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Coarse-Grained and Atomistic Modeling of Polyimides (en Inglés)
Nasa Technical Reports Server (Ntrs)
(Autor)
·
Thomas C. Clancy
(Autor)
·
Jeffrey a. Hinkley
(Autor)
·
Bibliogov
· Tapa Blanda
Coarse-Grained and Atomistic Modeling of Polyimides (en Inglés) - Clancy, Thomas C. ; Hinkley, Jeffrey a. ; Nasa Technical Reports Server (Ntrs)
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Reseña del libro "Coarse-Grained and Atomistic Modeling of Polyimides (en Inglés)"
A coarse-grained model for a set of three polyimide isomers is developed. Each polyimide is comprised of BPDA (3,3,4,4' - biphenyltetracarboxylic dianhydride) and one of three APB isomers: 1,3-bis(4-aminophenoxy)benzene, 1,4-bis(4-aminophenoxy)benzene or 1,3-bis(3-aminophenoxy)benzene. The coarse-grained model is constructed as a series of linked vectors following the contour of the polymer backbone. Beads located at the midpoint of each vector define centers for long range interaction energy between monomer subunits. A bulk simulation of each coarse-grained polyimide model is performed with a dynamic Monte Carlo procedure. These coarsegrained models are then reverse-mapped to fully atomistic models. The coarse-grained models show the expected trends in decreasing chain dimensions with increasing meta linkage in the APB section of the repeat unit, although these differences were minor due to the relatively short chains simulated here. Considerable differences are seen among the dynamic Monte Carlo properties of the three polyimide isomers. Decreasing relaxation times are seen with increasing meta linkage in the APB section of the repeat unit.
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