K. Dohi, F. Kaneko, T. Kawaguchi
Apr 1, 2002
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0
Influential Citations
21
Citations
Journal
Journal of Crystal Growth
Abstract
Abstract Polymorphism of trielaidin C 3 H 5 (OCOC 17 H 33 ) 3 , which is a typical monoacid trans-unsaturated TAG, has been studied with X-ray diffraction and vibrational (IR and Raman) spectroscopy. It is clarified that the β phase changes the conformation around trans-CC bond depending on its crystallization conditions. As for the internal rotation angle of CC bonds next to trans-CC bond, the β phase grown from a hexane solution shows a significant deviation from the standard skew or skew′ conformation, which was found in the β phase grown from a methanol–chloroform–toluene mixed solution. Contrary to the ordered molecular structure of the β phase, the α phase grown from a melt at high supercooling has a disordered structure at the glycerol backbone. The polymethylene chain between trans-CC bond and ester linkage is also conformationally disordered in the α phase.