Mechanism for the formation of a solid solution and its modification phenomenon were examined in the binary systems of C
18-C
16, C
18-C
14, C
18-C
12, and C
16-C
14, using differential scanning colorimetry (DSC) and infrared (IR) spectroscopy.
1) Binary systems of C
18-C
16, C
18-C
14, and C
16-C
14 form continuous solid solution in either metastable state or stable state. At transition, they transit from sub-α and α-type solids to β-type solids, and this behavior was similar to that shown by 1-monoglyceride alone. C
18-C
12 system does not form a solid solution, and C
18 and C
12 were found to undergo transition independently.
2) Phase diagrams of C
18-C
16, C
18-C
14, and C
16-C
14 systems showed a similar pattern. Transition curve from sub-α to α-type was characteristic, the lowest temperature appeared at a specific composition ratio of the two components, and this temperature differed according to the composition ratio of the two camponents. Since C
18 and C
12 did not dissolve with each other, transition curves of C
18 and C
12 were different curves.
3) Transition rate was affected by the molecular chain length comprising the binary system, and became slower in the order of C
18-C
16, C
18-C
14, and C
16-C
14. The transition rate was the fastest in the case of short-chain monoglyceride containing 510% of longchain monoglyceride, but the rate becomes slower as the transition temperature from α to β-type becomes higher, so that, in general, the rate becomes faster with larger amount of short-chain monoglyceride contained in the long-chain monoglyceride, and became slower in the case of contrary.
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