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Time-resolved small angle x-ray scattering (SAXS) was used to examine thekinetics of the transition from HEX cylinders to BCC spheres at varioustemperatures in poly(styrene-b- ethylene-co-butylene-b-styrene) (SEBS) inmineral oil, a selective solvent for the middle EB block. Temperature-ramp SAXSand rheology measurements show the HEX to BCC order-order transition (OOT) at~127 oC and order-disorder transition (ODT) at ~180 oC. We also observed themetastability limit of HEX in BCC with a spinodal temperature, Ts ~ 150 oC. TheOOT exhibits 3 stages and occurs via a nucleation and growth mechanism when thefinal temperature Tf < Ts. Spinodal decomposition in a continuous orderingsystem was seen when Ts< Tf < TODT. We observed that HEX cylinders transform todisordered spheres via a transient BCC state. We develop a geometrical model ofcoupled anisotropic fluctuations and calculate the scattering which shows verygood agreement with the SAXS data. The splitting of the primary peak into twopeaks when the cylinder spacing and modulation wavelength are incommensuratepredicted by the model is confirmed by analysis of the SAXS data.

macromolecules

Kinetics of HEX-BCC Transition in a Triblock Copolymer in a Selective  Solvent: Time Resolved Small Angle X-ray Scattering Measurements and Model  Calculations