Compatibility of polystyrene/polyolefin blends containing compatibilizing agents, 2 - Extraction behavior

Polystyrene (PS)/polyolefin (PO) blends in various mixing ratios compatibil ized by a triblock copolymer polystyrene-block-poly (ethene-co-butylene)-bl ock-poly styrene (SEBS) and a diblock copolymer polystyrene-block-poly(ethe ne-co-propene) (SEP) and subsequently gamma -irradiated were prepared. The blends have been subjected to extraction in different solvents (chloroform or toluene) for various periods of time to obtain porous films. The efficie ncy of the extraction and the morphology of the films have been assessed by infrared spectrometry (IR), optical and electronic microscopy, differentia l scanning calorimetry (DSC) and thermogravimetry (TG); glass transition, m elting heat, thermal stability, overall kinetic parameters and weight losse s have been evaluated. The extraction behavior is close related to compatib ility of the components, so on the base of the obtained results optima comp atibility ratios have been established.