1
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Duan S, Li Z, Liu Y, Zhao N, Li Z. Preparation of robust diphenyl silicone elastomers with enhanced mechanical properties and thermal-aging resistances by using phosphazene as catalyst. POLYMER 2023. [DOI: 10.1016/j.polymer.2023.125855] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/16/2023]
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2
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Preparation of degradable bio-based silicone/epoxy hybrid resins towards low dielectric composites. Eur Polym J 2022. [DOI: 10.1016/j.eurpolymj.2022.111691] [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]
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3
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Niu Z, Wu R, Huang L, Yang Y, Xia Z, Fan W, Sun W, Dai Q, He J, Bai C. A Poly(dimethyl-co-methylvinyl)siloxane-based elastomer with excellent ultra-low temperature elasticity driven by flexible alkyl branches. Eur Polym J 2022. [DOI: 10.1016/j.eurpolymj.2022.111303] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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4
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Fast synthesis of high molecular weights polydiethylsiloxanes and random poly(dimethylsiloxane-co- diethylsiloxane) copolysiloxanes via cyclic trimeric phosphazene base catalyzed ring-opening (co)polymerization. Eur Polym J 2022. [DOI: 10.1016/j.eurpolymj.2022.111280] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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5
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Ershova T, Anisimov A, Krylov F, Polshchikova N, Temnikov M, Shchegolikhina O, Muzafarov A. A new highly efficient method for the preparation of phenyl-containing siloxanes by condensation of phenylsilanols in liquid ammonia. Chem Eng Sci 2022. [DOI: 10.1016/j.ces.2021.116916] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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6
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Brounstein Z, Zhao J, Wheat J, Labouriau A. Tuning the 3D Printability and Thermomechanical Properties of Radiation Shields. Polymers (Basel) 2021; 13:3284. [PMID: 34641099 PMCID: PMC8512519 DOI: 10.3390/polym13193284] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2021] [Revised: 09/16/2021] [Accepted: 09/23/2021] [Indexed: 12/29/2022] Open
Abstract
Additive manufacturing, with its rapid advances in materials science, allows for researchers and companies to have the ability to create novel formulations and final parts that would have been difficult or near impossible to fabricate with traditional manufacturing methods. One such 3D printing technology, direct ink writing, is especially advantageous in fields requiring customizable parts with high amounts of functional fillers. Nuclear technology is a prime example of a field that necessitates new material design with regard to unique parts that also provide radiation shielding. Indeed, much effort has been focused on developing new rigid radiation shielding components, but DIW remains a less explored technology with a lot of potential for nuclear applications. In this study, DIW formulations that can behave as radiation shields were developed and were printed with varying amounts of porosity to tune the thermomechanical performance.
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Affiliation(s)
- Zachary Brounstein
- Los Alamos National Laboratory, Los Alamos, NM 87545, USA; (Z.B.); (J.Z.); (J.W.)
- Department of Nanoscience and Microsystems Engineering, University of New Mexico, Albuquerque, NM 87131, USA
| | - Jianchao Zhao
- Los Alamos National Laboratory, Los Alamos, NM 87545, USA; (Z.B.); (J.Z.); (J.W.)
- Department of Chemical Engineering, University of Michigan, Ann Arbor, MI 48109, USA
| | - Jeffrey Wheat
- Los Alamos National Laboratory, Los Alamos, NM 87545, USA; (Z.B.); (J.Z.); (J.W.)
| | - Andrea Labouriau
- Los Alamos National Laboratory, Los Alamos, NM 87545, USA; (Z.B.); (J.Z.); (J.W.)
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7
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Beach J, Mann S, Ault C, Radojcic D, Wan X, Zlatanic A, Patterson S, Messman JM, Dvornic PR. “ All-in-One” Thixotropic Polysiloxane Pastes for UV-Activated Room Temperature Hydrosilylation Cross-Linking in Additive Manufacturing. Macromolecules 2021. [DOI: 10.1021/acs.macromol.0c02457] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- James Beach
- Kansas Polymer Research Center, Pittsburg State University, Pittsburg, Kansas 66762, United States
| | - Shane Mann
- Kansas Polymer Research Center, Pittsburg State University, Pittsburg, Kansas 66762, United States
| | - Charles Ault
- Kansas Polymer Research Center, Pittsburg State University, Pittsburg, Kansas 66762, United States
| | - Dragana Radojcic
- Kansas Polymer Research Center, Pittsburg State University, Pittsburg, Kansas 66762, United States
| | - Xianmei Wan
- Kansas Polymer Research Center, Pittsburg State University, Pittsburg, Kansas 66762, United States
| | - Alisa Zlatanic
- Kansas Polymer Research Center, Pittsburg State University, Pittsburg, Kansas 66762, United States
| | - Steven Patterson
- Honeywell Federal Manufacturing & Technologies LLC, Kansas City, Missouri 64147, United States
| | - Jamie M. Messman
- Honeywell Federal Manufacturing & Technologies LLC, Kansas City, Missouri 64147, United States
| | - Petar R. Dvornic
- Department of Chemistry, Pittsburg State University, Pittsburg, Kansas 66762, United States
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8
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Ault CA, Beach J, Mann S, Wan X, Zlatanic A, Patterson S, Messman JM, Dvornic PR. Effect of Molecular Weight of Methylphenylsiloxy-Containing Vinyl-Functionalized Terpolysiloxanes on Their UV-Activated Crosslinking by Hydrosilylation and Mechanical Properties of Crosslinked Elastomers. Macromol Rapid Commun 2021; 42:e2000692. [PMID: 33502036 DOI: 10.1002/marc.202000692] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2020] [Revised: 12/16/2020] [Indexed: 11/09/2022]
Abstract
Effects of molecular weight of methylphenyl-containing vinylsiloxy-functionalized terpolysiloxanes on their UV-activated crosslinking by hydrosilylation at room temperature in air, shelf life stability of "all-in-one" pastes prepared from them for additive manufacturing, and mechanical properties of the resulting crosslinked elastomers, are investigated. It is found that while rheology of pastes containing base polymers, trimethylsilylated silica fillers, and thixotropic additives is not significantly affected by the base polymer molecular weight but is dominated by the filler concentration, the pastes based on higher molecular weight polymers exhibit faster crosslinking (corresponding to higher catalyst turnover numbers) and their crosslinked elastomers show transient strain-induced crystallization. The latter appears in networks from terpolymers with degrees of polymerization (DP) of 240 and above (corresponding to about one half of the critical polydimethylsiloxane chain length for entanglement formation of DP = 460), within the temperature range of -80 to -30 °C, characteristic for polydimethylsiloxane melting transition. It is believed that this is the first time an observation of this chain length effect is reported for polysiloxane elastomers and that the properties reported herein can be expected to have major implications on the application potential of these polymers in both additive manufacturing and performance of their elastomers at sub-ambient temperatures.
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Affiliation(s)
- Charles A Ault
- C. A. Ault, J. Beach, X. Wan, A. Zlatanic [+], Kansas Polymer Research Center, Pittsburg State University, Pittsburg, KS, 66762, USA
| | - James Beach
- C. A. Ault, J. Beach, X. Wan, A. Zlatanic [+], Kansas Polymer Research Center, Pittsburg State University, Pittsburg, KS, 66762, USA
| | - Shane Mann
- Department of Chemistry, Pittsburg State University, Pittsburg, KS, 66762, USA
| | - Xianmei Wan
- C. A. Ault, J. Beach, X. Wan, A. Zlatanic [+], Kansas Polymer Research Center, Pittsburg State University, Pittsburg, KS, 66762, USA
| | - Alisa Zlatanic
- C. A. Ault, J. Beach, X. Wan, A. Zlatanic [+], Kansas Polymer Research Center, Pittsburg State University, Pittsburg, KS, 66762, USA
| | - Steven Patterson
- Honeywell Federal Manufacturing and Technologies LLC, Kansas City, MO, 64147, USA
| | - Jamie M Messman
- Honeywell Federal Manufacturing and Technologies LLC, Kansas City, MO, 64147, USA
| | - Petar R Dvornic
- Department of Chemistry, Pittsburg State University, Pittsburg, KS, 66762, USA
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9
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Kawatsu T, Fuchise K, Takeuchi K, Choi JC, Sato K, Matsumoto K. Well-defined hydrogen and organofunctional polysiloxanes with spiro-fused siloxane backbones. Polym Chem 2021. [DOI: 10.1039/d0py01503b] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Structurally well-defined macrocyclic polysiloxanes with unique spirosiloxane units and regularly arranged Si–H groups were synthesized by B(C6F5)3-catalyzed dehydrocarbonative cross-couplings.
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Affiliation(s)
- Takahiro Kawatsu
- Interdisciplinary Research Center for Catalytic Chemistry (IRC3)
- National Institute of Advanced Industrial Science and Technology (AIST)
- Tsukuba
- Japan
| | - Keita Fuchise
- Interdisciplinary Research Center for Catalytic Chemistry (IRC3)
- National Institute of Advanced Industrial Science and Technology (AIST)
- Tsukuba
- Japan
| | - Katsuhiko Takeuchi
- Interdisciplinary Research Center for Catalytic Chemistry (IRC3)
- National Institute of Advanced Industrial Science and Technology (AIST)
- Tsukuba
- Japan
| | - Jun-Chul Choi
- Interdisciplinary Research Center for Catalytic Chemistry (IRC3)
- National Institute of Advanced Industrial Science and Technology (AIST)
- Tsukuba
- Japan
| | - Kazuhiko Sato
- Interdisciplinary Research Center for Catalytic Chemistry (IRC3)
- National Institute of Advanced Industrial Science and Technology (AIST)
- Tsukuba
- Japan
| | - Kazuhiro Matsumoto
- Interdisciplinary Research Center for Catalytic Chemistry (IRC3)
- National Institute of Advanced Industrial Science and Technology (AIST)
- Tsukuba
- Japan
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10
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Kawatsu T, Choi JC, Sato K, Matsumoto K. Facile Synthesis of Sequence-Defined Oligo(Dimethylsiloxane-co-Diphenylsiloxane)s. Macromol Rapid Commun 2020; 42:e2000593. [PMID: 33270333 DOI: 10.1002/marc.202000593] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2020] [Revised: 10/26/2020] [Indexed: 11/07/2022]
Abstract
1,1,3,3,5,5,7,7-Octamethyltetrasiloxane (H MD2 MH ), which is reported to release Me2 SiH2 via a B(C6 F5 )3 -catalyzed redistribution, acts as a good Me2 SiH2 precursor in the B(C6 F5 )3 -catalyzed dehydrocarbonative condensation of alkoxysilanes. A series of oligo(dimethylsiloxane-co-diphenylsiloxane)s that are uniformly sized and sequence-defined at the atomic level are synthesized by a one-pot controlled iteration of a B(C6 F5 )3 -catalyzed dehydrocarbonative condensation of alkoxysilanes with H MD2 MH or Ph2 SiH2 and a B(C6 F5 )3 -catalyzed hydrosilylation of carbonyl compounds, followed by the subsequent B(C6 F5 )3 -catalyzed dehydrogenative condensation of silanols.
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Affiliation(s)
- Takahiro Kawatsu
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8565, Japan
| | - Jun-Chul Choi
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8565, Japan
| | - Kazuhiko Sato
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8565, Japan
| | - Kazuhiro Matsumoto
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8565, Japan
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11
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Schneider AF, Lu EK, Lu G, Brook MA. Facile synthesis of phenyl‐rich functional siloxanes from simple silanes. JOURNAL OF POLYMER SCIENCE 2020. [DOI: 10.1002/pol.20200527] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Alyssa F. Schneider
- Department of Chemistry and Chemical Biology McMaster University Hamilton Ontario Canada
| | - Emily K. Lu
- Department of Chemistry and Chemical Biology McMaster University Hamilton Ontario Canada
| | - Guanhua Lu
- Department of Chemistry and Chemical Biology McMaster University Hamilton Ontario Canada
| | - Michael A. Brook
- Department of Chemistry and Chemical Biology McMaster University Hamilton Ontario Canada
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12
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Molecular Insights into Sequence Distributions and Conformation-Dependent Properties of High-Phenyl Polysiloxanes. Polymers (Basel) 2019; 11:polym11121989. [PMID: 31810258 PMCID: PMC6960887 DOI: 10.3390/polym11121989] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2019] [Revised: 11/23/2019] [Accepted: 11/24/2019] [Indexed: 11/17/2022] Open
Abstract
The excellent performance and wide applications of phenyl polysiloxanes are largely due to their phenyl units and monomer sequences. However, the relationship between molecular structure and material properties has not been explicitly elucidated. In this work, the sequence distribution and microstructure of random copolymers were quantitatively investigated by means of a molecular dynamics (MD) simulation combined with experimental verification. The results of 29Si NMR showed that the large number of phenyl units not only shortened the length of the dimethyl units, but also significantly increased the proportion of consecutive phenyl units. The simulation results indicated the attraction between adjacent phenyl groups that were effectively strengthened intra- and inter- molecular interactions, which determined the equilibrium population of conformations and the dynamics of conformational transitions. Furthermore, the evolution of bond angle distribution, torsion distribution, and mean-squared displacements (MSD) shed light on the conformational characteristics that induce the unique thermodynamics properties and photophysical behavior of high-phenyl polysiloxanes. Differential scanning calorimetry (DSC), dynamical mechanical analysis (DMA), spectrofluorimetry, and laser scanning confocal microscopy (LSCM) were performed to verify the conclusions drawn from the simulation. Overall, the complementary use of MD simulations and experiments provided a deep molecular insight into structure-property relationships, which will provide theoretical guidance for the rational design and preparation of high-performance siloxanes.
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13
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Sirrine JM, Zlatanic A, Meenakshisundaram V, Messman JM, Williams CB, Dvornic PR, Long TE. 3D Printing Amorphous Polysiloxane Terpolymers via Vat Photopolymerization. MACROMOL CHEM PHYS 2019. [DOI: 10.1002/macp.201800425] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Justin M. Sirrine
- Department of Chemistry Macromolecules Innovation Institute Virginia Tech Blacksburg VA 24061 USA
| | - Alisa Zlatanic
- Kansas Polymer Research Center Pittsburg State University Pittsburg KS 66762 USA
| | - Viswanath Meenakshisundaram
- Department of Mechanical Engineering Macromolecules Innovation Institute Virginia Tech Blacksburg VA 24061 USA
| | - Jamie M. Messman
- Honeywell Federal Manufacturing & Technologies LLC Kansas City MO 64147 USA
| | - Christopher B. Williams
- Department of Mechanical Engineering Macromolecules Innovation Institute Virginia Tech Blacksburg VA 24061 USA
| | - Petar R. Dvornic
- Department of Chemistry Pittsburg State University Pittsburg KS 66762 USA
| | - Timothy E. Long
- Department of Chemistry Macromolecules Innovation Institute Virginia Tech Blacksburg VA 24061 USA
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14
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Shi J, Zhao N, Xia S, Liu S, Li Z. Phosphazene superbase catalyzed ring-opening polymerization of cyclotetrasiloxane toward copolysiloxanes with high diphenyl siloxane content. Polym Chem 2019. [DOI: 10.1039/c9py00247b] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
PDMS-ran-PDPS copolysiloxanes with varying diphenyl siloxane contents (up to 64 mol%) are readily prepared by phosphazene catalyzed ROP.
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Affiliation(s)
- Jinfeng Shi
- Key Laboratory of Biobased Polymer Materials
- Shandong Provincial Education Department; College of Polymer Science and Engineering
- Qingdao University of Science and Technology
- Qingdao 266042
- China
| | - Na Zhao
- Key Laboratory of Biobased Polymer Materials
- Shandong Provincial Education Department; College of Polymer Science and Engineering
- Qingdao University of Science and Technology
- Qingdao 266042
- China
| | - Shuang Xia
- Institute of Chemical Materials
- China Academy of Engineering Physics
- Mianyang 621900
- China
| | - Shaofeng Liu
- Key Laboratory of Biobased Polymer Materials
- Shandong Provincial Education Department; College of Polymer Science and Engineering
- Qingdao University of Science and Technology
- Qingdao 266042
- China
| | - Zhibo Li
- Key Laboratory of Biobased Polymer Materials
- Shandong Provincial Education Department; College of Polymer Science and Engineering
- Qingdao University of Science and Technology
- Qingdao 266042
- China
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15
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Zlatanic A, Radojcic D, Wan X, Messman JM, Dvornic PR. Monitoring of the Course of the Silanolate-Initiated Polymerization of Cyclic Siloxanes. A Mechanism for the Copolymerization of Dimethyl and Diphenyl Monomers. Macromolecules 2018. [DOI: 10.1021/acs.macromol.7b02658] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | | | | | - Jamie M. Messman
- Honeywell Federal Manufacturing & Technologies LLC, Kansas City, Missouri 64147, United States
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