One-component system

In a solid-propellant rocket motor, the propellant is contained within the wall of the combustion chamber, as shown in Fig. 1. This contrasts with liquid systems, where both the fuel and oxidizing components are stored in tanks external to the combustion chamber and are pumped or pressure-fed to the combustor. In hybrid systems, one component, usually the fuel, is contained in the combustion chamber, while the other component is fed to the chamber from a separate storage tank, as in liquid systems. The solid-propellant motor also has an ignition system located at one end to initiate operation of the rocket. The supersonic nozzle affects the conversion of... 

Assemblies of two or more identical heterocyclic systems are named by placing the prefix bi- , ter- , quater- , etc., before the name of the heterocyclic system or radical. The numbering of the assembly is that of the corresponding heterocyclic systems, one component being assigned unprimed and the others primed, doubly primed, etc.,... 

An alternative is the isothermal dilution calorimeter. For an endothermic system, one component is slowly injected into the second component with the simultaneous addition of electrical energy sufficient to maintain the calorimeter isothermal. The addition is discontinued at any desired composition and the excess enthalpy determined from the initial amount of substance of component B in the vessel, the amount of substance of component A injected, and the electrical energy added to maintain isothermal conditions. The apparatus is normally designed so that the entire composition range can be covered in two experimental runs. For exothermic systems it is possible to add electrical energy... 

The properties of polymeric mixtures depend on the compatibility of the system components. Mixtures in which the polymeric components are incompatible can be considered by analogy with filled polymers. In such systems one component distributed within the continuous phase of another serves as filler. The principal regularity of the physical-chemical and mechanical behavior of the filled polymers, the boimdary layers in particular, is maintained when the filler is also a polymer. 

Inspire, Polypropylene resins, Dow Plastics Insta-Pro Foam System, One-component polyurethane foam, Insta-Foam Products Inc. Insta-Seal, One-component polyurethane foam, Insta-Foam Products Inc. 

The other method to separate polymer mixtures utilizes the full adsorption and desorption of particular components by switching eluent [120-127]. Under appropriate choice of a sorbent and eluent system, one component of the polymer mixture is separated in terms of molecular weight in the conventional SEC mode while the other components are fully retained on the surface of the sorbent. In the next step the eluent is changed so that one of the previously retained polymers is desorbed and analyzed in the SEC mode [32,123]. In the favorable case a blend of more than two components can be fractionated in sequence [124,126]. Figure 14 shows an example of the separation of a four components blend. 

Here N(E ) is the density of electron states at the Fermi level and Jex is the exchange integral. The linear term in T is in accordance with the Korringa (1950) law, which was deduced for NMR relaxation processes, but can be applied generally to relaxation processes governed by temperature. The residual linewidth Tq is due to the spatial interaction of the electron system. One component, but not necessarily the only one, that... 

The final type of polyurethane available is known as the two-part polyol system. One component contains the isocyanate containing compound such as a prepolymer or adduct and the second component is a hydroxy group terminated resin which may or may not contain a catalyst. The most commonly used hydroxy-terminated components are polyols, castor oil, hydroxy-terminated polyesters and some epoxy resins. By varying the components of such a system a wide range of cured properties can be achieved ranging from high flexibility to very hard or brittle. The curing reactions and properties of the different polyurethanes are summarised in Table 10.9. 

Chemically reactive polyurethanes include both one- and two-component systems. One-component systems are usually based on a polyether polyol treated with a polyisocyanate to give an isocyanate-terminated polymer. A one-component system cures when exposed to moisture at room temperature. One-component polyurethane hot-melt adhesives are also cured by moisture after application. Two-component systems result from the reaction of low molecular mass polyols and isocyanates or from isocyanate-terminated prepolymers with either polyols or polyamines. Two-component systems cure at room and/or elevated temperatures. 

In the case of the two-component systems, one component is usually a formulated resin system and the other a formulated hardener. The two-component systems are often supplied in twin cartridges, which pump out the two parts of the adhesive through an efficient mixing head. Thus the adhesive can be easily mixed and applied to the substrate in one operation. 

Commereial adhesives are sold as one or two part systems. One component adhesives may be 100% non volatile liquids, solvent solutions, pastes, sticks, powders, supported or imsupported films. Two part adhesives have the resin and hardener (curative) in two separate containers as Hquids or paste these are mixed just before use. These systems normally cure at room temperatures. 

Enzymes activating oxidatidh-reduotion systems, one component of which is the substrate. 

Application techniques for coatings can be considered in various ways. The stability and durability of coating is essential. Coatings that have normal wear and tear requirements are mainly based on oils and aldehyde resins. Higher durability or stability can be achieved by the use of one of the following one- or two-component systems. One-component ... 

In the case of the two-component systems, one component is usually a formulated resin system and the... 

It was thought that the particle size trends in frontal free-radical polymerization would be similar to particle size trends in SHS. In Ti + C and Ti + B systems in SHS, as particle size increases, velocity decreases (7). This trend is seen because in many SHS systems, one component must melt so that the other can diffuse into the melt and begin the reaction. The same trend was expected in frontal polymerization as seen in Figure 9. 

---