Page 165 - Handbook of Plastics Technologies

THERMOSETS

THERMOSETS 3.35

FIGURE 3.31 Aromatic amines for cure of ep-
oxy resins.

TABLE 3.31 HDT of Amine-Cured
Epoxy Resins

Polyethylene polyamines 111°C
Methylene dianiline 144°C
Metaphenylene diamine 150°C
Diamino diphenyl sulfone 190°C

FIGURE 3.32 Cycloaliphatic amines for cure of epoxy resins.

3.1.4.2.2 Acids. Acids can open the epoxy ring and thus produce polymerization and
cure (Fig. 3.33). Some acids function primarily as catalysts, while others function as
comonomers that build the cross-links into the cured epoxy resins.
Lewis acids such as ZnCl , AlCl , FeCl , and BF adducts act as latent catalysts for
3
3
3
2
one-part systems with good shelf life, which become active in heat cure. Phenols and or-
ganic acids also act as catalysts for cure reactions.

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