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Small Angle X-Ray Scattering Studies Of Zinc Stearate Filled Sulfonated Epdm, D. A. Jackson, J. T. Koberstein, Robert Weiss
Small Angle X-Ray Scattering Studies Of Zinc Stearate Filled Sulfonated Epdm, D. A. Jackson, J. T. Koberstein, Robert Weiss
Robert Weiss
The crystallization, melting, and dissolution behavior of zinc stearate (ZnSt) in ZnSt-filled sulfonated poly(ethylene-co-propylene-co-ethylidene norbornene) (SEPDM) ionomers was studied by synchrotron small-angle X-ray scattering (SAXS). The melting temperature of ZnSt in the ionomer was considerably lower than in the pure state, which was consistent with the existence of very small ZnSt crystalline domains and a specific interaction between the metal sulfonate groups of the SEPDM and the metal carboxylate groups of ZnSt. Temperature-resolved SAXS showed that, on melting, some or all of the ZnSt rapidly dissolved into the ionomer. Ionic aggregates in the neat ionomer persisted up to 300°C. Microphase …
Small Angle X-Ray Scattering Studies Of Zinc Stearate-Filled Sulfonated Epdm Ionomers, D. A. Jackson, J. T. Koberstein, Robert Weiss
Small Angle X-Ray Scattering Studies Of Zinc Stearate-Filled Sulfonated Epdm Ionomers, D. A. Jackson, J. T. Koberstein, Robert Weiss
Robert Weiss
The crystallization, melting, and dissolution behavior of zinc stearate (ZnSt) in ZnSt-filled sulfonated poly(ethylene-co-propylene-co-ethylidene norbornene) (SEPDM) ionomers was studied by synchrotron small-angle X-ray scattering (SAXS). The melting temperature of ZnSt in the ionomer was considerably lower than in the pure state, which was consistent with the existence of very small ZnSt crystalline domains and a specific interaction between the metal sulfonate groups of the SEPDM and the metal carboxylate groups of ZnSt. Temperature-resolved SAXS showed that, on melting, some or all of the ZnSt rapidly dissolved into the ionomer. Ionic aggregates in the neat ionomer persisted up to 300°C. Microphase …
Solution Viscosity Behavior Of Complexes Of Poly(Γ-Benzyl-L-Glutamate) With Lightly Sulfonated Polystyrene Or Its Zinc Salt, L. Shao, Robert Weiss, R. D. Lundberg
Solution Viscosity Behavior Of Complexes Of Poly(Γ-Benzyl-L-Glutamate) With Lightly Sulfonated Polystyrene Or Its Zinc Salt, L. Shao, Robert Weiss, R. D. Lundberg
Robert Weiss
The rheological behavior of solutions containing blends of poly(γ-benzyl-l-glutamate) (PBLG) and either the free acid or the zinc salt of lightly sulfonated polystyrene (SPS) was studied as a function of blend composition, polymer concentration, degree of sulfonation of the SPS, and the polypeptide molecular weight. The zinc salt of SPS formed a transition metal complex with the amine-end groups of the PBLG, and this resulted in an enhancement of the solution viscosity relative to a weighted average of the viscosities of the individual polymer solutions. The ZnSPS/PBLG solutions showed no anomalous time or shear dependencies. In contrast, solutions containing PBLG …