These observations are qualitatively consistent with the interpretation of recent X-ray photon correlation spectroscopy on supported star polymer films. 1 The core, or the center, of the polymer can be an atom, molecule, or macromolecule the chains, or 'arms', consist of variable-length organic chains. Materials Science and Engineering Division, National Institute of. Star-shaped polymers are the simplest class of branched polymers with a general structure consisting of several (at least three) linear chains connected to a central core. In particular, the width of the substrate interfacial layer grows with increasing f, saturating in value around f = 12, while the width of the interfacial zone near the “free” boundary, where the polymer dynamics is greatly accelerated compared to the film interior, is less influenced by changes in polymer topology. Self-assembly of polymer-grafted nanoparticles in solvent-free conditions. Anthony Chieco,, University of Pennsylvania Alexandros Chremos,, NIST Autumn Cook,. The mobility gradients in the film, quantified by the relaxation time obtained from the intermediate scattering function on a layer-by-layer basis, are also significantly altered by f. The Concentration Dependence of the Size and Symmetry of a Bottlebrush Polymer in a Good Solvent. In particular, we observe a general slowing down in the rate of relaxation of the entire film with an increasing functionality f, a general trend attributed mainly to an alteration of the effective cohesive interaction strength when f is increased. While the spatial variation of segmental density profile is only weakly dependent on star polymer topology, the polymer topology significantly affects both the average rate of relaxation and the spatial variation of the average segmental relaxation time τ α as a function of depth from the film substrate, z. Douglas, A comparative study of thermodynamic, conformational, and structural properties of bottlebrush with star and ring polymer melts, The Journal of Chemical Physics, 10.1063/1.5034794, 149, 4, (044904), (2018). These are possibly similar items as determined by title/reference text matching only.We simulate the structure and dynamics of star polymer films of varying arm mass M a and number of star arms f on a supporting solid substrate with an attractive interaction and compare to the corresponding properties of thin films of linear polymers. E-mail:, Abstract We explore the monovalent counter-ion distribution around flexible highly-charged polyelectrolytes with different molecular architectures (linear chains, stars, and unknotted and trefoil rings) using molecular dynamics simulations that include an explicit solvent that interacts. 12316-12325 doi:10.1021/jp903820dĪmerican Chemical Society (ACS) (2009, September) The Journal of Physical Chemistry B Vol. There has been significant interest in the tendency of highly charged particles having the same charge to form dynamic clusters in solution, but an accepted. The Journal of Physical Chemistry B, 113 (36). Vasiliki Falara, H B Wilson, and two other persons are also associated with this address. (2009) Crystal Structures of Two-Dimensional Binary Mixtures of Dipolar Colloids in Tilted External Magnetic Fields. Alexandros is a resident of 305 Ashley Rd, Newark, DE. Search inside The Journal of Physical Chemistry B only Reference TypeĬrystal Structures of Two-Dimensional Binary Mixtures of Dipolar Colloids in Tilted External Magnetic Fieldsĭoi:10.1021/jp903820d Search in ResearchGateĬhremos, Alexandros, Likos, Christos N.

Alexandros chremos