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- W1977524944 abstract "Abstract The changes in physical and chemical states with time at the very late stage of the cure process in a thermoset/thermoplastic blend, triglycidyl p-aminophenol (epoxy)/poly(ether sulfone) (PES)/4,4′-diamino-diphenylsulfone (curing agent), were investigated by dynamic mechanical analysis (d.m.a.) and Fourier-transform infra-red analysis (FTi.r.). D.m.a. showed the two-phase character: two-step decrease in the dynamic storage modulus E′ versus temperature curve and two peaks in the dynamic loss tan δ versus temperature curve, indicating phase separation via reaction-induced spinodal decomposition (which was confirmed by scanning electron microscopic observation). The low-temperature tan δ peak assigned to the Tg of the PES-rich phase was elevated and the high-temperature peak assigned to the Tg of the epoxy-rich phase was depressed with increasing cure time. The inward shift of the two Tg values was quite strange. This strange shift was interpreted by taking account of the segregation of epoxy oligomer from crosslinked epoxy network in the neat epoxy system (probably by micro-gel formation) and the chain scission of the epoxy network established via etherification. That is, the low Tg of PES/epoxy oligomer mixture shifts to a higher temperature to attain the Tg of neat PES by converting the oligomer to the network, and the high Tg of the segregated pure epoxy network shifts to lower temperature by chain scission." @default.
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- W1977524944 date "1995-05-01" @default.
- W1977524944 modified "2023-09-26" @default.
- W1977524944 title "Dynamic mechanical and Fourier-transform infra-red analyses on the very late stage of the cure process in thermoset/thermoplastic blends: trifunctional epoxy/poly(ether sulfone)" @default.
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- W1977524944 doi "https://doi.org/10.1016/0032-3861(95)91442-a" @default.
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