LAMELLAR LIQUID-CRYSTALS OF ZWITTERIONIC SURFACTANTS WITH HYDROCARBONAND POLYISOBUTYLENE CHAINS

Surfactants from either polyisobutylene or alkylsuccinic anhydrides de rivatized with diethanolamine in a 1:1 molar ratio with hydrocarbon an d polyisobutylene chains of similar length formed lamellar liquid crys tals in situ and also with added water. The repeat distance between la yers was determined using low angle X-ray diffraction (LAXD), and the water penetration into the hydrocarbon space in the lamellar structure was calculated. The results revealed a significantly increased repeat distance for the polyisobutylene chain surfactants compared to the al kyl analogues. The water penetration was significantly greater for a s urfactant with a decyl chain compared to the one with a dodecyl chain and was intermediate for the polyisobutylene based surfactant.