We have developed several new techniques for examining the domain morphologies of microphase-separated block copolymers. By selective degradation and removal of the matrix component of suitable block copolymers, the domain-forming component can be left intact in its original morphological form and available for characterization. Thus we have selectively removed the polydiene (polybutadiene or polyisoprene) matrix component of poly(styrene-b-diene) copolymers by treatment with ozone. The remaining polystyrene domains were stained with ruthenium tetroxide or shadowed with platinum and examined by electron microscopy. A marked improvement in the ability to distinguish domain morphologies and their three-dimensional character was found when these degradation techniques were used. Details of domain morphologies that were not apparent when using conventional osmium tetroxide staining methods on undegraded films often became clearly apparent with this new technique
Посилання на статтю:
New techniques for determining domain morphologies in block copolymers / Donald R. Smith and Dale J. Meier // Polymer. – 1992. – Vol 33. – P. 3777-3782.