Abstract
The phase-separation behavior of blends consisting of 4,4‘-diaminodiphenylsulfone (DDS) cured diglycidyl ether of bisphenol A (DGEBA) with polyoxymethylene (POM) was investigated by means of small-angle laser light scattering (SALLS), optical microscopy (OM), and scanning electron microscopy (SEM). Curing results in reaction-induced phase separation (RIPS). Blends with different amounts of POM at curing temperatures above (180 °C) and below (150 and 145 °C) the melting temperature of POM (Tm = 168 °C) are considered. At an isothermal curing temperature of 180 °C, all blends demix according to a spinodal decomposition mechanism with the clear signature of viscoelastic effects at specific POM contents. Furthermore, curing leads to changes in the refractive indices of the phases, occasionally resulting in an apparent phase dissolution, which disappears again at the onset of secondary phase separation. Crystallization after curing at 180 °C can only be induced by cooling and is discussed using CTT diagrams fo...
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