How does functionalization of h-BN affect the dispersibility in epoxy composites?
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Functionalization of hexagonal boron nitride (h-BN) significantly impacts its dispersibility in epoxy composites. Surface modification of h-BN with silane coupling agents enhances its chemical compatibility with the epoxy resin matrix, improving dispersibility. Various methods like hydroxylation and grafting with different silane agents are employed to modify h-BN, enhancing its affinity with polymers. Functionalization, such as surface modification with sulfuric acid, leads to uniform dispersion of h-BN in the polymer matrix, significantly improving thermal conductivity and mechanical properties of the composite materials. These modifications play a crucial role in enhancing the dispersibility of h-BN in epoxy composites, ultimately improving their overall performance and reliability in various applications.
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| Papers (5) | Insight |
|---|---|
9 Citations | Surface functionalization of h-BN with sulfuric acid enhances dispersibility in PEI composites, leading to improved thermal conductivity and mechanical properties, as well as increased electrical breakdown strength. |
6 Citations | Functionalization of h-BN with polydopamine and (3-aminopropyl) triethoxysilane enhances dispersibility in epoxy composites, leading to superior corrosion resistance in the nanocomposite coatings. |
03 Jul 2022 | Functionalization of h-BN with a silane coupling agent enhances dispersibility in epoxy composites by increasing chemical compatibility, as observed through FTIR and SEM analysis in the study. |
03 Jul 2022 | Functionalization of h-BN with silane coupling agent enhances dispersibility in epoxy composites by increasing chemical compatibility, as observed through FTIR and SEM analysis in the study. |
| Functionalization of h-BN enhances dispersibility in polymer blends. Grafting PMMA chains onto hydroxylated h-BN particles improves affinity, leading to successful localization at the blend interface. |
Related Questions
How does functionalization of h-BN affect the mechanical properties of epoxy composites?5 answersFunctionalization of hexagonal boron nitride (h-BN) significantly impacts the mechanical properties of epoxy composites. Studies have shown that functionalized h-BN fillers, such as BPEI-KH560-BNNS, KH560 and NH2-POSS modified f-BN, and hydroxyl-functionalized BNNSs, enhance the tensile strength, Young's modulus, toughness, and hardness of the composites. The functionalization improves interfacial compatibility between the fillers and the epoxy matrix, leading to better stress transfer and increased mechanical performance. However, excessive filler content beyond optimal levels can lead to filler agglomeration and reduced mechanical property enhancements. Overall, functionalization of h-BN plays a crucial role in enhancing the mechanical properties of epoxy composites by promoting better dispersion, stress transfer, and filler-matrix interactions.
What is the current state of research on optimizing hBN epoxy nanocomposites with ANN?5 answersThe current state of research on optimizing hexagonal boron nitride (h-BN) epoxy nanocomposites using artificial neural networks (ANN) involves enhancing both thermal and electrical properties. Studies show that integrating surface-modified h-BN nanoparticles into epoxy improves thermal conductivity but may weaken electrical insulation properties. Additionally, the use of ANN models has successfully predicted wear rates in epoxy-based nanocomposites reinforced with boron carbide nanoparticles, with a mean relative absolute error of 4.27%. Furthermore, ANN has been employed to develop predictive models for carbon nano-onion-reinforced epoxy composites, demonstrating high accuracy in predicting surface roughness based on various milling parameters. These advancements highlight the potential of ANN in optimizing h-BN epoxy nanocomposites for diverse applications.
How does the addition of boron nitride affect the strength and physical treatment performance of polymeric membranes?5 answersThe incorporation of boron nitride (BN) into polymeric membranes significantly enhances their strength and physical treatment performance. Studies have shown that BN nanosheets provide additional transport channels, selectivity, and strong adsorption capacity, leading to improved membrane properties such as permeability and stability. Composite membranes with BN exhibit enhanced tensile strength, hydrophilicity, and proton conductivity, indicating better mechanical properties and potential proton transport channels for applications in fuel cells. Furthermore, the addition of functionalized hexagonal BN nanosheets/graphene oxide/silver (FBN-GO-Ag) composite in polyethersulfone membranes results in increased permeability, antifouling, antibacterial properties, and enhanced separation ability. Additionally, the presence of hexagonal-BN nanosheets in polyvinylidene fluoride membranes improves water-oil separation selectivity and efficiency, making them excellent candidates for water-oil emulsion separations.
How can hexagonal boron nitride be synthesized?5 answersHexagonal boron nitride (h-BN) can be synthesized using various methods. One approach is the chemical vapor deposition (CVD) method, where the substrate is heated at a first temperature and then exposed to precursors containing boron and nitrogen at a specific partial pressure and temperature. Another method is the dual temperature zone low-pressure CVD, where a single ammonia borane precursor is used on a non-catalytic substrate. The growth rate and crystal quality of h-BN films can be controlled by adjusting the position in the dual temperature zone. Scalable approaches for high-quality h-BN synthesis have been reviewed, highlighting the challenges of maintaining stoichiometric balance and stacking order between layers. Controllable synthesis of h-BN using CVD has been explored to achieve full control over domain size, orientation, morphology, layer number, and stacking order. These methods provide a basis for the preparation of large area wafer thick h-BN films and the utilization of h-BN in various applications.
What are the mechanisms by which boron or nitrogen atoms are removed during the exfoliation of h-BN?4 answersDuring the exfoliation of h-BN, the mechanisms by which boron or nitrogen atoms are removed include dissociation of h-BN in solvothermal exfoliation, thermal assisted exfoliation with oxygen interstitial and substitution of nitrogen at high temperature, and exfoliation of h-BN powders using a non-thermal plasma source. The solvents used in solvothermal exfoliation play a role in the dissociation process, with different solvents having varying dissolving abilities to h-BN. The inclusion of lithium chloride and cetyltrimethylammonium bromide can enhance the dissociation degree and yield smaller lateral sizes of boron nitride nanosheets (BNNSs). In thermal exfoliation, the contraction and expansion of the a-axis and c-axis of h-BN are observed, suggesting the involvement of oxygen interstitial and substitution of nitrogen at high temperature. Non-thermal plasma source exfoliation results in the generation of few-layered h-BNNSs with increased lattice planes and hydroxyl group defects.
How to coat epoxy resin and borax?3 answersTo coat epoxy resin and borax, one possible method is to use a preparation method that involves mixing the epoxy resin with other components. For example, in the preparation method described by Liu Chuanli, polytetrafluoroethylene wax is added to an amide solution, which is then mixed with sulfoxide chloride solution containing stearic acid and titanium dioxide. This mixture is further combined with an aminated polyester emulsion, epoxy resin E51, and boron trifluoride diethyl etherate. The resulting mixture improves the dispersion performance of the epoxy resin in the water emulsion and enhances the adhesion force of the finished coating. Another method involves using a zinc-containing epoxy resin coating composition, as described by Shinichi Ishihara et al.. This composition includes an epoxy resin, a polyamide adduct resin, and zinc. Coating the base material with this composition provides high adhesion between the coating film and the base material, making it suitable for applications requiring anticorrosion ability.