The Malaysian Journal of Analytical Sciences Vol 17 No 1 (2013): 101 – 108

 

 

 

PHASE BEHAVIOR AND RHEOLOGY OF FATTY ALCOHOL SULPHATE, FATTY ALCOHOL ETHER SULPHATE FROM PALM BASED AND MIXTURES WITH OTHER SURFACTANTS

 

(Kelakuan Fasa dan Reologi Lelemak Alkohol Sulfat, Lelemak Alkohol Eter Sulfat Berasaskan Sawit dan Campuran dengan Surfaktan Lain)

 

Liew Kin Hong, Nur Syazani Harun, Mohd Suzeren Md Jamil, Rahimi M. Yusop*

 

School of Chemical Science and Food Technology, Faculty of Science and Technology

Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia

 

*Corresponding author: rahimi@ukm.my

 

 

Abstract

The phase diagrams of fatty alcohol sulphate (FAS)/ fatty alcohol ether sulphate (FAES)/soap (4.5:4.5:1.0)/propylene glycol/water mixtures were established at 60˚C. The birefringence was observed under cross polarisers and their phases changes examined under a polarized microscope. The results showed that the liquid crystalline region for FAS and FAES occurred only in a small region. The optical patterns of lamellar liquid crystal were identified as oily streaks structure. The rheological tests of lamellar liquid crystal were carried out in the region of 4.5/4.5/1 FAES/FAS/soap with 0% PG and 10% of water. The rheological tests used were flow curve, 3 interval thixotropy test (3ITT), oscillation (dynamic test) stress sweep test and frequency sweep test measurement done using a cone-plate sensor (25mm, 1^o). The flow curve was fitted to a Casson model to obtain values for the consistency coefficient and the flow behavior index. The lamellar liquid crystal show typical flow behavior and stress influenced the recovery of the structure. Linear visco-elastic (LVE) range analysis show the critical stress value at 0.475%,  and elastic modulus was dominant over an angular frequency range studied.

 

Keywords: Lamellar liquid crystal, FAS, FAES, ternary phase diagram, rheology

 

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