Spectra analysis for macromolecular systems: chain-length effects in polymer particles

Kazuhiko Fukui, Bobby G. Sumpter, Donald W. Noid, Chao Yang, Robert E. Tuzun

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

A complete set of frequencies for the density of states spectrum g(ω) is obtained for 6000-atom polymer particles involving all 18,000 degrees of freedom. We efficiently generate the particle using molecular dynamics and molecular mechanics, and systematically analyze the spectra and thermal properties as a function of chain lengths: from one to 100 monomers. The density of states spectrum g(ω) shows a higher number of low-frequency modes for the polymer particle with a smaller chain length, which results in a higher heat capacity at low temperature. Gibbs free energy was also calculated for the formation of a particle from a crystal as a function of temperature to evaluate thermal stability of those systems.

Original languageEnglish
Pages (from-to)1812-1823
Number of pages12
JournalJournal of Polymer Science, Part B: Polymer Physics
Volume38
Issue number13
DOIs
StatePublished - Jul 1 2000

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