Epoxy toluene oligomer

The epoxy toluene oligomer was also obtained by alkylation of toluene with PEC as shown in Scheme (10). 

The structure of the products were characterized by two detector gel-chromatography (recractometer and UV). The direction of the alkylation reaction of toluene with EC was changed depending on the reaction condition as follows if the ratio of toluene-EC is 1 5 mol, the alkylation reaction is toward obtaining the PEC at 273 K and if the ratio is reverse at 333 K, the reaction undergone to obtain epoxy toluene oligomer is shown in Fig. 1. 

Figure 1. Infrared spectra for a toluene diisocyanate modified hydantoin epoxy/2-ethyl-l,3-hexanediol oligomer showing the OH and NH bands of the oligomer as a function of temperature in uncatalyzed and catalyzed formulations.

Figure 47. Linear correlation between the experimental activation energy in the glassy state for the JG P-relaxation process (abscissa) and the activation energy predicted by the CM for the primitive relaxation (ordinate). Symbols for simple van der Waals molecules, H-bonded systems, polymers, chlorobenzene/toluene mixture, and epoxy oligomers are shown in the figure. The solid line is a linear regression of data (linear coefficient 0.99 0.01).

The complexes of imidazole with the salts of organic and inorganic acids (Table 3, NN 54) were introduced into the epoxy compositions by dissolving them in methanol and toluene [495]. The metal imidazolates harden the epoxy oligomers at 50-200°C the polymers obtained have a high defiection temperature and hardness as well as good fire retardance [492]. 

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