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Ahmadian-Alam L, Teymoori M, Mahdavi H. Polymer grafted GO/sulfonated copolyimide proton exchange nanocomposite membrane: as a polymer electrolyte membranes fuel cell. JOURNAL OF POLYMER RESEARCH 2020. [DOI: 10.1007/s10965-020-02049-w] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Studies of Formation Mechanism, Structure, and Properties of Network Copolymers Obtained by Cocuring of Rolivsan Thermosetting Resins with Aromatic Diamines. INT J POLYM SCI 2019. [DOI: 10.1155/2019/1601236] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Rolivsan thermosetting resins (ROLs) demonstrate high glass-transition temperatures and excellent processability. In our work, high-temperature properties of ROLs were significantly improved using a novel technique for structural and chemical modification of microheterogeneous network polymers. This technique involves, among other procedures, cocuring of rolivsan resins with aromatic diamines (ADA). The most noticeable increase in storage moduli and glass transition temperatures (Tg) of these copolymers was achieved when ROLs were modified with 10-15 wt.% of ADA and the resulting blends were subjected to thermal treatment in air in the temperature range 180 to 320°C for several hours. FTIR, 13С NMR spectroscopy, and dynamic mechanical and thermal analyses were used for studying the structure and properties of the obtained products. It was demonstrated that the mechanism of formation of ROL-ADA copolymers includes the following high-temperature reactions: (i) three-dimensional radical copolymerization of unsaturated ROL components and (ii) cleavage of heat-sensitive methacrylate crosslinking units inside the polymer network. The second process is accompanied by formation of pending units of methacrylic acid and methacrylic anhydride, which participate in condensation reactions with ADA.
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Ashraf AR, Akhter Z, Simon LC, McKee V, Castel CD. Synthesis of polyimides from α,αʹ-bis(3-aminophenoxy)-p-xylene: Spectroscopic, single crystal XRD and thermal studies. J Mol Struct 2018. [DOI: 10.1016/j.molstruc.2018.01.098] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Zaitsev BA. Combination of polymerization and polycondensation in the synthesis, chemical modification, and cure of rolivsan thermosetting resins. HIGH PERFORM POLYM 2018. [DOI: 10.1177/0954008316688760] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Rolivsan thermosetting resins (ROLs) attract constant attention due to their epoxy-like high processability; at the same time, their high-temperature performance is much better than that of epoxy resins and bismaleimides. Development of these materials involves a nontrivial approach to synthesis of thermostable resins; this approach is based on introducing a new structure-forming tool, that is, 1-arylethanol group. The present article demonstrates the important role of polycondensation in rolivsan chemistry. ROLs consist of (di)vinylaromatic ethers and thermosensitive monomeric and oligomeric (di)methacrylates, which are formed after a series of acid-catalyzed reactions between di-secondary aliphatic-aromatic diols, such as bis-[4-( α-hydroxyethyl)phenyl] ether, and unsaturated carboxylic acids, such as methacrylic acid. The process of ROL cure is a combination of polymerization and polycondensation. In the course of this process, in the temperature range from 140°С to 170°С, the initial densely cross-linked ROL-copolymer is formed as a result of three-dimensional radical copolymerization of highly unsaturated components. Post-cure of ROLs in the 200–300°С temperature interval leads to structural rearrangement (polycondensation). Cured ROLs demonstrate morphology typical of thermosets; they consist of highly cross-linked spherical microdomains that are weakly bound by less densely cross-linked polymer interlayers. Thermocatalytic transformations of rolivsans modified by small amounts of additives (epoxies and aromatic diamines) were used in the development of a new approach to synthesis of heat-resistant thermosetting resins via high-temperature polycondensation in interdomain layers (which are used as a peculiar kind of microreactors).
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Affiliation(s)
- Boris A Zaitsev
- Institute of Macromolecular Compounds of the Russian Academy of Sciences, St. Petersburg, Russia
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Kline GK, Zhang Q, Weidman JR, Guo R. PEO-rich semi-interpenetrating polymer network (s-IPN) membranes for CO2 separation. J Memb Sci 2017. [DOI: 10.1016/j.memsci.2017.09.005] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Zaitsev BA, Shvabskaya ID, Kleptsova LG. Novel polycondensation method of improving high-temperature properties of microheterogeneous rolivsan copolymers modified by inserting epoxy and imide bridges between spherical microdomains. HIGH PERFORM POLYM 2017. [DOI: 10.1177/0954008317696564] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Rolivsan thermosetting resins (ROLs) (low-viscosity solvent-free compositions including (di)vinylaromatic ethers and thermosensitive (di)methacrylates) were modified by low amounts of polyfunctional compounds (epoxy resins (ERs) and aromatic diamines (DAs)). Thermochemical transformations in modified ROLs give novel glassy densely cross-linked copolymers with increased high-temperature strength and thermo-oxidative stability. It was revealed that copolymers obtained at different ROLs/ERs and ROLs/DA mixing ratios (which were varied over a wide range) and different heat treatment regimes have various compositions, cross-link densities, chemical, topological, and morphological structures. Structural features of these copolymers were studied by Infrared spectroscopy, dynamic mechanical, thermal, and elemental analyses; the temperature dependences of flexural strength were also obtained. Morphological pattern of the cured ROLs is typical of microheterogeneous polymers where spherical highly cross-linked microdomains (polymer grains) with high Tg are weakly bound by less densely cross-linked defective (intergrain) polymer layers with lower Tg. On the basis of the data obtained in the studies of thermochemical transformations in ROLs/ERs and ROLs/DA blends, the new approach to improving thermal stability and heat resistance of thermosetting resins was developed. We suggest using intergrain layers in microheterogeneous cross-linked polymers as “microreactors” which include target polyfunctional compounds for various high-temperature polymerization and polycondensation reactions.
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Affiliation(s)
- Boris A Zaitsev
- Department of Chemistry, Institute of Macromolecular Compounds of the Russian Academy of Sciences, St. Petersburg, Russia
| | - Irina D Shvabskaya
- Department of Chemistry, Institute of Macromolecular Compounds of the Russian Academy of Sciences, St. Petersburg, Russia
| | - Larisa G Kleptsova
- Department of Chemistry, Institute of Macromolecular Compounds of the Russian Academy of Sciences, St. Petersburg, Russia
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Zaitsev BA, Shvabskaya ID, Kleptsova LG. High-Temperature transformations of aromatic diamines in the Rolivsan matrix. RUSS J APPL CHEM+ 2017. [DOI: 10.1134/s1070427217060167] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Sun D, Yin J, Liu Y, Liu X. The electrical and thermal properties of polyimide/boron nitride nanocomposite films. JOURNAL OF POLYMER RESEARCH 2016. [DOI: 10.1007/s10965-016-1151-x] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Yamamoto M, Ly R, Gill B, Zhu Y, Moran-Mirabal J, Britz-McKibbin P. Robust and High-Throughput Method for Anionic Metabolite Profiling: Preventing Polyimide Aminolysis and Capillary Breakages under Alkaline Conditions in Capillary Electrophoresis-Mass Spectrometry. Anal Chem 2016; 88:10710-10719. [DOI: 10.1021/acs.analchem.6b03269] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Mai Yamamoto
- Department of Chemistry and
Chemical Biology, McMaster University, Hamilton, Ontario L8S 4M1, Canada
| | - Ritchie Ly
- Department of Chemistry and
Chemical Biology, McMaster University, Hamilton, Ontario L8S 4M1, Canada
| | - Biban Gill
- Department of Chemistry and
Chemical Biology, McMaster University, Hamilton, Ontario L8S 4M1, Canada
| | - Yujie Zhu
- Department of Chemistry and
Chemical Biology, McMaster University, Hamilton, Ontario L8S 4M1, Canada
| | - Jose Moran-Mirabal
- Department of Chemistry and
Chemical Biology, McMaster University, Hamilton, Ontario L8S 4M1, Canada
| | - Philip Britz-McKibbin
- Department of Chemistry and
Chemical Biology, McMaster University, Hamilton, Ontario L8S 4M1, Canada
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Chang WY, Chuang CN, Chen SH, Wang CK, Hsieh KH. Preparation and characterization of nano-hybrids combining poly(urea-imide) with a porous silica-pillared layered phase. JOURNAL OF POLYMER RESEARCH 2015. [DOI: 10.1007/s10965-015-0839-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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