Lyotroic liquid crystals from nonionic surfactant (TX-10), styrene, and water were studied at 30℃ to determine the phase regions and obtain some typical photographs by using microscope with polarized-light. And the geometrical dimensions were determined by low angle X-ray diffractrion. The X-ray data showed that the structure of mesophase disclosed lamellar liquid crystals with Bragg spacing ratio of 1:1/2:1/3... For these lamellar liquid crystals the results indicated a linear increase of the interlayer spacing with addition of water or styrene and pronounced decrease with addition of TX-10 in the system. The ^2H NMR methods were specially applied to determine the exact liquid crystals' structure. It was found that the structure varied from mixed W/O type microemulsions and lamellar liquid crystals to single lamellar liquid crystals to single hexagonal liquid crystals to hexagonal liquid crystals and O/W type microemulsions in the liquid crystal region with the addition of the water. These results were discussed theoretically.

Key words: WATER, STYRENE, TERNARY SYSTEM, PHASE DIAGRAM, 2D NMR SPECTROMETRY