ISSN:
1435-1536
Keywords:
Methoxypolyoxyethylene dodecanoate
;
phase diagram
;
upper limit temperature of mesophase
;
cloud point
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00652420
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