By Magda A. El-Nokaly

Polymer organization buildings: Microemulsions and Liquid Crystals, Edited by means of Magda A. El-Nokaly

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Extra info for Polymer Association Structures. Microemulsions and Liquid Crystals

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In t h i s paper, we w i l l present some data on the formation of water i n n-tetradecane microemulsions using an A-B-A block copolymer. The A portions are poly(12-hydroxystearic acid) whereas the Β i s PEO. A cosurfactant, namely n-butanol, was used f o r preparation of these microemulsions. For a systematic study of microemulsion composition, i t i s e s s e n t i a l to e s t a b l i s h the phase diagram of the system under investigation. From these one can i d e n t i f y the extent of the microemulsion region and i t s r e l a t i o n to other phases (13)· The various phases found were i d e n t i f i e d q u a l i t a t i v e l y using phase contrast and p o l a r i s i n g microscopy.

Light Scattering Figure 4 shows p l o t s of R Q versus volume f r a c t i o n of water, f o r the two surfactant concentrations studied, namely 20% B246 and 10% B246. R Q increases with increasing water concentration f o r both surfactant concentrations. This increase i n R^Q indicates the size or number of the microemulsion droplets are increasing as the volume f r a c t i o n of water i s increased. I t i s also c l e a r from Figure 4 that the R Q values are higher f o r the higher surfactant concentration again i n d i c a t i n g the formation of a larger number of droplets.

B246 7 TETRADECANE +20 7- B & 6 c Figure 2 Phase diagram f o r the quaternary system tetradecane, b u t a n - l - o l , water, B246 at 7°C ( a ) , 23°C (b) and 40°C ( c ) . Total concentration of B246 i s 20%. ; ACS Symposium Series; American Chemical Society: Washington, DC, 1989. 27 28 POLYMER ASSOCIATION STRUCTURES tetrahedron i n Figure 3, f o r the r e s u l t s obtained at 23°C. Similar representations may be made f o r the other temperatures. The front of the tetrahedron represents the ternary water-n-butanol-tetradecane system and the corners of the t r i a n g l e represents the pure components.

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