Improved Chem/Bio Protection Clothing for Military Personnel by Probing Nanoscale Structure in Block Copolymers

摘要

We report a systematic investigation of the morphology of sulfonated styrenic pentablock copolymer solutions and membranes obtained from Kraton Polymers LLC. The polymer studied was poly((t-butyl- styrene)-b-(ethylene-r- butylene)-b- (styrene-r-styrene sulfonate)-b-(ethylene- r-butylene)-b-(t-butyl- styrene)). Small angle x-ray scattering (SAXS) revealed that the solutions exhibited micellar morphologies. The solution SAXS data was modeled using the Kinning-Thomas model to obtain radius of the micelle core, the radius of closest approach between two micelles and the number density of micelles; these characteristics will be correlated to suspension viscosity to aid in membrane production. The membranes have microphase separated morphologies, but the type and symmetry of these pentablock morphologies are not yet identified. All the membrane morphologies are anisotropic with smaller periodicites perpendicular to the membrane relative to in the membrane.