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Dilatometric properties of some butyropalmitins, butyrostearins, and acetopalmitins
Author(s) -
Feuge R. O.,
Lovegren N. V.
Publication year - 1956
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/bf02665113
Subject(s) - melting point , phase transition , glyceride , crystallography , solid state , diffraction , chemistry , materials science , thermodynamics , physics , organic chemistry , optics , fatty acid
SummarySix aceto‐ and butyroglycerides, including di‐and triglycerides, were prepared and purified, and a number of their physical properties were determined. Melting and transition points for each of the glycerides were determined by experiments with small portions of the samples in capillary tubes; the “thrust‐in” technique was employed to detect some polymorphic transitions occurring in intervals as short as one second. Using the data on melting and transition points, dilatometric data were obtained, insofar as possible, for the various crystalline modifications of the compounds as well as for the liquid state. From the dilatometric data calculations were made for expansibilities in the liquid and various solid states, and melting dilations for several solid states. In one instance the volume change on phase transition, without melting, was calculated. From X‐ray diffraction patterns the long and short crystal spacings for the highest melting forms of several of the glycerides were determined. On the basis of the short spacings, polymorphic designations commonly used for fats and oils were assigned. The long spacings obtained indicated a triple chain length structure for some of the compounds and as yet an undetermined structure for the other compounds.