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Title: Studying the effect of phenyl group content on the physical properties of un-crosslinked PDMS (Progress Summary)

Abstract

Over the last couple of years, the emphasis on our A&L efforts has been on developing a thermal-age-aware constitutive model for foam cushions. From our studies so far, it appears that an $N = 2$ Ogden hyperfoam model within the framework of a two-network Tobolsky scheme is appropriate to describe the age-aware stress-strain response of both stochastic and additively manufactured (AM) foams. The models have so far been fitted only to a limited number of silicone-based materials systems, i.e., M97 and M9763 stochastic foams and AM foams made of SE1700 rubber. As we explore new and different rubber formulations for improved structural as well as A&L properties, we find it important to develop a deeper understanding of the effect of functional groups on the physical, mechanical, and flow properties of the constituent elastomer. To this end, in Q2 FY19, we have begun a project on multiscale modeling of polymers that realistically incorporates from bond-level dynamics to terminal dynamics of whole chains (e.g., tube dynamics). In such mesoscale simulations the polymer tube dynamics is modeled through coarse-graining of monomers to mesoscale “beads”, with the bead-bead potential being systematically fitted to accurate atomic-level forcefields. The aim of this collaboration is to developmore » a fully physical constitutive model that predicts the mechanical response of polymers of our interest based on structure and modeled dynamics alone.« less

Authors:
 [1];  [2];  [2]
  1. Univ. of Connecticut, Storrs, CT (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1544488
Report Number(s):
LLNL-TR-782121
977085
DOE Contract Number:  
AC52-07NA27344
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Li, Y., Maiti, A., and Saab, A. P. Studying the effect of phenyl group content on the physical properties of un-crosslinked PDMS (Progress Summary). United States: N. p., 2019. Web. doi:10.2172/1544488.
Li, Y., Maiti, A., & Saab, A. P. Studying the effect of phenyl group content on the physical properties of un-crosslinked PDMS (Progress Summary). United States. doi:10.2172/1544488.
Li, Y., Maiti, A., and Saab, A. P. Mon . "Studying the effect of phenyl group content on the physical properties of un-crosslinked PDMS (Progress Summary)". United States. doi:10.2172/1544488. https://www.osti.gov/servlets/purl/1544488.
@article{osti_1544488,
title = {Studying the effect of phenyl group content on the physical properties of un-crosslinked PDMS (Progress Summary)},
author = {Li, Y. and Maiti, A. and Saab, A. P.},
abstractNote = {Over the last couple of years, the emphasis on our A&L efforts has been on developing a thermal-age-aware constitutive model for foam cushions. From our studies so far, it appears that an $N = 2$ Ogden hyperfoam model within the framework of a two-network Tobolsky scheme is appropriate to describe the age-aware stress-strain response of both stochastic and additively manufactured (AM) foams. The models have so far been fitted only to a limited number of silicone-based materials systems, i.e., M97 and M9763 stochastic foams and AM foams made of SE1700 rubber. As we explore new and different rubber formulations for improved structural as well as A&L properties, we find it important to develop a deeper understanding of the effect of functional groups on the physical, mechanical, and flow properties of the constituent elastomer. To this end, in Q2 FY19, we have begun a project on multiscale modeling of polymers that realistically incorporates from bond-level dynamics to terminal dynamics of whole chains (e.g., tube dynamics). In such mesoscale simulations the polymer tube dynamics is modeled through coarse-graining of monomers to mesoscale “beads”, with the bead-bead potential being systematically fitted to accurate atomic-level forcefields. The aim of this collaboration is to develop a fully physical constitutive model that predicts the mechanical response of polymers of our interest based on structure and modeled dynamics alone.},
doi = {10.2172/1544488},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {7}
}