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Vogel W, Hegde M, Keith AN, Sheiko SS, Dingemans TJ. Chemistry and Properties of Cross-Linked All-Aromatic Hyperbranched Polyaryletherketones. Macromolecules 2021. [DOI: 10.1021/acs.macromol.1c01998] [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]
Affiliation(s)
- Wouter Vogel
- Faculty of Aerospace Engineering, Delft University of Technology, Kluyverweg 1, Delft 2629 HS, The Netherlands
- Dutch Polymer Institute (DPI), P.O. Box 902, Eindhoven 5600 AX, The Netherlands
| | - Maruti Hegde
- Department of Applied Physical Sciences, University of North Carolina at Chapel Hill, Murray Hall 1113, 121 South Road, Chapel Hill, North Carolina 27599-3050, United States
| | - Andrew N. Keith
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, United States
| | - Sergei S. Sheiko
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, United States
| | - Theo J. Dingemans
- Faculty of Aerospace Engineering, Delft University of Technology, Kluyverweg 1, Delft 2629 HS, The Netherlands
- Department of Applied Physical Sciences, University of North Carolina at Chapel Hill, Murray Hall 1113, 121 South Road, Chapel Hill, North Carolina 27599-3050, United States
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Wang W, Chen G, Fang X. Phenylethynyl-terminated oligoimides with ultra-low melt viscosity derived from 1,4-bis(3,4-dicarboxy phenoxy)benzene dianhydride. HIGH PERFORM POLYM 2019. [DOI: 10.1177/0954008319832347] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Most of the existing polyimide oligomers for resin transfer molding (RTM) processing exhibited high melt viscosity, which can only maintain below 1 Pa·s at 280°C for 2 h, leading to very high process temperatures. So novel RTM-type oligomers with lower and stable melt viscosities are more desirable. Three series of thermoset oligoimides derived from 1,4-bis(3,4-dicarboxy phenoxy)benzene dianhydride and three different aromatic diamines were prepared herein. The diamines included 4,4′-oxydianiline, 2,2′-bis(trifluoromethyl)benzidine (TFDB), and 2-phenyl-4,4′-diaminodiphenyl ether ( p-ODA). 4-Phenylethynylphthalic anhydride was used as an endcapping reagent. Effects of the chemical structures and molecular weights of the oligoimides on their aggregated structures, melt processability, and the thermal and mechanical properties of the cured films were then systematically investigated. X-Ray diffraction results indicated that ODA series oligoimides and TFDB series oligoimides showed crystallinity in various degrees. However, the asymmetric p-ODA enables the p-ODA series oligoimides to exhibit amorphous forms. It was found that the p-ODA-based oligoimide with a molecular weight of 750 g mol−1 showed very low melt viscosity of 1 Pa·s even at 210°C, and the melt viscosity could maintain below 1 Pa·s after isothermal aging for 2 h at any temperature in the range of 200–280°C by rheological measurements. The cured film also showed a high glass transition temperature of 355°C by dynamic mechanical analysis, very good thermal stability by thermogravimetric analysis, and good mechanical properties. It might be more suitable for RTM processes in the future.
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Affiliation(s)
- Wei Wang
- Laboratory of Polymer Materials and Engineering, Ningbo Institute of Technology, Zhejiang University, Ningbo, China
| | - Guofei Chen
- Key Laboratory of Additive Manufacturing Materials of Zhejiang Province, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, China
| | - Xingzhong Fang
- Key Laboratory of Additive Manufacturing Materials of Zhejiang Province, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, China
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Wang W, Chen G, Fang X. 1,4‐Bis(2,3‐dicarboxyl‐phenoxy)benzene dianhydride‐based phenylethynyl terminated thermoset oligoimides for resin transfer molding applications. J Appl Polym Sci 2019. [DOI: 10.1002/app.47967] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Wei Wang
- Laboratory of Polymer Materials and EngineeringNingbo Institute of Technology, Zhejiang University Ningbo 315100 China
| | - Guofei Chen
- Key Laboratory of Additive Manufacturing Materials of Zhejiang ProvinceNingbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences Ningbo 315201 China
| | - Xingzhong Fang
- Key Laboratory of Additive Manufacturing Materials of Zhejiang ProvinceNingbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences Ningbo 315201 China
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