Abstract

Time-resolved light scattering, diffuse reflectance measurements and image analysis were conducted to investigate the morphology and supermolecular structure of two polymer systems: (i) polymer composites with dispersed particles in the polymer matrix and (ii) co-continuous structure of polymer blends. We used a video reflectometer to measure the reduced scattering coefficient from a series of non-oriented samples made of polypropylene composites (polypropylene matrix-EPDM particles) and polycarbonate-poly(methyl methacrylate) (PC-PMMA) blends with various amounts of anisometric PMMA minor phase. The time evolution of the co-continuous structure in polystyrene-PMMA blends was studied during an annealing process. The spinodal peak position, qmax(t,T), (where qmax is the wavenumber of the periodicity in the co-continuous structure) and the corresponding intensity Imax(t,T) was compared with theoretically predicted values of exponents for distinct time scales of the phase dissolution under various temperature regimes. The influence of diblock copolymers on the kinetics of phase separation and dissolution of polymer blends with a co-continuous structure was studied.

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