SANS INVESTIGATIONS OF TOPOLOGICAL CONSTRAINTS IN NETWORKS MADE FROM TRIBLOCK COPOLYMERS

A theoretical and experimental investigation of the SANS structure fac tor of labeled triblock HDH copolymer chains, randomly cross-linked in to a network, is presented. We combine the RPA method for the consider ation of the strong interchain correlations and the tube model with a harmonic deformation dependent constraining potential, modeling the ac tion of cross-links and entanglements. With this approach a successful description of the scattering behavior under strain is achieved. The sensitivity of the method allows the detection of chain splittings dur ing cross-linking with peroxides.