Abstract
Dielectric spectroscopy is employed in lamellar forming non-linear block copolymers of the type (BA)(3)B and (BA)(3)B(AB)(3) based on polyisoprene (A) and polystyrene (B), at temperatures well below the order-to-disorder transition temperature and below the glass transition temperature of the hard phase (polystyrene). We show here that dielectric spectroscopy can be used as a tool to probe the interface in ordered block copolymers with a basic triblock unit. Our estimate of the interfacial width is based on the mobility of the junction points at the interface and compares favorably with the estimated thickness from thermodynamics. (C) 1998 Elsevier Science B.V. All rights reserved.