Crystallization analysis fractionation (CRYSTAF) is a new technique for the analysis of the composition of polyolefin blends. CRYSTAF fractionates blend components of different crystallizability by slow cooling of a polymer solution. During the crystallization step the concentration of the polymer solution is monitored as a function of temperature. Different from DSC, blends of HDPE, LDPE and PP are separated into the components and quantitative information can be obtained directly from the crystallization curves. Even very low amounts of one component in PE/PP and HDPE/LDPE blends can be quantified with good accuracy. The applicability of the technique for the analysis of Ziegler-Natta, and metallocene-catalyzed polyolefins is demonstrated and the analysis of waste plastics fractions is discussed.
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Pasch et al. (2000) studied this question.
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