Durability properties

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]. 

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). 

Ides operates the Prospector materials database with a search facility covering 38,000 plastic products from 400 global manufacturers (www.ides.com). Among the durability properties listed are creep and fatigue. 

Poiymers which are 100% acrylic are known for their outstanding exterior durability properties, as well as excellent alkali resistance and overall high performance. Styrene is generally lower-cost than many other monomers, so styrene-acrylics are lower in cost than all acrylics but have poorer exterior durability because styrene is a UV absorber and degrades. Styrene-acrylics, do, however, generally have very good water-resistance properties due to their hydrophobicity. Styrene acrylics are popular in some areas of Europe, Asia, and Latin America. Vinyl acetate is also somewhat lower in cost, so these polymers are popular for interior paints, particularly in the United States, where exterior durability and alkali resistance are not performance issues. 

TABLE 2. Light Emission and Durability Properties of Selected Organoiridium Light-Emitting Elements... 

Stability of the emulsion is of prime importance. If the emulsion breaks, the advantages of adding sulphur are completely lost, with the impact on strength and durability properties particularly detrimental. As sulphur in asphalt emulsions are unstable by nature, due attention has to be paid to this point. 

Preliminary testing has shown these blocks to have strength and durability properties equal to or better than portland cement block standards. The viability of the process has been demonstrated on a small scale and mix designs and process conditions have been optimized. Ongoing work will involve scaled-up production along with extensive product testing. 

By far the greatest market for this pigment, especially the rosinated grade, is in the printing ink market, where red lake C is known as a warm red, due to its distinct yellow shade. Within the plastics industry red lake C offers an economical azo red that finds use in LDPE and polyurethane where the end use allows such a pigment with relatively poor durability properties to be used as the system colorant. 

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. 

An extremely soft, hydrophilic, acrylic latex with outstanding durability properties, for use with CALIBAN F/R P-44, P-53, P-66. 

The results of isothermal tests, effected at 400 °C and S.V.=30000 h at the engine exhaust, are presented in Figure 3 in terms of NOx conversions versus time on stream. A positive effect of copper loading on durability properties was observed for both zeolites. In particular, while the initial activity was totally depressed on Z(80)70 and Z(80)221 after about 3 and 12 h, respectively, the deactivation rate of the sample Z(80)536 resulted much lower with respect to the other two catalysts. Similar trend was presented by Z(25)67 and Z(25)166, the last sample resulting the most stable between those considered. 

Press Time. Properties of the Mondur MR-bound boards pressed only 3 minutes vs. those of the control boards are given in Table XI. The internal bond strength of the Mondur MR boards did drop, as expected, although even at 3 minutes press time at 325 F (l63°C), it is higher than that of the phenolic-bound board cured 7 minutes at 375 F (191 C). The surprise comes in the bending strength and durability properties where the performance actually appears better at the shorter press time. 

The equation of regression for three component composite materials based on sevilen, PA, PU, Lentex, PVS were received that let us to forecast the durability properties of PCM and finally properties of industrial articles. 

Resistance and Durability Properties Development of Thermoplastic Acrylic Coatings Development of Thermosetting Acrylic Coatings Recent Trends in Acrylic Coatings... 

Aqueous thermosetting emulsions Good resistance/ durability properties Film thickness limitations... 

The largest improvement in structural and durability properties has been obtained with the PIC system. With the impregnation of a macromolecular compound, the compressive strength can be increased four times or more, the modulus of elasticity increased at least two times, the water and salt permeability reduced by 99%, the freeze-thaw resistance improved enormously, and—in contrast to conventional concrete—PIC exhibits essentially zero creep properties. Both strength and durability are strongly dependent on the fraction of the porosity of the cement phase that is filled with polymer. 

Dihydroquinolines differ in the degree of polymerization, thus influencing migratory and long-term durability properties. They are good... 

Within the limited durability studies, HPFRCC exhibited superior corrosion durability properties compared to ordinary concrete, and this warrants its potential application in RC structures for enhanced durability against corrosion. The following conclusions can be drawn for the corrosion durability of HPFRCC based on the limited studies reviewed in this paper ... 

Ahmed, S.F.U. and Mihashi, H. (2007). A review on durability properties of strain hardening fibre reinforced cementitious composites (SHFRCC). Journal of Cement and Concrete Composites, 29(5) 365-376. 

In this study. Macro-defect-free cements were produced by addition of two different epoxy resins, and their strength and durability properties were investigated from mechanical, structural and morphological point of view by using biaxial flexural strength test, contact angle measurements and atomic force microscopy (AFM). 

The presented test results show that the durability properties of mortars for corrosion protection can be further enhanced by adding polymer dispersions. 

PHAs can be either thermoplastic or elastomeric materials with variable mechanical, thermal stability and durability properties. They are water insoluble and impermeable to oxygen [14]. Due to the stereospecificity of the PHA synthase, all the hydroxyalkanoate monomers incorporated in the polymer are in the R(—) configuration, resulting in an optically pure polymer [15]. Additionally, they are biodegradable hence, they can be degraded and metabolized by microbes and by enzymes within the human body biocompatible, they do not generate toxic byproducts and some of them are piezoelectric, a property known to stimulate cell growth [4]. 

Uses Floor finish concentrate for high speed or dry brite applies. Features Exc. gloss and durability Properties Dens. 8.50 Ib/gal vise. 50 cps pH 8.5 30% NV Esi-Cryl 247 [Cook Composites Polymers]... 

Chem. Descrip. Urethane reinforced Uses Roor finish concentrate Features High speed durable Properties Dens. 8.74 IWgal vise. 100 cps pH 8.5 36% NV Esi-Cryl Beyond [Cook Composites Polymers]... 

Chem. Descrip. Acrylic resin Uses Modifier, tlexibilizer tor other acrylics Features Exc. adhesion to plastic, steel, and metallic substrates when formulated with aliphatic polyisocyanates top urethane durability Properties Dens. 8.6 Ib/gal 60% solids G-Cure 869 [Cognis/Coatings Inks]... 

Features Provides superior exterior durability Properties Amber clear liq. sol. in aromatics, aliphatics, glycol ethers limited sol. in esters, alcohols insol. in water, ketones dens. 10 Ib/gal 25% act. 

Features Solid thermoplastic broad solubility and compatibility hard, tough films with gloss, scuff resistance, and durability Properties Beads sp.gr. 1.04 vise. 3000 cps (40% Varsol 3) R B soften, pt. 172 C Sward hardness 58 (7 days) 98% NV NeoCryl B-723 [NeoResins]... 

Features High-solids speeds dry time and imparts better durability Properties Dens. 8.3 Ib/gal vise. 4000-8000 cps Seta CC flash pt. 84 F 65% solids in xylene Paramount B [Loders Croklaan Inc]... 

---