Analysis of Blend Compositions

Although several previous investigations considered the Crystaf analysis of blends, they merely intended to quantify the limitations of Crystaf due to CO crystallization [1,2]. Only more recently has Crystaf been used to provide quantitative information on blend compositions [55,65,66]. 

The application of Crystaf analysis for detecting blend composition is, of course, limited by cocrystalhzation, particularly if accurate quantitative information is required. As previously discussed, cocrystalUzation is found to be significant when two chain populations crystallize at relatively close temperature ranges (small A Tq), even for very slow CRs. Therefore, the use of Crystaf for determining blend compositions will be more adequate when the blend components have distinctly separated Crystaf peak temperatures (large ATc). Preferably, the difference between Crystaf peak temperatures should be more than 10 °C, particularly in the case where the blend components have similar molecular structures. 

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