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Cao Q, Weng Z, Qi Y, Li J, Liu W, Liu C, Zhang S, Wei Z, Chen Y, Jian X. Achieving higher performances without an external curing agent in natural magnolol-based epoxy resin. CHINESE CHEM LETT 2022. [DOI: 10.1016/j.cclet.2021.09.025] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Kamitani T, Imoto H, Naka K. Soluble and processable thermoplastic hybrid polyimides containing POSS in main chains. Polym Chem 2022. [DOI: 10.1039/d2py00980c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The combination of 3,13-bis(3-aminopropyl)-double-decker-shaped-silsesquioxane and a fluorinated dianhydride produces a flexible polyimide with a low Tg, high heat resistance, and excellent solvent solubility. The fluorinated dianhydride loosened the interchain packing to suppress CT interactions, leading to the formation of a colorless polyimide.
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Affiliation(s)
- Tasuku Kamitani
- Faculty of Molecular Chemistry and Engineering, Kyoto Institute of Technology, Goshokaido-cho, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan
| | - Hiroaki Imoto
- Faculty of Molecular Chemistry and Engineering, Kyoto Institute of Technology, Goshokaido-cho, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan
| | - Kensuke Naka
- Faculty of Molecular Chemistry and Engineering, Kyoto Institute of Technology, Goshokaido-cho, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan
- Materials Innovation Lab, Kyoto Institute of Technology, Goshokaido-cho, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan
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Xu X, Liu Y, Lan B, Mo S, Zhai L, He M, Fan L. High Thermally Stable and Melt Processable Polyimide Resins Based on Phenylethynyl-Terminated Oligoimides Containing Siloxane Structure. MATERIALS 2020; 13:ma13173742. [PMID: 32847085 PMCID: PMC7503409 DOI: 10.3390/ma13173742] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/01/2020] [Revised: 08/18/2020] [Accepted: 08/20/2020] [Indexed: 11/21/2022]
Abstract
A series of 4-phenylethnylphthalic anhydride (PEPA)-terminated oligoimides were prepared by co-oligomerizing isomeric dianhydrides, i.e., 2,3,3′,4′-biphenyltetracarboxylic dianhydride (a-BPDA), 2,3,3′,4′-benzophenonetetracarboxylic dianhydride (a-BTDA) or 2,3,3′,4′-diphenylethertetracarboxylic dianhydride (a-ODPA), with diamines mixture of bis(4-aminophenoxy)dimethyl silane (APDS) and 2,2′-bis(trifluoromethyl) benzidine (TFDB). The effects of siloxane content and dianhydride structure on the rheological properties of these oligoimides and thermal stability of the corresponding cured polyimide resins were investigated. The results indicated that the introduction of the siloxane structure improved the melt processability of the oligoimides, while the thermal stability of the cured polyimide resins reduced. The oligoimide derived from a-ODPA revealed better melt processability and melt stability due to the existence of a flexible dianhydride structure. The oligoimide PIS-O10 derived from a-ODPA gave the lowest minimum melt viscosity of 0.09 Pa·s at 333 °C and showed the excellent melt stability at 260 °C for 2 h with the melt viscosity in the range of 0.69–1.63 Pa·s. It is also noted that the thermal stability of these resins can be further enhanced by postcuring at 400–450 °C, which is attributed to the almost complete chemical crosslinking of the phenyethynyl combined with oxidative crosslinking of siloxane. The PIS-T10 and PIS-O10 resins that were based on a-BTDA and a-ODPA, respectively, even showed a glass transition temperature over 550 °C after postcuring at 450 °C for 1 h.
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Affiliation(s)
- Xiaozhou Xu
- Key Laboratory of Science and Technology on High-Tech Polymer Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China; (X.X.); (Y.L.); (B.L.); (S.M.); (L.Z.); (M.H.)
- School of Chemical Science, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yi Liu
- Key Laboratory of Science and Technology on High-Tech Polymer Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China; (X.X.); (Y.L.); (B.L.); (S.M.); (L.Z.); (M.H.)
| | - Bangwei Lan
- Key Laboratory of Science and Technology on High-Tech Polymer Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China; (X.X.); (Y.L.); (B.L.); (S.M.); (L.Z.); (M.H.)
- School of Chemical Science, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Song Mo
- Key Laboratory of Science and Technology on High-Tech Polymer Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China; (X.X.); (Y.L.); (B.L.); (S.M.); (L.Z.); (M.H.)
| | - Lei Zhai
- Key Laboratory of Science and Technology on High-Tech Polymer Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China; (X.X.); (Y.L.); (B.L.); (S.M.); (L.Z.); (M.H.)
| | - Minhui He
- Key Laboratory of Science and Technology on High-Tech Polymer Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China; (X.X.); (Y.L.); (B.L.); (S.M.); (L.Z.); (M.H.)
| | - Lin Fan
- Key Laboratory of Science and Technology on High-Tech Polymer Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China; (X.X.); (Y.L.); (B.L.); (S.M.); (L.Z.); (M.H.)
- School of Chemical Science, University of Chinese Academy of Sciences, Beijing 100049, China
- Correspondence: ; Tel.: +86-010-6256-4819
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La Scala JJ, Yandek G, Lamb J, Paquette CM, Eck WS, Adams V, Lastovickova D, Sadler JM. The effect of methyl and methoxy substituents on dianilines for a thermosetting polyimide system. HIGH PERFORM POLYM 2020. [DOI: 10.1177/0954008319899141] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
4,4′-Methylenedianiline (MDA) is widely used in high-temperature polyimide resins, including polymerization of monomer reactants-15. The toxicity of MDA significantly limits the manufacturability using this resin. Modifying the substitution and electronics of MDA could allow for the reduction of toxicity while maintaining the high-performing properties of the materials derived from the modified MDA. The addition of a single methyl substituent, methoxy substituent, location of these substituents, and location of the amine relative to the phenolic bridge were modified as were other non-aniline diamines. Various anilines were condensed with paraformaldehyde under acidic conditions to yield dianilines. These dianilines and diamines were reacted with nadic anhydride and 3,3′,4,4′-benzophenonetetracarboxylic dianhydride in methanol to form the polyamic acid oligomers and heated at elevated temperature to form polyimide oligomers. It was found that the molecular weight of the oligomers derived from MDA alternatives was generally lower than that of MDA oligomers resulting in lower glass transition temperatures ( T gs) and degradation temperatures. Additionally, methoxy substituents further reduce the T g of the polymers versus methyl substituents and reduce the thermal stability of the resin. Methyl-substituted alternatives produced polyimides with similar T gs and degradation temperatures. The toxicity of the MDA alternatives was examined. Although a few were identified with reduced toxicities, the alternatives with properties similar to that of MDA also had high toxicities.
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Affiliation(s)
- John J La Scala
- CCDC Army Research Laboratory, FCDD-RLW-M, Aberdeen Proving Ground, MD, USA
| | - Greg Yandek
- Air Force Research Laboratory, Edwards AFB, CA, USA
| | - Jason Lamb
- Air Force Research Laboratory, Edwards AFB, CA, USA
| | | | - William S Eck
- Army Public Health Center, Aberdeen Proving Ground, MD, USA
| | - Valerie Adams
- Army Public Health Center, Aberdeen Proving Ground, MD, USA
| | | | - Joshua M Sadler
- CCDC Army Research Laboratory, FCDD-RLW-M, Aberdeen Proving Ground, MD, USA
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Bassett AW, Cosgrove JD, Schmalbach KM, Stecca OM, Paquette CM, Adams VH, Eck WS, Sadler JM, La Scala JJ, Stanzione JF. Alternative monomers for 4,4′‐methylenedianiline in thermosetting epoxy resins. J Appl Polym Sci 2019. [DOI: 10.1002/app.48707] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Alexander W. Bassett
- Department of Chemical Engineering Rowan University, 201 Mullica Hill Road Glassboro New Jersey 08028
| | - Jayson D. Cosgrove
- Department of Chemical Engineering Rowan University, 201 Mullica Hill Road Glassboro New Jersey 08028
| | - Kevin M. Schmalbach
- Department of Chemical Engineering Rowan University, 201 Mullica Hill Road Glassboro New Jersey 08028
| | - Owen M. Stecca
- Department of Chemical Engineering Rowan University, 201 Mullica Hill Road Glassboro New Jersey 08028
| | - Craig M. Paquette
- Combat Capabilities Development Command Army Research Laboratory, 4600 Deer Creek Loop Aberdeen Proving Ground Maryland 21005
| | - Valerie H. Adams
- Toxicology Directorate U.S. Army Public Health Center, 8252 Blackhawk Road Aberdeen Proving Ground Maryland 21010
| | - William S. Eck
- Toxicology Directorate U.S. Army Public Health Center, 8252 Blackhawk Road Aberdeen Proving Ground Maryland 21010
| | - Joshua M. Sadler
- Combat Capabilities Development Command Army Research Laboratory, 4600 Deer Creek Loop Aberdeen Proving Ground Maryland 21005
| | - John J. La Scala
- Combat Capabilities Development Command Army Research Laboratory, 4600 Deer Creek Loop Aberdeen Proving Ground Maryland 21005
| | - Joseph F. Stanzione
- Department of Chemical Engineering Rowan University, 201 Mullica Hill Road Glassboro New Jersey 08028
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Zhang Y, Miyauchi M, Nutt S. Structure and properties of a phenylethynyl-terminated PMDA-type asymmetric polyimide. HIGH PERFORM POLYM 2018. [DOI: 10.1177/0954008318762592] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
A new polymerized monomeric reactant (PMR)-type polyimide, designated TriA X, was investigated to determine polymer structure, processability, thermal, and mechanical properties and establish the relationship between the molecular structure and those properties. TriA X is a PMR-type polyimide with an asymmetric, irregular, and nonplanar backbone. Both the imide oligomers and the cross-linked polyimides of TriA X exhibited loose-packed amorphous structures, independent of thermal processing. The peculiar structures were attributed to the asymmetric backbone, which effectively prevented the formation of closed-packed chain stacking typically observed in polyimides. The imide oligomers exhibited a lower melt viscosity than a control imide oligomer (symmetric and semi-crystalline), indicating a higher chain mobility above the glass transition temperature ( Tg). The cured polyimide exhibited a Tg = 362°C and a decomposition temperature = 550°C. The cross-linked TriA X exhibited exceptional toughness and ductility (e.g. 15.1% at 23°C) for a polyimide, which was attributed to the high-molecular-weight oligomer and loose-packed amorphous structure. The thermal and mechanical properties of TriA X surpass those of PMR-15 and AFR-PE-4.
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Affiliation(s)
- Yixiang Zhang
- Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, CA, USA
| | - Masahiko Miyauchi
- Kaneka U.S. Material Research Center, Kaneka Americas Holding, College Station, TX, USA
| | - Steven Nutt
- Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, CA, USA
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