モノグリセリドの多形 (第3報) : 多形転移の活性化エネルギーについて

概要

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Activation energy of various polymorphisms of monoglycerides was measured by the use of DTA and DSC, and examinations were made on the correlation between transition process among polymorphs and length of molecular chain and crystal growth.<BR>1) Calculation of activation energy from DSC is difficult to obtain the true value because it is highly affected by the rate of temperature rise. If the values are obtained from DTA curves by Kissingers method, the values are hardly affected by measurement conditions.<BR>2) Activation energy of transition from sub-α to β type is greater than that from α to β type.<BR>3) Activation energy of transition between polymorphs decreased as follows : sub-α→α>α→β type.<BR>4) A simple linear relationship was found to be established between the number of carbon and activation energy.