Browsing by Author "Boysen, Nils"

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    Tuning the Permeation Properties of Poly(1-trimethylsilyl-1-propyne) by Vapor Phase Infiltration Using Trimethylaluminum
    (Weinheim : Wiley-VCH, 2024) Jenderny, Jonathan; Boysen, Nils; Rubner, Jens; Zysk, Frederik; Preischel, Florian; Arcos, Teresa de los; Damerla, Varun Raj; Kostka, Aleksander; Franke, Jonas; Dahlmann, Rainer; Kühne, Thomas D.; Wessling, Matthias; Awakowicz, Peter; Devi, Anjana
    Vapor phase infiltration (VPI) has emerged as a promising tool for fabrication of novel hybrid materials. In the field of polymeric gas separation membranes, a beneficial impact on stability and membrane performance is known for several polymers with differing functional groups. This study for the first time investigates VPI of trimethylaluminum (TMA) into poly(1-trimethylsilyl-1-propyne) (PTMSP), featuring a carbon–carbon double bond as functional group. Saturation of the precursor inside the polymer is already attained after 60 s infiltration time leading to significant densification of the material. Depth profiling proves accumulation of aluminum in the polymer itself, but a significantly increased accumulation is visible in the gradient layer between polymer and SiO2 substrate. A reaction pathway is proposed and supplemented by density-functional theory (DFT) calculations. Infrared spectra derived from both experiments and simulation support the presented reaction pathway. In terms of permeance, a favorable impact on selectivity is observed for infiltration times up to 1 s. Longer infiltration times yield greatly reduced permeance values close or even below the detection limit of the measurement device. The present results of this study set a strong basis for the application of VPI on polymers for gas-barrier and membrane applications in the future.