Crystallization from a heterogeneous melt

For a partially miscible mixture the binodial needs to be specified as well as its relative location on the melting temperature-composition curve. An upper critical solution temperature (UCST) type binodial is taken as an example. The analyses of other types diagrams, such as those with either a lower critical solution temperature or an hour-glass type follow in a similar manner. The parameters that determine the nature of the binodial are given by Scott.(18) If all else is equal, the nature of the 

Principles of Polymer Chemistry, Cornell University Press (1953) p. 555. 

Escola, A. and R. S. Stein, Multiphase Polymers, S. L. Cooper and G. M. Este, eds., Advances in Chemistry Series, American Chemical Society (1979). 

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The orientation of crystalline stems with respect to the lamellar interface in block copolymers is a subject of ongoing interest and controversy. In contrast to homopolymers, where folding of chains occurs such that stems are perpendicular to the lamellar interface, the parallel orientation has been observed for block copolymers crystallized from the heterogeneous melt. It is not yet clear whether this is always the preferred orientation, or whether chains can crystallize perpendicular to the lamellar plane, for example when crystallization occurs from the homogeneous melt or from solution. 

Stratum corneum lipids and lanolin share an important physical characteristic in that they can coexist as solids and liquids at physiological temperatures.33 A differential scanning calorimetry thermogram of lanolin is similar to that of stratum corneum lipids, showing two broad (heterogenous) phase transitions with midpoint melting temperatures at 21.9 and 38.3°C.16 The lower temperature peak may represent the transition from a liquid crystal to a gel phase, which has also been described for lanolin alcohols.34... 

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