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Molecular dynamics simulations to compute the bulk response of amorphous PMMA

Sane, Sandeep B. and Çağin, Tahir and Knauss, Wolfgang G. and Goddard, William A., III (2001) Molecular dynamics simulations to compute the bulk response of amorphous PMMA. Journal of Computer-Aided Materials Design, 8 (2/3). pp. 87-106. ISSN 0928-1045. https://resolver.caltech.edu/CaltechAUTHORS:20190816-144341444

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Abstract

The results of molecular dynamics computations and corresponding values of laboratory measurements are compared to assess the efficacy of the numerical method. Details are presented on the modeling process, including the selection of an appropriate force field derived from separate computations on isotactic (crystalline) PMMA together with commensurate experimental data. It is found that in addition to typical energy minimization and temperature annealing cycles to establish equilibrium models, it is advantageous to also subject the model samples to a cycle of a relatively large pressure excursion (GPa's), to further improve the equilibrium state. Although the computations are limited to small samples in a physical sense (three polymer chains with fifty monomer units per chain per unit cell containing 2256 atoms), it appears that the primary limitation of the comparison with experimental data rests in the very short times (picoseconds). Estimates based on the time-temperature superposition principle do not overcome this difficulty, but may, on the other hand, signify limitations of the time-temperature trade-off as normally practiced.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1023/a:1020042716635DOIArticle
ORCID:
AuthorORCID
Çağin, Tahir0000-0002-3665-0932
Goddard, William A., III0000-0003-0097-5716
Additional Information:© Kluwer Academic Publishers 2001. Received 10 February 2001; Accepted 28 September 2001.
Group:GALCIT
Subject Keywords:Bulk Modulus; PMMA
Other Numbering System:
Other Numbering System NameOther Numbering System ID
WAG0480
Issue or Number:2/3
Record Number:CaltechAUTHORS:20190816-144341444
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20190816-144341444
Official Citation:Sane, S.B., Çağin, T., Knauss, W.G. et al. Journal of Computer-Aided Materials Design (2001) 8: 87. https://doi.org/10.1023/A:1020042716635
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:97976
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:21 Aug 2019 21:02
Last Modified:26 Oct 2019 00:35

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