The DX centre
T.N. Morgan
Semiconductor Science and Technology
Previous studies of solution properties of dialkyl-substituted polysilanes have been measured in good solvents where long-range excluded volume interactions are present. Comparison of the experimental data on the polymer dimensions with theoretical predictions requires dimensions unperturbed by these long-range interactions. The mixed solvent of 2-propanol and hexane (41.3 wt % iPrOH) is shown to be a macroscopic θ-solvent for poly(di-n-hexylsilane) at room temperature. Both the root-mean-square radius of gyration and the Stokes radius have been measured for a series of five molecular weights. The intrinsic viscosity in this mixed θ-solvent has also been determined for seven molecular weights. These direct measurements of unperturbed dimensions are compared with previous estimates obtained by extrapolation to low M where long-range excluded volume interactions are minimized. The ratio of the thermodynamic and hydrodynamic dimensions is compared with those reported for more flexible polymers. © 1994, American Chemical Society. All rights reserved.
T.N. Morgan
Semiconductor Science and Technology
Mark W. Dowley
Solid State Communications
Andreas C. Cangellaris, Karen M. Coperich, et al.
EMC 2001
Eloisa Bentivegna
Big Data 2022