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Molecular Dynamics of ULTEM 9085 for 3D Manufacturing: Spectra, Thermodynamic Properties, and Shear Viscosity.We present results of a molecular dynamic analysis of welding at the polymer-polymer interface. The analysis is performed for polyetherimide/ polycarbonate polymer blends. The work is motivated by the applications to 3D manufacturing in space. In the first part of the report, we discuss bulk and spectral characteristics of the amorphous polymer blends. The vibrational and infra-red spectra obtained using auto-correlation functions calculations in molecular dynamics are compared with the experimental spectra. The mechanical and thermal properties of the samples including heat capacity, bulk modulus, and thermal expansion coefficients are estimated and compared with experimental values. In the second part of the report, we discuss the result of molecular dynamical modeling of shear viscosity in a fully atomistic model of amorphous polymer blends with flat interface. The key result of the research is the demonstration of shear thinning behavior of the shear viscosity as a function of shear rate which is in good agreement with experimental data.
Document ID
20190026629
Document Type
Technical Memorandum (TM)
Authors
Luchinsky, Dmitry G. (Stinger Ghaffarian Technologies Inc. (SGT Inc.) Moffett Field, CA, United States)
Hafiychuk, Halina (Stinger Ghaffarian Technologies Inc. (SGT Inc.) Moffett Field, CA, United States)
Hafiychuk, Vasyl (Stinger Ghaffarian Technologies Inc. (SGT Inc.) Moffett Field, CA, United States)
Wheeler, Kevin R. (NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
June 25, 2019
Publication Date
December 1, 2018
Subject Category
Chemistry and Materials (General)
Report/Patent Number
NASA/TM-2018-220213
ARC-E-DAA-TN61894
L–12456
Funding Number(s)
WBS: 00370.04C.212.001
CONTRACT_GRANT: NNA14AA60C
Distribution Limits
Public
Copyright
Public Use Permitted.

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