Multiphase Polymer Systems: Morphology and Optical Properties by Light Scattering Methods

摘要

Time-resolved light scattering, diffuse reflectance measurements and image analysis were conducted to investigate the morphology and supermolecular structue 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 PMM minor phase. The time evolution of the co-continuous structure in polystyrene-PMMA blends was studied during an annealing process. The spinodal peak position, q_(max)(t,T), (where q_9max) is the wavenumber of the periodicity in the co-continuous structure) and the corresponding intensity I_(max)(t.T) was compared with theoretically predicted values of exponents for distinct time scales of the phase dissolution under various temperatu regimes. the influence of diblock copolymers on the kinetics of phase separation and dissolution of polymer blends with a co-continuous structure was studied.