Abstract
Copolymers prepared from the epoxy resin of ALBIFLEX and PMPS oligomer were evaluated with IR, 1H-and 13C NMRs for structural determinations. The flexible epoxy resin as a model compound was examined by TSC with variations on the operational parameters tp and Vp. Transitions denoted as Tg,δ, Tg,γ, Tg,β, Tg,α and Tg,ρ in increasing order of temperature were observed for these copolymers. As an example, ESAF-7430 copolymer showed these transitions at −138, −84, 26, 87, and 110 °C, respectively. Each transition except the Tg,ρ at 110 °C, has been correlated to a segment in the copolymeric structure. The result indicates that TSC provides clear molecular transitions at the temperature of the transition. The molecular transition of the grafted PMPS-siloxane segment in an epoxy matrix appeared at the −45 °C region as a broad, nearly flat peak as it filled the concave part of the TSC curve of the unmodified resin. The flexibility that the modified copolymers retained may be attributed to these sub-Tg transitions as observed in the TSC spectrum.
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