Functionalized multi-walled carbon nanotubes/hydrogen-rich benzoxazine nanocomposites for cosmic radiation shielding with enhanced mechanical properties and space environment resistance

Cha, Ji-Hun; Jang, Woo-Hyeok; Kumar, Sathish Kumar Sarath; Noh, Jung-Eon; Choi, Joo-Seung; Kim, Chun-Gon

doi:10.1016/j.compscitech.2022.109634

Cited by 20 publications

(4 citation statements)

References 14 publications

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“…Aerospace and naval composites, − automotive frames and components, , composite pipes for gas or oil, , circuit boards, , aerogels, , self-healing materials, − coatings and corrosion protection, − and paints , are among these end-use applications. PBzs possess highly attractive features such as high glass transition temperature ( T g ), , low water absorption, near zero shrinkage upon polymerization, , high char yield, , fast evolution of mechanical properties with the conversion, , similar and even lower costs than epoxy and bismaleimides resins, and excellent dielectric properties. , These outstanding properties and intrinsically rich molecular design flexibility allowing good compatibility with other structures have rendered PBz an important contender to epoxy and traditional phenolic resins in the composite industry.…”

Section: Introductionmentioning

confidence: 99%

“…Metal–organic frameworks (MOFs) are a relatively new class of porous materials that have an ordered and well-defined structure. Metal/metal oxide clusters that are connected through organic linkers constitute their structures. , Moreover, MOFs have high porosity, low density, and large pore volume with a high surface area, which are critical parameters for some applications. − For example, MOFs are well-known for their ability to catalyze diverse types of reactions, including polymerizations. Numerous MOF-based catalysts have been previously developed for catalytic polymerization. − Moreover, among MOF-based composites, MOF-polymer hybrids have recently gained tremendous attention in the field of composite materials. − Typically, many MOFs are more compatible with organic matrixes compared to well-known inorganic nanofillers like silica, alumina, and mesoporous carbon since the organic linkers may interact with the monomers/polymers via different routes. , The mutual combination of MOFs and polymers has created a new field in both polymer and MOF chemistry and technology.…”

Section: Introductionmentioning

confidence: 99%

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Kinetic Modeling of Ring-Opening Polymerization of Benzoxazines Using MIL-53-Al as a Potent Catalyst

Omrani

Deliballi

Kışkan

et al. 2023

Ind. Eng. Chem. Res.

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In this study, we report the successful synthesis of a novel Al-based MOF/polybenzoxazine nanocomposite by a facile and green approach via thermally induced ring-opening polymerization (ROP). Structural and thermal characterization of the synthesized nanocomposite was accomplished using FTIR, XRD, BET and TGA, and DSC techniques, respectively. The Al-MOF showed catalytic activity in ROP and good thermal stability compared to the non-catalyzed system. The catalytic impact of MIL-53-Al on the ROP of benzoxazine is revealed by calorimetry at both isothermal and dynamic modes in detail. The Starink isoconversional analysis revealed that the MOF-catalyzed ROP proceeded faster at the reaction’s early stages, typically at α ≤ 40%. The Friedman method was also applied to the experimental data to get more insights into the mechanisms of the ROP reaction. Results indicated that both systems follow a conversion-dependent mechanism for cationic ROP of the benzoxazine. Although the complexity of the ROP of benzoxazines reduces the reliability of model fitting, the activation energy data were confirmed. Moreover, it was demonstrated that the reaction mechanism changes from the autocatalytic to the n-order regime during the reaction. An ROP mechanism is proposed at which the available AlO4(OH)2 octahedra act as active sites shifting the curing exotherms to lower temperatures.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Kinetic Modeling of Ring-Opening Polymerization of Benzoxazines Using MIL-53-Al as a Potent Catalyst

Omrani

Deliballi

Kışkan

et al. 2023

Ind. Eng. Chem. Res.

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“…Indeed, the wide variety of radiation encountered in space including galactic cosmic radiation (GCR) and solar energetic particles (SEPs) can have similar effects and also require proper shielding. [6][7][8] Aiming to attenuate these radiations, researchers tried to utilize the existing materials (lead, concrete, aluminium, water, and so on) or developed new ones. 9,10 In fact, heavy materials and water are more suitable to be used inside nuclear reactors and to surround radioactive sources.…”

Section: Introductionmentioning

confidence: 99%

Phthalonitrile resin reinforced silane surface modified boron carbide: Efficient neutrons screening and exceptional thermal properties

Abdous

Derradji

Mehelli

et al. 2023

High Performance Polymers

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The design of lightweight neutron shields has been restricted for quite some time to the use of epoxy thermosets as the main building blocks. Meanwhile, the recent developments in the field of polymers suggest otherwise. Indeed, the phthalonitrile (PN) resins have taken the lead over traditional thermosets in many demanding applications. Therefore, in a vision to introduce newer matrices with better performances and to further expand the applications of the PN resins into the nuclear field, the neutron shielding efficiency along with the thermal resistance performances of the neat PN polymer and its subsequent silane surface-modified B4C-reinforced composites were investigated. The neutron shielding measurements were performed using an optimized experimental setup at the NUR research reactor in Algiers. The neat PN polymer displayed better thermal neutron screening performances than the epoxy and benzoxazine, with a macroscopic cross-section (Σ) of a 1.936 cm−1, equivalent to a mean free path (λ) of 0.358 cm. The effect of the particle amount was also studied to maximize the shielding ability of the developed materials. For instance, the PN composite containing 20 wt. % of B4C displayed an outstanding screening ratio of about 99.8% for a sample thickness of 13 mm. Finally, the remarkable findings were put into context by providing multifaceted comparisons with the available shielding materials.

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“…Benzoxazines are also chemically stable and highly tailorable through reagents, making them suitable for numerous advanced applications. Taking advantage of the versatile molecular design flexibility of benzoxazines, polybenzoxazines specifically designed for space applications have been reported [ 3 , 4 , 5 , 6 ]. The aim of the current paper was to develop a polybenzoxazine-based composite system that is resistant to atomic-oxygen erosion for low-Earth orbital applications.…”

Section: Introductionmentioning

confidence: 99%

Development of an Atomic-Oxygen-Erosion-Resistant, Alumina-Fiber-Reinforced, Fluorinated Polybenzoxazine Composite for Low-Earth Orbital Applications

et al. 2022

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An atomic-oxygen-erosion-resistant fluorinated benzoxazine resin and composite were developed. The benzoxazine resin, abbreviated as “BAF-oda-fu,” consists of four benzoxazine rings, and was synthesized from bisphenol AF (BAF), 4,4′-oxydianiline (oda), furfurylamine (fu), and paraformaldehyde. The resin was characterized by infrared spectroscopy (FT-IR), proton nuclear magnetic resonance spectroscopy (1H NMR), differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA). An analysis of the solvent-washed product showed a technical grade purity (>95%) and a yield of approximately 85%. Subsequent polymerization of the resin was successfully performed by heating step-wise and opening the benzoxazine rings to form a crosslinked network. Thermal analyses showed a melting temperature of 115 °C and polymerization temperature of 238 °C, both being characteristic values of benzoxazine monomers. The benzoxazine resin was also blended with polyoctahedral sisesquoxane (POSS) and reinforced with alumina fibers. The Tg of the resin, as determined by DMA of the composite, could reach as high as 308 °C when post-curing and the POSS additive were utilized. The low-Earth orbit atomic-oxygen erosion rate was simulated by an RF plasma asher/etcher. The atomic-oxygen resistance of poly(BAF-oda-fu) fell along an established trend line based on its fluorine content.

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Functionalized multi-walled carbon nanotubes/hydrogen-rich benzoxazine nanocomposites for cosmic radiation shielding with enhanced mechanical properties and space environment resistance

Cited by 20 publications

References 14 publications

Kinetic Modeling of Ring-Opening Polymerization of Benzoxazines Using MIL-53-Al as a Potent Catalyst

Kinetic Modeling of Ring-Opening Polymerization of Benzoxazines Using MIL-53-Al as a Potent Catalyst

Phthalonitrile resin reinforced silane surface modified boron carbide: Efficient neutrons screening and exceptional thermal properties

Development of an Atomic-Oxygen-Erosion-Resistant, Alumina-Fiber-Reinforced, Fluorinated Polybenzoxazine Composite for Low-Earth Orbital Applications

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