Diglycidyl ethers of resorcinol

Fig. la and b. IR-spectra of epoxy-amine polymers and model compounds at 298 K 36 a. 1 linear polymer VIII (see Table 3), 2-4 stoichiometric networks based on diglycidyl ether of resorcinol and m-phenylenediamine (2) and 4,4 -diaminodiphenylsulfone (3) and diglycidyl ether of hydroquinone and m-phenylenediamine (4). b. Model compounds II, III, VI (Table 3), (a) crystal (b) melt (c) glass... 

Diglycidyl ether of resorcinol 4,4 -Diamino-diphenyl sulphone 112 3 49)... 

Fig. 6. Dependence of the effective value of the trimolecular rate constant for the reaction of diglycidyl ether of resorcinol with 2,6-diaminopyridine on conversion at different temperatures79. (1) 323 K (2) 333 K. (3) 343 K. (4) 353 K...

Fig. 7. Kinetics of curing diglycidyl ether of resorcinol with 2.6-diaminopyridine in the stepwise temperature control3)...

Fig. 8. Dependence of limiting conversion on the ratio of the components (1) model calculations (2) diglycidyl ether of resorcinol with m-phenylenediamine 79 ...

Diglycidyl ether of resorcinol-based epoxy resins provide the highest functionality in an aromatic diepoxide. It is one of the most fluid of epoxy resins, with a viscosity of 300 to 500 cP at 25°C. Because of its high functionality, it is a very reactive resin and cures more rapidly than DGEBA epoxies with most conventional curing agents. 

Difunctional epoxy diluents are low-viscosity, low-MW epoxy resins. These diluents may be used at very high concentrations, and they do not greatly affect the properties of the cured resin. In some instances the difunctional epoxy diluents will actually improve properties. These materials include butadiene dioxide, vinyl cyclohexane dioxide, and diglycidyl ether of resorcinol. 

All the reactants are individual compounds of high chemical purity with epoxy equivalent close to theoretical values. It has been shown 6,7,16,17) that, at Tcure iS 110-120 °C and especially with diglycidyl ether of resorcinol (DGER) or Bis-phenol-A (DGEBA) and w-phenylenediamine (w-PhDA) as reactants, Eq. (I) proceeds practically without side reactions and yields a polymer with a chemical structure very close to that shown in above. Using different initial ratios of reactants (P = [NH]0/[EP]0 molar ratio), one can prepare a family of polymers with rather broad variations of crosslink concentration per unit volume or number of unreacted groups of different type and properties of the final products. 

Table 1. Morphology of diglycidyl ether of resorcinol + 3.0 wt% epoxy-terminated polybutadiene + 2,4,6-tri-(dimethylaminomethyl)phenol systems cured at 120 °C...

Figure 8.8. Conversion after 600 min of reaction of diglycidyl ether of resorcinol-diaminopyridine system in the presence of variable amounts of dibutyl phtha-late. [Data from Smirnov Yu N Dzhavadyan E A Golodkova F M, Polym. Sci. Sen B, 40, Nos.5-6, May-June 1998, p. 190-3.

For the one-part systems diglycidyl ethers of bisphenol and diglycidyl ethers of resorcinol have been utilised with hardeners such as dicyan-diamide, aromatic substituted ureas and boron trifluoride amine complexes. For further information on component mounting with epoxides the reader is referred to an excellent review by Marshall. ... 

---