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Khot A, Lindsey RK, Lewicki JP, Maiti A, Goldman N, Kroonblawd MP. United atom and coarse grained models for crosslinked polydimethylsiloxane with applications to the rheology of silicone fluids. Phys Chem Chem Phys 2023; 25:9669-9684. [PMID: 36943730 DOI: 10.1039/d2cp04920a] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/17/2023]
Abstract
Siloxane systems consisting primarily of polydimethylsiloxane (PDMS) are versatile, multifaceted materials that play a key role in diverse applications. However, open questions exist regarding the correlation between their varied atomic-level properties and observed macroscale features. To this effect, we have created a systematic workflow to determine coarse-grained simulation models for crosslinked PDMS in order to further elucidate the effects of network changes on the system's rheological properties below the gel point. Our approach leverages a fine-grained united atom model for linear PDMS, which we extend to include crosslinking terms, and applies iterative Boltzmann inversion to obtain a coarse-grain "bead-spring-type" model. We then perform extensive molecular dynamics simulations to explore the effect of crosslinking on the rheology of silicone fluids, where we compute systematic increases in both density and shear viscosity that compare favorably to experiments that we conduct here. The kinematic viscosity of partially crosslinked fluids follows an empirical linear relationship that is surprisingly consistent with Rouse theory, which was originally derived for systems comprised of a uniform distribution of linear chains. The models developed here serve to enable quantitative bottom-up predictions for curing- and age-induced effects on macroscale rheological properties, allowing for accurate prediction of material properties based on fundamental chemical data.
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Affiliation(s)
- Aditi Khot
- Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA.
- Department of Chemical Engineering, Purdue University, West Lafayette, Indiana 47907, USA
| | - Rebecca K Lindsey
- Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA.
- Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - James P Lewicki
- Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA.
| | - Amitesh Maiti
- Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA.
| | - Nir Goldman
- Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA.
- Department of Chemical Engineering, University of California, Davis, California 95616, USA
| | - Matthew P Kroonblawd
- Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA.
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Hu X, Yuan Q, Huang F, Liu Z, Li B. Preparation and ablative behaviors of carbon fiber‐reinforced polydimethylsiloxane‐
co
‐poly(silylene acetylenearyleneacetylene) composites. J Appl Polym Sci 2022. [DOI: 10.1002/app.53087] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Xueying Hu
- Key Laboratory for Specially Functional Materials and Related Technology of Ministry of Education, School of Materials Science & Engineering East China University of Science and Technology Shanghai China
| | - Qiaolong Yuan
- Key Laboratory for Specially Functional Materials and Related Technology of Ministry of Education, School of Materials Science & Engineering East China University of Science and Technology Shanghai China
| | - Farong Huang
- Key Laboratory for Specially Functional Materials and Related Technology of Ministry of Education, School of Materials Science & Engineering East China University of Science and Technology Shanghai China
| | - Zuozhen Liu
- Key Laboratory for Specially Functional Materials and Related Technology of Ministry of Education, School of Materials Science & Engineering East China University of Science and Technology Shanghai China
| | - Boqian Li
- Aerospace Research Institute of Materials and Processing Technology Beijing China
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