Abstract
Two liquid crystalline (LC) epoxy resins were synthesized by curing LC diepoxide with LC hardening compound, diglycidyloxy azoxybenzene (DGA) with 4,4'-bis(ω -carboxy decanoxy) azoxybenzene (CAA10) and DGA with 4,4'-bis(ω-hydroxy undecanoxy)azoxybenzene (HAA11), and their reaction mechanism, mesomorphic phase transition and thermal exparasion were investigated. The fully gelated DGA-CAA10 formed a network structure in which one interchain crosslink was made per 5,6 repeating unit, and showed no mesophase. The DGA-HAA11 of linear typed polymer showed a smectic A phase when not fully cured but nematic phase with curing. Thermaal expansion coefficient (α)was about 2.2 × 10-4 ℃-1 below Tg and 3.4 × 10-4 ℃-1 above Tg for the fully gelated DGA-CAA10 and about 2.3 × 10-4 ℃-1 below Tg and about 6.5 × 10-4 ℃-1 above Tg for the fully cured DGA-HAA11.
