Phase behavior of binary mixtures of cis-monounsaturated fatty acids with different ω-chain length

✍ Scribed by Tohru Inoue; Isamu Motoda; Nobuyasu Hiramatsu; Masao Suzuki; Kiyotaka Sato

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 534 KB
• Volume: 63
• Category: Article
• ISSN: 0009-3084
• DOI: 10.1016/0009-3084(92)90040-v

✦ Synopsis

Phase diagrams of binary mixtures of oleic acid (OA)/palmitoleic acid (POA) and OA/myristoleic acid (MOA) were constructed by differential scanning calorimetry to examine the mixing behavior of cis-monounsaturated fatty acids with different ~0-chain length in polymorphic phases. The phase diagram for OA/POA mixtures demonstrates that the molecular compounds of OA3POA 2 and of OAIPOA 2 are formed in a phase and in 3' phase, respectively. The compound forms solid solutions with OA and also with POA in the ~t phase, whereas both OAIPOA2/OA and OA I POAJPOA in 7 phase are perfectly immiscible. As for OA/MOA mixtures, the compound OA2MOA 3 is formed from MOA and the c~ polymorph of OA. The solid solution is formed between the compound and MOA, while the miscibility between the compound and OA is much poorer. The present study reveals that the conformational state of the ~,-chain, i.e. ordered (3,-form) or disordered (c~-form), strongly affects the phase behavior of binary mixtures of cismonounsaturated fatty acids.