Tetraglycidyl methylene dianiline

One possible way of characterizing the network inhomogeneity linked to spatial fluctuations of the crosslink density (Chapter 7) could be to study the width of the a dissipation band in the DMTA or DS spectra. The comparison between tetraglycidyl methylene dianiline (TGMDA) DDS... 

The subject of this study is a commercially formulated resin (Narmco Materials Division of Celanese Corp.) referred to as Resin 5208. May et. al. (21) have shown that the primary constituents of this resin are Ciba-Geigy Corporation s Araldite MY720, diami-nodiphenyl sulfone (DOS), and a glycidyl ether of a bisphenol A based novolac (Celanese SU-8). The principle component of MY720 is tetraglycidyl methylene dianiline (T6MDA). 

Resin II contains tetraglycidyl methylene dianiline (TGMDA) as the principal epoxide with small amounts of a cresol novolac and DGEBA. DICY as curing agent is present in an amount such that the amine epoxy ratio is 0.25. Diuron is the accelerator. The supplier s recommended standard cure is the same as for SP250. However, in this system approximately 20 percent of the epoxide remains unreacted following the cure cycle (1 ). Selected resin plates were subjected to additional cure at 170°C and 220°C. The samples post cured at 220 C for forty minutes showed no residual epoxide absorbance in the IR spectrum. 

Epoxy resins containing N,N -tetraglycidyl methylene dianiline (TGMDA) are widely used in the manufacture of fiber-reinforced structural composites for aerospace applications. 

By reacting epichlorohydrin with aromatic diamines, it is possible to manufacture epoxy resins with higher functionality than DGEBA or DGEiBF resins. As shown in Fig. 5.9, the structure of tetraglycidyl methylene dianiline epoxy, the most important glycidyl amine, is characterized by four epoxy... 

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