The Effect of a Triblock Copolymer on the Structure of an Water-in-oil Microemulsion Conference Paper uri icon

abstract

  • The effect of addition of the PEO-PDMS-PEO triblock copolymer on the structure of the AOT (sodium di-2-ethxylsulfosuccinate)/alpha D_2O/Decane microemulsion system has been investigated by small angle neutron scattering. Polyethylene oxide (PEO) is soluble in the aqueous phase, while the poly-dimethyl siloxane (PDMS) is soluble in oil phase. The water- to-surfactant molar ratio was kept constant at 38/1, forming spherical droplets. Upon adding the copolymer, the neutron pattern changes from that of isolated spherical droplets to that of an interacting system. As the copolymer concentration and/or the volume fraction of the aqueous phase are increased, the peak position shifts toward the larger Q. Both poly- dispersed hard sphere model and Teubner-Strey model for bicontinuous structures have been used to analyze the evolution of the structure upon the copolymer addition. The …

publication date

  • January 1, 2002