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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] [What about the content of this article? (0)] [Affiliation(s)] [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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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] [What about the content of this article? (0)] [Affiliation(s)] [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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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] [What about the content of this article? (0)] [Affiliation(s)] [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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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] [What about the content of this article? (0)] [Affiliation(s)] [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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Zlatanic A, Radojcic D, Wan X, Messman JM, Dvornic PR. Suppression of Crystallization in Polydimethylsiloxanes and Chain Branching in Their Phenyl-Containing Copolymers. Macromolecules 2017. [DOI: 10.1021/acs.macromol.7b00474] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | | | | | - Jamie M. Messman
- Honeywell Federal Manufacturing & Technologies LLC, Kansas City, Missouri 64147, United States
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Brooker NL, Lagalle CD, Zlatanic A, Javni I, Petrovic Z. Soy polyol formulations as novel seed treatments for the management of soil-borne diseases of soybean. Commun Agric Appl Biol Sci 2007; 72:35-43. [PMID: 18399422] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Polyurethanes prepared from vegetable oils display a number of desirable properties useful for many commercial and industrial applications. One unique application is that of an agricultural seed treatment. Seed treatments are used to incorporate pesticides onto the seed coat and to decrease the disease susceptibility of the seed during its germination in the soil. In addition, by altering the movement of water across the seed coat and by incorporating protective pesticides in the coating, seed coating polymers can enhance the germination and survival of the seed under adverse environmental conditions. Soy polyols alone, and in combination with glycerin, polymerized with 4,4'-diphenylmethane diisocyanate (MDI) were studied for their seed treating properties and impact on soybean seed germination. The cross-linking density and properties of these polyurethane compounds were varied by changing the isocyanate/hydroxyl molar ratios. In order to optimize the coating qualities and to increase the efficiency of the coating, acetone was also studied as a diluting solvent to reduce the viscosity of the polyurethane mixture prior to polymerization on the seed coat. Optimal polymerization and resulting germination (95%) were obtained using a 1:1 isocyanate/hydroxyl molar ratio consisting of a mixture of soy polyol 180 and glycerin, and the use of an equal volume of acetone as a dilution solvent. This optimal polyurethane seed treatment had several desirable qualities including: reduced viscosity, decreased seed coating thickness, increased seed coating uniformity and permitted larger volumes of seed to be treated with the same volume of polymer. This optimal seed treatment increased the soybean seed germination by 15%, as compared with untreated seed. In addition, preliminary studies of the compatibility of these unique formulations with commercial and experimental fungicides also support the use of these polymers as seed treatments due to their enhanced stability, longevity and slow active ingredient water teaching characteristics. Compatibility of these seed coating polymers as formulations with captan, metalaxyl, thiabendazole and novel antimicrobial lipids and triterpenoid compounds display that the active ingredients can readily provide a zone of fungal inhibition around the seed as it germinates in the presence of Macrophomina phaseolino, causal agent of charcoal rot of soybeans. However, the release of the active ingredient from the polyol seed treatments is less affected by water leaching as compared to commercially available water-soluble seed treating polymer formulations. This is most likely due to the polyols unique polymer cross-linking characteristics. These results support the continued exploration of soy polyol derived polymers as seed coating compounds.
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Affiliation(s)
- N L Brooker
- Department of Biology, Pittsburg State University, 1701 South Broadway, Pittsburg, Kansas 66762, USA
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Markovic S, Dunjic B, Zlatanic A, Djonlagic J. Dynamic mechanical analysis study of the curing of phenol-formaldehyde novolac resins. J Appl Polym Sci 2001. [DOI: 10.1002/app.1623] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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