Thermoreactive resin

Polyesteresteiketone offer properties of thermoreactive resin, can be easily pressed, undergoes overtone, and resists the influence of alkalis. 

The compositions on the basis of polyesteresterketones already compete with those based on thermoreactive resins when making parts of military and civilian aircrafts. Sometimes it is possible to cut the weight on 30% if produce separate parts of plane engines from reinforced polyesteresterketones. 

G. S. Petrov and A. N. Levin, Thermoreactive Resins and Plastmasses, Goskhimizdat, Moscow, 1959. 

Rubber processing was carried out in the presence of a thermoreactive resin (of the resole type), a chemical reaction between the two component being thus produced. The results obtained have a special applicative value, evidencing the possibility to synthesise new products, under intense shearing regimes, with improved operation properties comparatively to the inital rubbers. 

Plienoplasts manufactured on tlie basis of thermoreactive plienolfornialde-hyde resin, liarden on licaling up to 120-170°C and tlien become insoluble. Tlicy are usually reinforced with asbestos fiber. 

Phenoplasts manufactured on tlie basis of thermoreactive phenolformalde-hyde resin, harden on heating up to 120-170°C and then become insoluble. They are usually reinforced witli asbestos fiber. 

HRs can also be classified from other points of view. In terms of consistency, they can be liquid, semisolid, and solid, while in terms of reactivity they can be thermoplastic and thermoreactive. Nonmodified HR reactivity depends on the degree and nature of unsaturation. Thus, aromatic, mixed (aromatic-aliphatic), and terpenic resins, as well as copolymeric aliphatic resins in the synthesis of which conjugated dienes take a major part, have a thermoplastic character. Resins produced through conjugated-diene polymerization have a thermoreactive character. The same character is held hy cyclopentadiene resins and modified HRs [7]. 

HRs of all types can be chemically modified by various reactions—either polymer-homologous transformations or copolymerization processes (grafted or block). Except for the hydrogenation, these reactions transform HRs from neutral, nonpolar materials to polar, basic or acid products capable of participating in various subsequent reactions. These modifications determine essential changes of HR physical and chemical properties. These resins become water soluble, thermoreactive, and compatible with polar materials. 

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