C. M. Roland
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View article: To the Reader
To the Reader Open
Man's Redemption of Man (New York: Paul B
View article: Structurally Related Scaling Behavior in Ionic Systems
Structurally Related Scaling Behavior in Ionic Systems Open
We examine the density scaling properties of two ionic materials, a classic aprotic low molecular weight ionic liquid, 1-butyl-3-methylimidazolium bis(perfluoroethylsulfonyl)imide ([BMIm][BETI]), and a polymeric ionic liquid, poly(3-methyl…
View article: Comment on “Experimental Evidence for a State-Point-Dependent Density-Scaling Exponent of Liquid Dynamics”
Comment on “Experimental Evidence for a State-Point-Dependent Density-Scaling Exponent of Liquid Dynamics” Open
Recently Sanz et al. [A. Sanz, T. Hecksher, H.W. Hansen, J.C. Dyre, K. Niss,\nand U.R. Pedersen, Phys. Rev. Lett. 122, 055501 (2019).] reported that the\nscaling exponent gamma for tetramethyl-tetraphenyl-trisiloxane (DC704) varied\nwith t…
View article: Chain Flexibility and the Segmental Dynamics of Polymers
Chain Flexibility and the Segmental Dynamics of Polymers Open
Using molecular dynamics simulations we examine the dynamics of a family of model polymers with varying chain length and torsional potential barriers. We focus on features of the dynamics of polymers that are seen experimentally but absent…
View article: SOLID PROPELLANTS
SOLID PROPELLANTS Open
Solid propellants are energetic materials used to launch and propel rockets and missiles. Although their history dates to the use of black powder more than two millennia ago, greater performance demands and the need for “insensitive muniti…
View article: Acoustic properties and density of polyurea at pressure up to 13.5 GPa through Brillouin scattering spectroscopy
Acoustic properties and density of polyurea at pressure up to 13.5 GPa through Brillouin scattering spectroscopy Open
Brillouin scattering was performed on an elastomeric polyurea, an important technological polymer. Being widely used for impact modification, of particular interest is its response to extreme pressure conditions. We applied pressures up to…
View article: A test for the existence of isomorphs in glass-forming materials
A test for the existence of isomorphs in glass-forming materials Open
We describe a method to determine whether a material has isomorphs in its thermodynamic phase diagram. Isomorphs are state points for which various properties are invariant in reduced units. Such materials are commonly identified from stro…
View article: Participation in the Johari–Goldstein Process: Molecular Liquids versus Polymers
Participation in the Johari–Goldstein Process: Molecular Liquids versus Polymers Open
We show using molecular dynamics simulations that simple diatomic molecules\nin the glassy state exhibit only limited participation in the Johari-Goldstein\n(JG) relaxation process. That is, with sufficient cooling local reorientations\nar…
View article: Short Time and Structural Dynamics in Polypropylene Glycol Nanocomposite
Short Time and Structural Dynamics in Polypropylene Glycol Nanocomposite Open
The dynamics of polypropylene glycol, both neat and attached to silica nanoparticles, were investigated using elastic neutron backscattering and dielectric spectroscopy. The mean square displacement measured by the former is suppressed by …
View article: Local and Global Dynamics in Polypropylene Glycol/Silica Composites
Local and Global Dynamics in Polypropylene Glycol/Silica Composites Open
The local segmental and global dynamics of a series of polypropylene glycol /\nsilica nanocomposites were studied using rheometry and mechanical and\ndielectric spectroscopies. The particles cause substantial changes in the\nrheology, incl…
View article: The “anomalous” dynamics of decahyroisoquinoline revisited
The “anomalous” dynamics of decahyroisoquinoline revisited Open
Decahydroisoquinoline (DHIQ) appears to be a unique material—the only non-associated, simple liquid with dynamics deviating from density scaling. To examine whether this anomaly is real, the density, ρ, of DHIQ was measured at temperatures…