ISSN:
0887-6266
Schlagwort(e):
poly[1-(trimethylsilyl)-1-propyne]
;
Monte Carlo simulation
;
diffusion coefficient
;
molecular dynamics
;
gas solubility
;
Physics
;
Polymer and Materials Science
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
,
Physik
Notizen:
The bonded constants in the DREIDING force field have been parameterized for poly[1-(trimethylsilyl)-1-propyne] (PTMSP) from AM1 calculations of the dimer. The resultant force field has been validated through the simulation of amorphous cell density and x-ray data (d-spacing) and used to obtain diffusion coefficients for five gases (He, O2, N2, CH4, and CO2) from 0.5 ns NVT molecular dynamics using the Einstein relationship. In addition, solubility coefficients of these gases have been obtained from the particle insertion method of Bezus et al. and from a fixed-pressure Monte Carlo method which was also used to calculate sorption isotherms. In general, there is good to excellent agreement between experimental and simulated values of the diffusion and solubility coefficients for He, O2, N2, and CH4. Sorption isotherms and dual-mode parameters calculated from the simulation results for O2, N2, and CH4 agree very favorably with experimental data (no experimental data was available for He). In the case of CO2, diffusion and solubility coefficients as well as sorption isotherms are underestimated. The less satisfactory results for CO2 have been tentatively attributed to inadequacy of the generic nonbonded Lennard-Jones potential terms of DREIDING used in this study. © 1998 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 36: 519-536, 1998
Zusätzliches Material:
19 Ill.
Materialart:
Digitale Medien
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