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A hypothesis providing a guideline for the development of immiscible polymer blends with co-continuous phase structure at very low critical volume fraction of one component is postulated and experimentally verified. Based on a number of simplifying assumptions the following relation was derived: φ cr =k(λ) 1-z /(θ b* ) z where λ is a Deborah number...
Dual-phase continuity and phase inversion of polystyrene (PS)/poly(methyl methacrylate) (PMMA) blends processed in a twin-screw extruder was investigated using a selective extraction technique and scanning electron microscopy. Emphasis was placed on investigating the effects of viscosity ratio, blend composition, processing variables (mixing time and annealing) and diblock copolymer addition on the...
The morphology evolution of polycarbonate-polystyrene (PC/PS) blends during the compounding process in three blending methods of industrial relevance, namely melt blending, re-melt blending in a twin-screw extruder and tri-melt blending in an injection-moulding machine, was investigated using scanning electron microscopy (SEM) to examine nine blend compositions. Blends were prepared at compositions...
The influence of A-B diblock copolymers on coalescence in A:B blends has been studied by rheo-optical measurements and electron microscopy. Divergent criteria and experimental evidence appear in the literature on the block copolymer (BC) molecular weight (M W ) and volume fraction ( bc ) when the requirement is the BC to reside at the interface. In the present study the block...
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