Molecular dynamics modeling of PPTA crystallite mechanical properties in the presence of defects
Abstract
Here, the mechanical properties of PPTA crystallites, the fundamental building blocks of aramid polymer fibers such as Kevlar® and Twaron®, are studied here using molecular dynamics simulations. The ReaxFF interatomic potential is employed to study crystallite failure via covalent and hydrogen bond rupture in constant strain-rate tensile loading simulations. Emphasis is placed on analyzing how chain-end defects in the crystallite influence its mechanical response and fracture strength. Chain-end defects are found to affect the behavior of nearby chains in a region of the PPTA crystallite that is small relative to the typical crystallite size in manufactured aramid fibers. The central Csingle bondN bond along the backbone chain is identified as the weakest in the PPTA polymer chain backbone in dynamic strain-to-failure simulations of the crystallite. It is found that clustering of chain-ends leads to reduced crystallite strength and crystallite failure via hydrogen bond rupture and chain sliding, whereas randomly scattered defects impact the strength less and failure is by covalent bond rupture and chain scission. The axial crystallite modulus increases with increasing chain length and is independent of chain-end defect locations. On the basis of these findings, a theoretical model is proposed to predict the axial modulus as a functionmore »
- Authors:
-
- Univ. of California, Berkeley, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Univ. of California, Berkeley, CA (United States)
- Publication Date:
- Research Org.:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1351138
- Alternate Identifier(s):
- OSTI ID: 1396502
- Report Number(s):
- LLNL-JRNL-717003
Journal ID: ISSN 0032-3861
- Grant/Contract Number:
- AC52-07NA27344
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Polymer
- Additional Journal Information:
- Journal Volume: 114; Journal Issue: C; Journal ID: ISSN 0032-3861
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 42 ENGINEERING; 36 MATERIALS SCIENCE; Kevlar®; Aramid fibers; elastic modulus; defects; molecular dynamics; reactive potentials
Citation Formats
Mercer, Brian, Zywicz, Edward, and Papadopoulos, Panayiotis. Molecular dynamics modeling of PPTA crystallite mechanical properties in the presence of defects. United States: N. p., 2017.
Web. doi:10.1016/j.polymer.2017.03.012.
Mercer, Brian, Zywicz, Edward, & Papadopoulos, Panayiotis. Molecular dynamics modeling of PPTA crystallite mechanical properties in the presence of defects. United States. https://doi.org/10.1016/j.polymer.2017.03.012
Mercer, Brian, Zywicz, Edward, and Papadopoulos, Panayiotis. Sat .
"Molecular dynamics modeling of PPTA crystallite mechanical properties in the presence of defects". United States. https://doi.org/10.1016/j.polymer.2017.03.012. https://www.osti.gov/servlets/purl/1351138.
@article{osti_1351138,
title = {Molecular dynamics modeling of PPTA crystallite mechanical properties in the presence of defects},
author = {Mercer, Brian and Zywicz, Edward and Papadopoulos, Panayiotis},
abstractNote = {Here, the mechanical properties of PPTA crystallites, the fundamental building blocks of aramid polymer fibers such as Kevlar® and Twaron®, are studied here using molecular dynamics simulations. The ReaxFF interatomic potential is employed to study crystallite failure via covalent and hydrogen bond rupture in constant strain-rate tensile loading simulations. Emphasis is placed on analyzing how chain-end defects in the crystallite influence its mechanical response and fracture strength. Chain-end defects are found to affect the behavior of nearby chains in a region of the PPTA crystallite that is small relative to the typical crystallite size in manufactured aramid fibers. The central Csingle bondN bond along the backbone chain is identified as the weakest in the PPTA polymer chain backbone in dynamic strain-to-failure simulations of the crystallite. It is found that clustering of chain-ends leads to reduced crystallite strength and crystallite failure via hydrogen bond rupture and chain sliding, whereas randomly scattered defects impact the strength less and failure is by covalent bond rupture and chain scission. The axial crystallite modulus increases with increasing chain length and is independent of chain-end defect locations. On the basis of these findings, a theoretical model is proposed to predict the axial modulus as a function of chain length.},
doi = {10.1016/j.polymer.2017.03.012},
journal = {Polymer},
number = C,
volume = 114,
place = {United States},
year = {Sat Mar 11 00:00:00 EST 2017},
month = {Sat Mar 11 00:00:00 EST 2017}
}
Web of Science
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Works referencing / citing this record:
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