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- Title
Kinetics of melt crystallization and transformation of tripalmitin polymorphs.
- Authors
Sato, Kiyotaka; Kuroda, Tatsuhiko
- Abstract
The rates of melt crystallization and phase transformation of three polymorphs of tripalmitin were examined by optical microscopy, X-ray diffractometry and DSC with and without surfactant additives (sorbitan mono- and tristearates). The following results were obtained: (a) Crystallization rate increased in order of α, β′ and β; (b) transformation rate was slower than crystallization rate for each polymorph at the same temperature examined; (c) when the most stable β form was recrystallized from the melt just after the melting of α, its recrystallization rate was much higher than that by simple melt-cooling; (d) surfactant additives retarded both the crystallization and transformation of all the polymorphs, yet β′ was influenced the most. A mechanistic interpretation based on the molecular structures both of the melt and of each polymorph is presented.
- Publication
Journal of the American Oil Chemists' Society (JAOCS), 1987, Vol 64, Issue 1, p124
- ISSN
0003-021X
- Publication type
Article
- DOI
10.1007/BF02546266