Melting behavior materials

C. L. Jackson, G. B. McKenna 1990, (The melting behavior of organic material confined in porous solids), J. Chem. Phys. 93, 9002. 

The melt behavior has been shown to be greatly affected by the structure of the end-groups where an increase in the polarity of the end-groups can raise the viscosity by several orders of magnitude [118] (Fig. 10). This is of great importance in applications where low viscosity is essential for the processing of the material [119]. 

The double melting point has been observed in only one 5 of the previous studies. The initial melting point varies with the state of subdivision and is not a reliable index of purity. Several recrystallizations did not change the melting behavior or the remelt temperature. The checkers did not observe the double melting point with the product initially obtained, but did so with material recrystallized once. 

Flory-Huggins approach, may be somewhat low even with highly crystalline preparations of A- or B-type starch lintners (DP —15). Despite its theoretical limitations, the Flory analysis (as illustrated in Figure 8.10 inset) can be used to simulate the melting behavior of starch in practical applications (e.g. extrusion cooking, baking) and to compare the thermal stability of different starch materials under dynamic heating at various moisture conditions.20,25 240 337... 

Solid Fat Index. This analysis has become the most important criterion for the melting behavior and crystalline structure of fats and oils products. It determines the proportion of solid and liquid materials at a given temperature. The solid fat index (SFI) analysis is an empirical measure of the solid fat content. It is calculated from the specific volume at various temperatures using a dilatometric scale graduated in units of milliliters times 1000. Values for the solid contents are usually determined at 50°F, 70°F, 80°F, 92°F, and 104°F or 10°C, 21.1°C, 26.7°C, 33.3°C, and 40°C. Unlike the tropical oils, cottonseed and the other oleic- and lino-leic-classification oils do not contain any significant quantity of triglycerides made up of two or three saturated fatty acids therefore, the solid fat index at the lowest temperature usually measured would have minimal values. Natural cottonseed oil can have a solid fat index content at 50°F or 10°C but not at the higher temperature measurements. 

The melting behavior of the i-PS material seems to indicate the presence of two crystalline forms, with two melting temperatures marked H and L in Figure 2. The behavior of the multiple melting peaks in i-PS is actually quite complex, and as the crystallization temperature,... 

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