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Thermal analysis of 1,2‐epoxypropyl esters of normal fatty acids
Author(s) -
FernándezMartín F.
Publication year - 1973
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/bf02640472
Subject(s) - differential scanning calorimetry , enthalpy , enthalpy of fusion , melting point , homologous series , chemistry , stearate , molecule , infrared spectroscopy , thermal analysis , fusion , solvent , carbon chain , raman spectroscopy , fatty acid , crystallography , organic chemistry , thermal , thermodynamics , linguistics , physics , philosophy , optics
Seven members of this homologous series have been studied by differential scanning calorimetry (DSC), and their melting point, enthalpy and entropy of fusion obtained. The entropy change for each additional carbon‐carbon bond in the aliphatic acid chain closely observed the value R ln 3, as expected for flexible molecules. IR spectra of crystalline glycidyl miristate, palmitate and stearate showed the typical band progression in the 1180–1350 cm −1 region and a doublet at ca. 720±10 cm −1 . Glycidyl esters appeared to be free of polymorphism, since no differences in the behavior of solids crystallized from solvent or from the melt were observed either by DSC or by IR spectroscopy.