CHARACTERIZATION OF FATTY-ACID METHYL-ESTERS BY THERMAL-ANALYSIS

被引：12
|
作者：
REY, FJ
CHAMORRO, O
GIL, FJM
GIL, JM
机构：
[1] Laboratorio de Analisis Térmico, E.T.S.I.I. Universidad de Valladolid
来源：
JOURNAL OF THERMAL ANALYSIS | 1993年 / 40卷 / 02期
关键词：
FATTY ACID METHYL ESTER; TG DTG AND DTA; THERMAL STABILITY; POLYMORPHISM;
D O I：
10.1007/BF02546615
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
The thermal stability of selected straight-chain (C6-C-14) esters of fatty acids has been studied by TG-DTG and DTA analysis. In DTG, a peak is detected between 84-degrees and 125-degrees-C followed by a main effect in the range 105-degrees-215-degrees-C, whereas in DTA only an exothermic peak appears in the range of 126.5-degrees to 187-degrees-C (onset temperatures). The temperatures of these effects have been related with ignition points, molecular weights and boiling points. The characteristics of melting and recrystallization of the above fatty acid methyl esters and those with carbon numbers between C-14 and C24 have been established by DSC along the melting range between -83-degrees and 50-degrees-C. Polymorphism appears in caproic, heptanoic, palmitic and stearic acid methyl esters.
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页码：463 / 473
页数：11
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