Pressure effects on nanoscale domain evolution and hydration in dual functional bactericidal and antifouling polymer brush mixtures
Poly(2,2,3,3,4,4,5,5-(octafluoro) pentyl methacrylate) (POFPMA) represents a mechanically and thermally robust low-surface energy fluorinated polymer, rendering its applicability as barrier coatings for biomaterials very powerful due to its strong antifouling efficacy. Poly (2-(dimethylamino)ethyl methacrylate) (PDMAEMA) is a stimuli-dependent (pH, temperature) polymer with LCST behavior in water, similar to the well-investigated PNIPAm, but relatively less explored especially in a grafted brush architecture. PDMAEMA allows to enhance bactericidal properties in coatings upon quaternization. However, the role of water immersion and hydrostatic pressure (P) in nanoscale reorganization in thin (<1 żm thick) films of grafted brushes from such homopolymer mixtures at ambient temperature has so far remained elusive. Using GISANS at D22 from P=1 bar to P = 1000 bar (at ambient temperature), our goal is to probe the lateral brush nanoscale morphology (including the spatial distribution of D2O) on SiOx surfaces at a single 50% surface volume fraction of: (i) mixed homopolymer PDMAEMA/POFPMA as a model system of strong segregation; (ii) mixed PDMAEMA/PMMA as a weakly segregated system.
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Vagias, Apostolos; BUCHNER Andreas; GUTFREUND Philipp; KOSBAHN David and WOLF Marcell. (2023). Pressure effects on nanoscale domain evolution and hydration in dual functional bactericidal and antifouling polymer brush mixtures. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.EASY-1091
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