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In a realistic polymer blend system,for example:a polyolefin blend or a toughened polystyrene system,phase separation is often encountered together with either crystallization or glass transition or sometimes both.These will make the phase separation kinetics very complicated,so is the morphology and the properties of the materials.The most common cases include the interactive phase separation and crystallization,and /or asymmetrical phase separation due to the large molecular weight difference or glass transition temperatures difference between the components.The situation could become much more complicated when all three transitions are close to each other and interact with each other spatially as well as temporally.