DYNAMIC POLYMORPHIC PHASE-TRANSITIONS IN A MODEL BINARY TRIGLYCERIDE SYSTEM MEASURED BY POSITION-SENSITIVE X-RAY-DIFFRACTION METHODS

被引:10
作者
CEBULA, DJ
SMITH, PR
机构
[1] Colworth Laboratory, Sharnbrook, Unilever Research, Bedford
关键词
Fats; melting kinetics; phase transitions; polymorphism; position-sensitive detector; triglycerides; X-ray diffraction;
D O I
10.1007/BF02540497
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
X-ray diffraction measurements have been made on a binary mixture of pure tripalmitin and tristearin which undergoes particular polymorphic phase transitions on heating from the solid. The results were obtained using a position-sensitive detector which can record the whole diffraction pattern in time periods less than a minute. This allows many patterns to be recorded during the transformations where heating rates can be up to severaloC/min. As such the transitory existence of the intermediate β' phase has been unambiguously identified. The results serve to exhibit the usefulness of the X-ray apparatus and indicate its potential for future studies in dynamic crystallization and melting. © 1990 AOCS Press.
引用
收藏
页码:811 / 814
页数:4
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