Generic Temperature

Such a value for relative temperature index will be specific to a particular grade of a polymer, sometimes even to a specific colour. The difference between grades of a particular species of polymer can be substantial, depending both on the variation in the inherent stability of a material between differing manufacturing methods and also on the type and amount of additives used. It is possible to obtain from the Laboratories a Generic Temperature Index to cover a species of material but this will usually be considerably lower than for many of the individual grades within that species. 

Fig. 30 Generic temperature-density diagram for a polymer melt proposed by Olmsted et al. [4]. The horizontal axis indicates the normalized density pw, which is defined as the average mass density of the melt multiplied by the specific volume w of the monomer... 

Goetz V, Le Borgne F, PruvostJ, Plantard G, LegrandJ A generic temperature model for solar photobioreactors, Chem EngJ 175 443-449, 2011. 

Fig. 14. Generic temperature-dopant concentration, T-x, phase diagram for cuprates (schematic). The solid lines labeled and delineate the antiferromagnetic (AFM) and superconducting regions, respectively. The hatched line denoted T represents the crossover into the pseudogap state.

Because the chemical stmcture of poly(phenylene sulfide) [9016-75-5] (PPS) does not fall into any of the standard polymer classes, the Federal Trade Commission granted the fiber the new generic name of Sulfar. The fiber has excellent chemical and high temperature performance properties (see... 

Cmde petroleum is a mixture of compounds boiling at different temperatures that can be separated into a variety of different generic but often overlapping fractions (Table 1). The amounts of these fractions produced by distillation depend on the origin and properties of cmde petroleum (2). 

Many attempts have been made to characterize the stabiUty of the colloidal state of asphalt at ordinary temperature on the basis of chemical analysis in generic groups. For example, a colloidal instabiUty index has been defined as the ratio of the sum of the amounts in asphaltenes and flocculants (saturated oils) to the sum of the amounts in peptizers (resins) and solvents (aromatic oils) (66) ... 

Material (generic type) Minimum temperature Maximum temperature ... 

Generic name and description Breaking tenacity, g/denier Abrasion resistance Resistance to acids Resistance to alkalies Resistance to oxidizing agents Resistance to solvents Specific gravity Maximum operating temperature, "FI... 

Of the generic aluminium alloys (see Chapter 1, Table 1.4), the 5000 series derives most of its strength from solution hardening. The Al-Mg phase diagram (Fig. 10.1) shows why at room temperature aluminium can dissolve up to 1.8 wt% magnesium at equilibrium. In practice, Al-Mg alloys can contain as much as 5.5 wt% Mg in solid solution at room temperature - a supersaturation of 5.5 - 1.8 = 3.7 wt%. In order to get this supersaturation the alloy is given the following schedule of heat treatments. 

In summary, then, design with polymers requires special attention to time-dependent effects, large elastic deformation and the effects of temperature, even close to room temperature. Room temperature data for the generic polymers are presented in Table 21.5. As emphasised already, they are approximate, suitable only for the first step of the design project. For the next step you should consult books (see Further reading), and when the choice has narrowed to one or a few candidates, data for them should be sought from manufacturers data sheets, or from your own tests. Many polymers contain additives - plasticisers, fillers, colourants - which change the mechanical properties. Manufacturers will identify the polymers they sell, but will rarely disclose their... 

Records can quickly be grouped by generic family, exposure medium or trade name and grade. In addition, records can be searched, sorted and displayed by exposure temperature, exposure time, exposure medium concentration, and supplier or using the PDL resistance rating. Complete information can then be viewed on any individual record. 

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