Epoxy and unsaturated polyester

Corrosion Behavior of Epoxy and Unsaturated Polyester Resins in Alkaline Solution... 

In this paper, the effect of temperature and concentration on corrosion behavior and corrosion mechanism of epoxy and unsaturated polyester resins in NaOH solution were studied, and were discussed by considering their chemical structures. Corrosion rate studies were also made by applying the concept of metallic corrosion. 

Figure 1. Chemical structures of epoxy and unsaturated polyester resins.

Other chemistries have been used to prepare preformed reactive modifiers for epoxy and unsaturated polyester resins. Particles are generally composed of... 

The model that best represents the curing kinetics of thermosetting resins such as epoxy and unsaturated polyester, and as reflected in a TTT-diagram, is a diffusion modified Kamal-Sourour reaction model [9, 14, 13]. To model autocatalytic cure kinetics, the model can be applied as... 

Resin Certain liquid prepolymer products, such as epoxies and unsaturated polyesters, which are subsequently cross-linked to form hardened polymer. 

Three-component IPNs prepared from polyurethane, epoxy, and unsaturated polyester resin resulted in even broader tan 5 values when compared to two component (PU/E) IPN elastomers. Furthermore, the tan S values for the three component IPN systems were still high after the transitions were apparently complete, which is of enormous significance in sound energy absorption applications. IPN foams prepared by using PU/E (two-component) showed excellent energy absorbing abilities. This was reflected in rebound, hysteresis, and sound absorption studies. 

Polymeric compounds are specific sealing materials intended to line or impregnate conducting hardware as well as electric radio circuits for electric insulation. They are based on epoxy and unsaturated polyester resins, liquid organosilicon rubbers and monomers (initial products for S3mthesizing pol3Tnethacrylates and polyurethanes). Compounds based on thermoplastic materials (tar, rosin, cerezin) in the form of solid or wax-like masses, heated for transformation into the liquid state, are confined to this application. 

Impetus (52) for study of IPNs of epoxy and unsaturated polyester results from the lower cost and good performance possible when unsaturated polyester is mixed with epoxy resin. Since polyesters cure by a free radical mechanism, and epoxies cure by cationic initiation followed by condensation, it would appear to be possible to cure the polyester and the epoxy independently of one another. However, this does not seem to be the case. When concentrations are chosen so that the IPN has equal parts of each component, there is an unusually rapid... 

This section is devoted to describing the chemistry of vinylester resins (including polymerization reactions) along with their mechanical, thermal and chemical (corrosion resistance and dimensional stability) properties. In general, vinylester resins are deemed to combine the best properties of epoxies and unsaturated polyesters in particular, they are easily handled at room temperature, and offer mechanical properties comparable to epoxy resins (Table 4.2). Moreover, they have better chemical resistance than cheaper... 

There is some overlap in the performance of metakaolinite and calcined clay in certain polymers and hence some contiguous applications such as low-voltage rubber cable insulation, but there are significant differences, which leads to separate use patterns. Thus, metakaolinite is mainly used in PVC cable insulation because it improves (uniquely) the electrical resistivity of plasticised PVC, while calcined clay is used in polyethylene (PE) film, rubber cables, rubber pharmaceutical applications and rubber extrusions for a variety of reasons linked to its shape, size and chemical inertness. The refractory product finds limited use in epoxy and unsaturated polyester mouldings, which have to resist abrasion and chemical attack. 

Typically, sealant materials used to protect electronic components in aerospace automotive and appliance equipment are acrylics, silicones, urethanes, polysulfides, epoxies, and unsaturated polyesters. Liquid forms of these materials can he irreversihly converted to the sohd form with no significant weight loss. These types of sealing processes are called potting and encapsulating. 

---