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• W2017441908 endingPage "2694" @default.
• W2017441908 startingPage "2686" @default.
• W2017441908 abstract "Ternary blends based on a stoichiometric mixture of diglycidyl ether of bisphenol A (DGEBA) and 4,4‘-diaminodiphenyl sulfone (DDS), monodisperse polystyrene (PS, 8.3 × 104 g/mol), and monodisperse poly(methyl methacrylate) (PMMA, 8.86 × 104 g/mol) were polymerized at constant temperature. Blends containing a total amount of 8 wt % of both thermoplastics (with different PS/PMMA ratios), were initially homogeneous at 135 °C. When they were polymerized at this temperature, a double phase separation was clearly observed by light transmission. At conversions close to 0.08, the system became opalescent due to the generation of a PS-rich phase; at conversions close to 0.27, a new phase separation process took place, generating a PMMA-rich phase. TEM (transmission electron microscopy) observations confirmed the existence of three different phases: the epoxy matrix, PS-rich particles with a broad size distribution, and PMMA-rich particles. Some of the PS particles appeared encapsulated by the PMMA-rich phase (core−shell particles). The double phase separation process was analyzed using a Flory−Huggins model. Experimental results could be explained by following the evolution of phase diagrams with conversion. The initial composition was located in the region of homogeneous solutions. As conversion increased, the system entered the equilibrium region between two phases (first phase separation process), and at higher conversions it attained the region where three phases coexist at equilibrium (second phase separation process). Depending on the PS/PMMA ratio, the model predicted the possibility of a phase inversion following the first phase separation process. This was also inferred from measurements of the evolution of the complex viscosity during polymerization." @default.
• W2017441908 created "2016-06-24" @default.
• W2017441908 creator A5039201192 @default.
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• W2017441908 date "2001-03-14" @default.
• W2017441908 modified "2023-10-18" @default.
• W2017441908 title "Double Phase Separation Induced by Polymerization in Ternary Blends of Epoxies with Polystyrene and Poly(methyl methacrylate)" @default.
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• W2017441908 doi "https://doi.org/10.1021/ma000429a" @default.
• W2017441908 hasPublicationYear "2001" @default.
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