoropolymers such as polytetrafluoroethylene [9002-84-0] (PTFE), tetrafluo-roethylene-hexafluoropropylene copolymer [25067-11-2] (FEP), and ethylene-tetrafiuoroethylene copolymer [25038-71-5] (ETFE) have been used as antistick or anticorrosive coatings. Only poly(vinylidene fluoride) [9002-58-1] (PVDF) has so far been used in paints. The major difficulties in employing thermoplastic fluoropolymers in paints and coatings result from their poor solubility in organic solvents and... 

F. Liesa, C. Ocampo, C. Aleman, E. Armelin, R. Oliver, and F. Estrany, Application of electrochemically produced and oxidized Poly(3,4ethylenedioxythiophene) as anticorrosive additive for paints influence of the doping Level, J. Appl Polym. Set, 102, 1592-1599 (2006). 

Synonyms Dimethyidiphenyl siloxanes and silicones Diphenylsiloxane-dimethylsiloxane copolymer Poly (dlmethylsiloxane-co-diphenylsilox-ane) Siloxanes and silicones, dimethyl, diphenyl Uses Binder for high temp, anticorrosion paints resist, to 650 C, for use in industrial equip., chimneys, exhaust tubes heat transfer fluid dielec, coolant... 

PPy has also been used in combination with CNTs to obtain an anticorrosion coating. Hermas [69] studied PPy-CNTs coating applied on stainless steel by in situ EP of PPy-oxidised multi-walled carbon nanotubes (MWCNTs) and PPy-oxidised SWCNTs composites from 0.1 M oxalic acid by using cyclic voltammetry. The results show that the addition of the oxidised carbon nanotubes greatly enhances the EP process, especially in the case of oxidised SWCNTs. Similar results are reported in Ref. [70], referring to electrodeposition of a nanocomposite coating made of oxidised CNTs and poly(o-phenylenediamine) (PoPD) on a stainless steel. Also in this case the presence of the CNTs enhances the deposition of the PoPD and this enhancement is more evident with SWCNT than with MWCNTs. The nanocomposite coating keeps the stainless steel in a passive state in an acidic solution. 

PANI/P-PVA (partially phosphorylated poly(vinyl alcohol)) nanoparticles were successfully dispersed in epoxy resin applied to steel [82]. P-PVA is fundamental to obtain a uniform dispersion of PANI nanoparticles, and this fact is responsible for the uniform formation of Fe Oj passive layer at the interface between coating and substrate and therefore for its effectiveness in corrosion protection. PANI was also used in combination with DBSA to be added to epoxy-ester (EPE) system to form a smart anticorrosion coating [73]. DBSA is used as both surfactant and doping agent. By EIS measurements it is deduced that the better anticorrosion performance of PANI (DBSA)/EPE coatings with respect to simple EPE is due to the formation of a second barrier layer by reaction between released DBSA anions and Fe cations at the defective locations of the coating. 

An extensive study on anticorrosion properties of PANI, PPy and PEDOT used as additives was reported in [88]. Results indicate that the protection against corrosion imparted by the formulations modified by the addition of poly(3,4-ethylenedioxythiophene) doped with poly(styrene sulphonate), PANI-ES and, especially, PANI-EB is significantly higher than that of the unmodified epoxy paint. Thus, results evidence that some CP compositions can inhibit the steel corrosion and, therefore, small concentrations of these materials would be used to replace conventional inorganic corrosion inhibitors currently used in primer paints. In Table 10.6, some examples of the... 

Poly(isobutylene) only crystallizes under stress. Because of the low glass transition temperature (-70 C), its lack of crystallinity, and the somewhat weak intermolecular forces, poly (isobutylene) is an elastomer. The low-molar-mass material is used as an adhesive or viscosity improver. The higher-molar-mass products are employed as rubber additives or for very airtight tubes. The cold flow (creep) can be diminished or eliminated by the addition of polyethylene. Poly(isobutylenes) modified by copolymerization are used as protective sheeting for building sites and as anticorrosive coverings (e.g., a copolymer of 90% isobutylene and 10% styrene). 

Modification by the incorporation of metals or metalloids, styrene, vinyl acetate, poly(styrene-co-maleic anhydride), urethane linkages, and so on result in poly(ester amide) resins with good chemical properties and excellent thermal resistance. Some can also be used as effective antibacterial and biologically safe corrosion protective coating materials. Urethane-modified ethylenediamine tetraacetic add the fatty amide diol of linseed oil-based poly(ester amide) resin exhibits excellent physicomechanical properties, high thermostability up to 200°C and anticorrosive properties. ... 

M. Alam, A. R. Ray and S. Ahmad, Synthesis and characterization of poly(ester amide urethane) from linseed oil as anticorrosive coatings , J Appl Polym Sci, 2009,114, 3268-73. 

F. Zafar, E. Sharmin, S. M. Ashraf and S. Ahmad, Studies on poly(styrene-co-maleic anhydride)-modified polyesteramide-based anticorrosive coatings synthesized from a sustainable resource ,/App/ Polym Sd, 2004,92,2538-44. 

Conductive polymer nanocomposites may also be used in different electrical applications such as the electrodes of batteries or display devices. Linseed oil-based poly(urethane amide)/nanostuctured poly(l-naphthylamine) nanocomposites can be used as antistatic and anticorrosive protective coating materials. Castor oil modified polyurethane/ nanohydroxyapatite nanocomposites have the potential for use in biomedical implants and tissue engineering. Mesua ferrea and sunflower seed oil-based HBPU/silver nanocomposites have been found suitable for use as antibacterial catheters, although more thorough work remains to be done in this field. ° Sunflower oil modified HBPU/silver nanocomposites also have considerable potential as heterogeneous catalysts for the reduction of nitro-compounds to amino compounds. Castor oil-based polyurethane/ epoxy/clay nanocomposites can be used as lubricants to reduce friction and wear. HBPU of castor oil and MWCNT nanocomposites possesses good shape memory properties and therefore could be used in smart materials. ... 

Finally, to conclude, it is also important to point out that phosphorus-based poly(meth)acrylates are successfully employed for many applications, including flame retardancy, anticorrosion, and in the biomedical field. As these applications are of great interest, we can assume that the development of other phosphorus-based (meth)acrylate monomers will continue in the future. 

David et al have tested these new diblock copolymers as additives for adhesion/anticorrosive properties of metals. In order to protect against corrosion, a coating system was prepared consisting of a blend of poly(VDF) (inhibiting water penetration) with poly(MMA)-Z)-poly(monophosphonic acrylate) diblock copolymer with 10 wt% [compared to poly(VDF)]. This diblock copolymer was obtained by atom transfer radical polymerization using post-functionalization and hydrolysis to introduce the phosphonic acid function onto the polymeric backbone. The anticorrosive properties of virgin poly(VDF) were also determined without any additive to be compared... 

Figure 10.1 shows an almost linear trend for the evolution of corrosion as a function of time when the diblock copolymer is used as additive. As expected, virgin poly(VDF) alone is not able to prevent the metal from corrosion as the surface is almost completely corroded after only 48 h. Figure 10.1 also shows a high improvement when poly(VDF) is blended with poly(MMA)-b-poly(phosphonate methacrylate) diblock copolymer additive, although the statistical copolymer seems to afford better adhesion towards the metallic surface and hence better anticorrosion properties. 

Common matrix resins for blending with conducting polymers are widely used in traditional anticorrosion coatings, such as epoxy resin [25, 27, 32, 34, 68, 70, 71, 76], polyacrylic-based resin [24, 39, 48, 77, 78], and poly(methyl methacrylate) [30, 60, 62, 64]. The feature of matrix resin as well as the amount of ICPs is important to the anticorrosion performance of conductive composite coating. Samui and Phad-nis [67] blended various amounts of dioctyl phosphate (DOPH)-doped PANI with different polymeric matrices (epoxy resin, polyurethane resin, styrene-butyl acrylate... 

The results were positive and promising. Bagherzadeh et al. [81] found that the anticorrosion performance of a two-component water-based epoxy resin coating system was improved by adding only 0.02 wt% nano-PANI. Ahmad et al. [82] investigated the corrosion protection behavior of waterborne resorcinol formaldehyde (RF)-cured composite coatings of poly(l-naphthylamine) (PNA)/poly(vinyl alcohol) (PVA) on mild steel, and even superior corrosion protective performance was observed in different corrosive media when compared with the reported solvent-based conductive polymer coatings. 

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