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Durability properties chemical resistance

Cadmium stannate, used as electrodes in photogalvanic cells, is another example of a transparent conductor oxide (TCO) having desirable properties, such as good durability and chemical resistance. It can be produced by the spray pyrolysis CVD method with organic solutions of CdCH and SnCH or [Cd(hfa)2 (TMEDA)] and [Sn(acac)2]. ° It also shows the unexpected effect of improving transparency with increasing Him conductivity higher than tin-doped indium oxide. [Pg.290]

Special properties chemical resistance, durability, esthetics, free-flowing, narrow particle size distribution, weather resistance ... [Pg.11]

PROPERTIES OF SPECIAL INTEREST Weathering resistance, antisoiling properties, chemical resistance, UV resistance, and durability. [Pg.940]

Practically, membranes should have a high permeate flux, high contanunant rejection, great durability, good chemical resistance and low cost (Zhou Smith, 2002). The other property that is also important in the selection and/or classification of a membrane process is pore size or molecular weight cutoff (MWCO) (Zhou Smith, 2002). The MWCO expresses the retention characteristics of the membrane in terms of molecules of known sizes (Brock, 1983) and defines the maximum molecular weight of a solute to be rejected (Zhou Smith, 2002). [Pg.433]

These high performance polymers not only meet unusual requirements for long term durability at elevated temperatures, they may also have unique and diverse characteristics such as conductivity, insulating properties, chemical resistance, self extinquishing, selective gas barrier properties and are also used in normal applications as films, fibers, elastomers, adhesives, and coatings as well as injection moldable materials of construction. [Pg.3]

PE is cheap, flexible, durable, and chemically resistant. LDPE is used to make films and packaging materials, including plastic bags, while HDPE is used more often to make containers and plumbing and automotive fittings. HDPE s higher stiffness compared with LDPE and LLDPE allows film manufacturers to use it as a substitute to reduce thickness while keeping film properties constant. [Pg.5]

The polymer and its copolymers are mainly exploited for their barrier properties, both as film and coating materials. The major use for homopolymer and vinyl chloride copolymer is a surface coating for PETP bottles, to enhance their oxygen barrier properties, when the bottle is to be filled with a carbonated alcoholic beverage alcohol may be oxidized to acetaldehyde, which taints the flavour of the drink. The outer surface of the bottle is dip-coated in polymer as a latex, and dried at about 60°C (i.e. below the Tg of PETP), to form a bonded, coherent film on its surface. The biaxially oriented film has excellent mechanical and optical properties. The copolymer is also made into fibres which have excellent mechanical properties, durability and chemical resistance (they are used in deck-chair fabrics for example). [Pg.134]

Acrylic resins are particularly popular as partners with isocyanates for several reasons. The obvious alternatives are polyesters and alkyds. It is quite possible to formulate a paint with an alkyd or polyester resin in combination with an isocyanate which will have comparable film properties - durability, toughness, chemical resistance, but the predominant choice in the industrial market is acrylic. [Pg.315]

Polyethers and polysulfides obtained by displacement reaction, in general, are rigid as well as flexible, heat resistant, tough, and melt processable polymers with good electrical, chemical, and durability properties, as well as fire and hydrolysis resistance [195,196]. [Pg.50]

The phase structure of glasses has a significant effect on their physical properties, which is discussed below with reference to chemical durability. The magnitude of the phase separation can be altered by heat treatment, and enhanced or reduced by the addition of various oxides to the melt. In particular, the addition of alumina to commercial soda-lime-silica glasses reduces the tendency to phase separation, improving chemical resistance (Doremus, 1973). A detailed study of the microstructure of soda-lime-silica glasses has been published by Burnett and Douglas (1970). The control of phase separation in the melt is now commercially important for processes such as the... [Pg.155]

Rapra have published their own chemical resistance data sheets [9, 10], based on results of tests at Rapra performed by a small team of operators. They are thus comparable one with another and their sources are known. Rapra s Plascams materials selection database provides durability properties on a ranking basis and their Plastics Design Guide includes Plascams and other useful programmes. In 2002 Rapra and Faraday Plastics have launched a new website of environmental stress cracking data (www.esc-plastics.com). [Pg.147]

Chemical Properties. The chemical durability is a function of the durability of the crystals and the residual glass. Generally, highly siliceous glass-ceramics with low alkali residual glasses, such as glass-ceramics based on quartz and (3-spodumene, have excellent chemical durability and corrosion resistance similar to that obtained in borosilicate glasses. [Pg.320]

Vinyl lacquers are used mainly where a high degree of chemical resistance is required these lacquers are based on vinyl chlorides and vinyl acetates. Acrylic lacquers are based on methyl methacrylate and methyl acrylate polymers and copolymers. Other esters of acrylic and methacrylic acid also may be used to make nonconvertible film formers. Judicious selection of these acrylic acid or methacrylic acid esters allows one to produce film formers with specifically designed properties such as hardness, flexibility, gloss, durability, heat, and chemical resistance. Acrylic lacquers, however, are not noted for their water resistance. The principal uses of acrylic-type lacquers are fluorescent and metallic paints, car refinish applications, clear lacquers and sealers for metals, and protective coatings for aircraft components and for vacuum-deposited metals, as well as uses in pigmented coatings for cabinets and appliances. [Pg.1309]

These pigments combine excellent tinctorial properties with outstanding durability, solvent fastness, lightfastness, heat fastness, and chemical resistance. Table 8.1 lists those shades currently available commercially. [Pg.108]

In terms of fastness properties, complex inorganic colored pigments are unequaled. Their high calcination temperatures during manufacture impart thermal stabilities up to 1000°C, outstanding outdoor durability, and outstanding chemical resistance. [Pg.131]

In practice, durability refers to how well the formulation holds up to environmental stresses. The properties of interest are the formulation s heat stability toward processing temperatures, its fade and weather resistance, its resistance toward migration into various solvents, and its chemical resistance toward alkali, acid, and bleach (strong oxidizing agents). [Pg.321]

Concrete Coatings. The durability, weatherability, and chemical resistance of composites match up well with the required properties of protective coatings for concrete and other rigid materials. A typical application is the protection of concrete structures from the acid solutions used in metal ore leaching plants (9). In one such application, sulfur composite was applied to two leaching vats of a new experimental copper ore leaching facility (Figure 8). [Pg.231]

Aromatic monomers have very good chemical resistance but do not have the external durability characteristics of aliphatic monomers. Ahphatic monomers will have better non-yellowing properties. [Pg.182]

Cellulose ethers generally are very stable. Many etherified cottons are highly resistant to hydrolytic removal of substituent groups under both acidic and alkaline conditions. Because of this stability, many of the most practical chemical treatments of cotton are based on etherification reactions [9,328-331]. These treatments provide cotton products with useful, durable properties including wrinkle resistance, water repellency, flame resistance, and antimicrobial action. [Pg.86]


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See also in sourсe #XX -- [ Pg.332 ]




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