The structure and dynamics of polystyrene (PS)-b-poly(ethylene oxide) block copolymers (BCPs) are studied. The BCPs exhibit microphase-separated cylindrical and lamellar morphologies. Structural dynamics are measured with X-ray photon correlation spectroscopy in the small-angle regime. Morphologies and domain sizes are evaluated using small-angle X-ray scattering (SAXS), scanning electron microscopy, and atomic force microscopy. Different solvent processing conditions are investigated. Grain sizes evaluated using SAXS are found to depend on processing only for the rubbery majority BCP. The structural relaxation times are examined as a function of PS volume fraction, temperature, morphology, and structural sizes.
Taleb, O., Patrick Blatt, M., Signorini, V., Oparaji, O., Kim, K., Lochner, E., et al. (2024). Dynamics of High Molecular Weight Cylindrical andLamellar Block Copolymers with X-ray Photon CorrelationSpectroscopy. MACROMOLECULAR CHEMISTRY AND PHYSICS, 225(5), 1-12 [10.1002/macp.202300357].
Dynamics of High Molecular Weight Cylindrical andLamellar Block Copolymers with X-ray Photon CorrelationSpectroscopy
Virginia SignoriniInvestigation
;
2024
Abstract
The structure and dynamics of polystyrene (PS)-b-poly(ethylene oxide) block copolymers (BCPs) are studied. The BCPs exhibit microphase-separated cylindrical and lamellar morphologies. Structural dynamics are measured with X-ray photon correlation spectroscopy in the small-angle regime. Morphologies and domain sizes are evaluated using small-angle X-ray scattering (SAXS), scanning electron microscopy, and atomic force microscopy. Different solvent processing conditions are investigated. Grain sizes evaluated using SAXS are found to depend on processing only for the rubbery majority BCP. The structural relaxation times are examined as a function of PS volume fraction, temperature, morphology, and structural sizes.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
