Showing papers on "Epoxy published in 2021"
TL;DR: A comprehensive review on the design and synthesis of P-containing flame retardants and their impact on the material properties of epoxy (EP) thermosets is presented in this paper.
338 citations
TL;DR: In this article, a comprehensive review of advanced composite materials based on thermoplastic polymers, elastomer polymers and thermosetting polymers is presented, which have excellent mechanical performances, high thermal resistance, good fire behavior, high impact resistance, best abrasion resistance, exceptional electric insulation and good rigidity.
222 citations
TL;DR: Lamellar-structured graphene aerogels with superior through-plane thermal conduction capacity are fabricated for the first time, and its superior Through-plane Thermal Conductivity enhancement results from its vertically aligned and closely stacked high-quality graphene lamellae.
Abstract: Although thermally conductive graphene sheets are efficient in enhancing in-plane thermal conductivities of polymers, the resulting nanocomposites usually exhibit low through-plane thermal conductivities, limiting their application as thermal interface materials. Herein, lamellar-structured polyamic acid salt/graphene oxide (PAAS/GO) hybrid aerogels are constructed by bidirectional freezing of PAAS/GO suspension followed by lyophilization. Subsequently, PAAS monomers are polymerized to polyimide (PI), while GO is converted to thermally reduced graphene oxide (RGO) during thermal annealing at 300 °C. Final graphitization at 2800 °C converts PI to graphitized carbon with the inductive effect of RGO, and simultaneously, RGO is thermally reduced and healed to high-quality graphene. Consequently, lamellar-structured graphene aerogels with superior through-plane thermal conduction capacity are fabricated for the first time, and its superior through-plane thermal conduction capacity results from its vertically aligned and closely stacked high-quality graphene lamellae. After vacuum-assisted impregnation with epoxy, the resultant epoxy composite with 2.30 vol% of graphene exhibits an outstanding through-plane thermal conductivity of as high as 20.0 W m−1 K−1, 100 times of that of epoxy, with a record-high specific thermal conductivity enhancement of 4310%. Furthermore, the lamellar-structured graphene aerogel endows epoxy with a high fracture toughness, ~ 1.71 times of that of epoxy.
135 citations
TL;DR: One kind of side chain liquid crystal epoxy (S-LCE) based on biphenyl mesomorphic unit is synthesized from 2, 2-bis(hydroxymethyl)propionic acid, 4-phenylphenol, and epichlorohydrin this paper.
130 citations
TL;DR: In this article, 2-Mercaptobenzimidazole (M) was successfully inbuilt in zeolitic imidazolate framework-8 (ZIF-8) on GO nanosheets and then imbedded into epoxy coating to prepare composite coating with pH-responsive and self-healing performances.
114 citations
TL;DR: In this paper, functionalized carbon dots (CDs) obtained from citric acid derivative were selected as intercalator to modify graphene and then dispersed into epoxy matrix to prepare CDs modified graphene/epoxy (CD-G/EP) coatings.
111 citations
TL;DR: A review of recent advances in epoxy vitrimer research can be found in this paper, where the authors discuss the classification and fabrication of epoxide vitrimers and their composites.
101 citations
TL;DR: In this article, a well-dispersed cerium oxide grafting fluorinated reduced graphene oxide (FrGO@CeO2) nanofiller was developed to enhance the anti-corrosion properties of epoxy coating on Q235 mild steel surfaces.
101 citations
TL;DR: In this paper, an ultrathin hydroxyapatite (HAp) nanosheets were noncovalently functionalized by situ self-polymerization of dopamine chemistry with an aim to improve their compatibility and dispersibility in epoxy matrix.
95 citations
TL;DR: Interestingly, the epoxy coatings containing ZIF-67/GO and ZIF/GO@APS particles revealed long-term corrosion protection durability and outstanding self-healing anti-corrosion performance, which were well studied via EIS, salt spray, cathodic delamination, and pull-off techniques.
94 citations
TL;DR: In this article, a simple and universal method was proposed to synthesize an aromatic s-triazine derivative from biomass feedstock, vanillin, and the obtained compound can be employed to construct a bio-based epoxy precursor (THMT-EP).
TL;DR: A novel biobased epoxy vitrimer with desirable mechanical properties was synthesized from glycerol triglycidyl ether (Gte) and an imine-containing hardener (VA) as discussed by the authors.
Abstract: A novel biobased epoxy vitrimer (Gte-VA) with desirable mechanical properties was synthesized from glycerol triglycidyl ether (Gte) and an imine-containing hardener (VA), which was also a biobased ...
TL;DR: In this article, a simple and efficient technique was proposed to yield hyperbranched polyimidazole (HBM) on carbon fiber (CF) surface using isophorone diisocyanate (IPDI) and imidazoles (MZ) as monomers.
TL;DR: The role of synergistic effect and interface on through-plane thermal conductivity and dielectric properties by intercalating the hybrid fillers of the alumina and boron nitride nanosheets (BNNs) into epoxy resin was reported in this paper.
Abstract: Dielectric materials with good thermal transport performance and desirable dielectric properties have significant potential to address the critical challenges of heat dissipation for microelectronic devices and power equipment under high electric field. This work reported the role of synergistic effect and interface on through-plane thermal conductivity and dielectric properties by intercalating the hybrid fillers of the alumina and boron nitride nanosheets (BNNs) into epoxy resin. For instance, epoxy composite with hybrid fillers at a relatively low loading shows an increase of around 3 times in through-plane thermal conductivity and maintains a close dielectric breakdown strength compared to pure epoxy. Meanwhile, the epoxy composite shows extremely low dielectric loss of 0.0024 at room temperature and 0.022 at 100 ℃ and 10-1 Hz. And covalent bonding and hydrogen-bond interaction models were presented for analyzing the thermal conductivity and dielectric properties.
TL;DR: In this paper, the authors reviewed the classification, preparation methods, research progresses and thermal conduction mechanisms of intrinsically thermally conductive liquid crystal epoxy resins and their composites.
TL;DR: In this article, a novel derivative epoxy polymer such as 2,4,6-tris(4-(2-(4-(methoxy oxiran) phenyl) propan-2-yl) phenoxy)-1,3,5-triazine (EPT) was developed as investigated anticorrosive performance for carbon steel (CS) in [1M] HCl medium.
TL;DR: In this article, the ZIF-67 NPs were synthesized and used as a corrosion inhibitor container to enhance the barrier/active corrosion protection features of the epoxy coating.
TL;DR: Results suggest that POSS(epoxy)8 addition during PBAT/PLA film production offers a simple strategy for the production of high performance biodegradable plastic packaging films.
31 Oct 2021
TL;DR: In this article, a novel epoxy-based composite is reported by constructing 3D carbonized cellulose/boric acid ball mill modified boron nitride aerogel (CCA/m-BN) network using ice-templated combined with a customized directional freezing mold approach, and then infiltrating it with epoxy matrix.
Abstract: In the field of modern microelectronic packaging materials, there is a great need for polymer-based composites with both excellent thermal conduction and flame retardancy properties. However, the enhancement efficiency of polymer-based composites is actually lower than the theoretically predicted values due to the phonon scattering in polymer matrix and the interfacial thermal resistance (Ritr) caused by the lack of continuous thermal conductive paths between the polymer matrix and fillers. In this work, a novel epoxy-based composite is reported by constructing 3D carbonized cellulose/boric acid ball mill modified boron nitride aerogel (CCA/m-BN) network using ice-templated combined with a customized directional freezing mold approach, and then infiltrating it with epoxy (EP) matrix. The fabricated CCA/m-BN/EP exhibits a significantly enhanced thermal conductivity (TC) up to 2.11 W/(m K) at a low m-BN loading of 9.6 wt% compared to that of pure PE (0.19 W/(m K)) and traditionally blended m-BN/EP composite (0.40 W/(m K)) as well that of CCACT/m-BN/EP composite (1.54 W/(m K)) obtained with ordinary directional freezing mold. In addition, CCA/m-BN/EP also exhibited a desired flame retardancy performance with considerable reductions being seen in peak of total heat release (THR) and total smoke production (TSP) compared with other composites. The obtained CCA/m-BN/EP composite with high TC and good flame retardancy properties is a highly prospective candidate as next-generation thermal dissipating material for electronic devices.
TL;DR: In this article, the UIO-66, NH2-UIO, and NH2 UIO particles covalently functionalized by Glycidyl Methacrylate (GMA@NH2UIO), were utilized as the novel functional anti-corrosive fillers.
TL;DR: In this paper, the authors reveal the need and importance of adding nano-silica particles (a natural antibacterial substance) into neem oil when it is blended with epoxy resin to form a bio-composite.
Abstract: Epoxy bio composite was prepared using areca fibre, nano-silica and toughened by neem oil bio blender (anti-microbial content) for various engineering applications The principal aim of this research work is to reveal the need and importance of adding nano-silica particles (a natural antibacterial substance) into neem oil when it is blended with epoxy resin to form a bio-composite The nano-silica particle and areca fibre have been surface-treated by an amino silane 3-Aminopropyltriethoxysilane (APTES) for better dispersion on neem-epoxy blended matrix medium The composites were prepared using hand layup method with post-cured at 120 °C in a hot oven The composites have been tested in accordance with ASTM standards The visco-elastic analysis shows that the storage modulus of 2 vol% of nano-silica particles in 30 vol% of areca-reinforced epoxy-neem composite found to be higher up to 98 GPa at room temperature and 18 GPa at 120 °C The loss factor also found to be higher at the glass transition temperature The differential scanning calorimetry results showed that the composites contain 2 vol% of nano-silica particles retains the glass transition (Tg) at higher neem oil blending (20 vol%) as higher than epoxy resin The antimicrobial behaviour of neem-epoxy composite was increased by the addition of 2 vol% of nano-silica Finally, the electrical insulation studies revealed that the composites built with non-polar neem oil and partial polar nano-silica not altered the electrical resistance much These antimicrobial enhanced and thermo-mechanically strengthened epoxy bio composites could be used as food storage containers, medical components carrier and domestic appliance manufacturing
TL;DR: In this paper, a unique 3D interconnected tannic acid modified boron nitride (BN) and C network (M-BN/C) was successfully fabricated by the carbonization of TPU skeletons, which were obtained via simple salt template assisted strategy to enhance the thermal transfer properties of composites.
Abstract: The construction of heat conduction paths in the polymer matrix is essential to improve the thermal management performance of polymer composites. A three-dimensional (3D) thermally conductive network with regular filler structures is very attractive for building fast conductive paths in polymer composites. Herein, a unique 3D interconnected tannic acid modified boron nitride (BN) and C network (M-BN/C) was successfully fabricated by the carbonization of M-BN/thermoplastic polyurethane (TPU) skeletons, which were obtained via simple salt template assisted strategy to enhance the thermal transfer properties of composites. The highly thermally conductive epoxy composites (M-BN/C/EP) were then prepared by impregnating epoxy resin (EP) into the 3D M-BN/C network. The thermal conductivity of the composites with a M − BN loading of 23 wt% is as high as 1.524 W/(m·K), which exhibits a significant enhancement of 702% compared with pure EP. In addition, our composite exhibited outstanding thermal behaviors during heating and cooling processes. Furthermore, the finite element heat conduction simulation further analyzes the heat conduction mechanism of epoxy composites from the theoretical level. This work provides a new idea to significantly enhance the thermal conductivity of thermal management materials.
TL;DR: In this paper, a novel highly-oxidized multi-walled carbon nanotube (O-MWCNT) particles modified by the polyaniline (PANI) nanofibers and their performance in the epoxy-based nanocomposites for achieving passive/active anti-corrosion system with efficacious self-healing potency and barrier anti-crosion characteristic.
TL;DR: In this paper, carbon nanotubes (CNTs) were grafted by silica nanoparticles to prepare CNTs-SiO2 hybrids, which were then incorporated into epoxy matrix to construct a super-hydrophobic coating by a facile one-step spaying method.
TL;DR: In this article, carbon fiber fabrics (CF) were coated by a thin layer of nickel (Ni) using electroless plating to increase the electrical conductivity of the composites and self-polymerized on Ni-coated CF surfaces to enhance the interfacial interactions between fibers and epoxy matrix.
TL;DR: In this article, the corrosion protection properties of PANI-contained coatings on Q215 steel were evaluated and compared through electrochemical impedance spectroscopy measurements in brine, and the experimental results demonstrated that the PFOA/PANI/EP coatings possessed higher corrosion performance than the EP coatings and HCl-doped PANI contained EP coating, which could uniformly distribute in epoxy resin (EP) to enhance their anti-penetrant efficiency towards corrosive media.
TL;DR: In this article, a bio-based epoxy monomer (SA-GA-EP) from syringaldehyde, as well as a biobased curing agent (DIFFA) from furfurylamine was synthesized.
TL;DR: This work would provide a certain theoretical basis for the preparation and applications of high-performance CF composites with different structures and the mechanisms of reinforcement and toughening were also illuminated.