Phase behavior of methoxypolyoxyethylene dodecanoate as compared to polyoxyethylene dodecyl ether and polyoxyethylene methyl dodecyl ether |
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| Authors: | M Fujiwara M Miyake I Hama |
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| Institution: | (1) Present address: Surface Science Research Center, Lion Corporation, Hirai 7-13-12, Edogawa-ku, 132 Tokyo, Japan;(2) Process Engineering Center, Lion Corporation, Hirai 7-13-12, Edogawa-ku, 132 Tokyo, Japan |
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| Abstract: | The phase behavior of binary systems composed of water and nonionic surfactants were investigated. The nonionic surfactants studied were the methoxypolyoxyethylene dodecanoates (R11COO(EO)
n
CH3,n=4.9, 6.1, 7.3, 9.3, and 12.8, wheren is the average number of oxyethylene units).The phase behaviors of R11COO(EO)
n
CH3 were compared with those of the polyoxyethylene dodecyl ethers (R12O(EO)
p
H) and polyoxyethylene methyl dodecyl ethers (R12O(EO)
q
CH3) which have been previously reported. It was found that the R11COO(EO)
n
CH3s have lower cloud points and lower upper limit temperatures for the existence of the mesophase as compared to the other two types. A R11COO(EO)12.8CH3/water system had favorable solution properties for practical use, such as a relatively narrow hexagonal liquid crystalline region and a lower melting point than the ordinary alcohol ethoxylate type nonionics. |
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| Keywords: | Methoxypolyoxyethylene dodecanoate phase diagram upper limit temperature of mesophase cloud point |
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