Epoxy resins aerospace

KONG Volume Recovery in Aerospace Epoxy Resins... 

Aotlvatlon energy of flberlte epoxy, 141-43 Aerospace epoxy resins curing process, 127-29 density, 129,143 differential scanning calorimetry, 138-42... 

A typical cured aerospace epoxy resin is highly cross-linked and may contain a dispersed nonpolar thermoplastic or rubber which reduces the equilibrium moisture content and hmits the reduction in Tg. As shown in Table 12.2, more advanced systems, such as an epoxy—cyanate ester blend, absorb lower concentrations of water at equilibrium. However, the water is not uniformly distributed so that the epoxy phase is stiU plasticised to the same extent. Figure 12.12 shows that the different component epoxies and/or hardeners are plasticised differentially with the development of additional relaxation peaks. We discussed the different degrees of water molecule hydrogen bonding as a function of network polarity in this chapter. 

Cure analysis of thermoset thin films by ETIR emission has also been reported [500]. FTIES was used to smdy cure monitoring of aerospace epoxy resins and prepregs and provides a rapid method for prepreg quality acceptance [501]. Also curing of commercial polyurethane two-component paints has been carried out by FUR emission [493]. 

Thornel is made by Amoco, AS4 by Hercules and the aramid fibre, Kevlar 49, by du Pont. 934 and 3501-6 are aerospace epoxy resins from Fiberite and Hercules, respectively. 

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