Abstract
Aromatic silsesquioxoxanes with amine-groups are used as hardeners of epoxy resins. Mixing them with epoxy is often a challenge as they are usually solid or high viscous. To obtain materials with improved properties it is necessary to find a way to introduce silsesquioxane in epoxy. The present paper reports the influence of the ladder-like (methyl-phenyl)silsesquioxane with aminopropyl substituents (NH2-SSQO) on the curing and properties of epoxy composites. Diluent-co-hardener to introduce NH2-SSQO in epoxy resin was proposed. Reaction between the epoxy resin and NH2-SSQO was proved by ATR-IR spectroscopy and Soxhlet extraction. Thermomechanical analysis showed that NH2-SSQO/epoxy composites have increased deformability, but lower glass transition temperatures and crosslinking density. NH2-SSQO/epoxy composite with optimal amount of silsesquioxane has improved mechanical properties, adhesion, cracking and water resistance.
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