The effect of boehmite nanoparticles (γ‐AlOOH) on nanomechanical and thermomechanical properties correlated to crosslinking density of epoxy

Khorasani, Media Ghasem Zadeh; Silbernagl, Dorothee; Szymoniak, Paulina; Hodoroabă, Vasile-Dan; Sturm, Heinz

doi:10.1016/j.polymer.2018.12.054

Cited by 41 publications

(33 citation statements)

References 34 publications

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“…The boehmite formula is -AlOOH, which is the precursor of -Al 2 O 3 . This formula has been widely used in composites, ceramic materials, protective coatings, and semiconductors [58][59][60][61][62]. The SDS charges the CNT surface negatively, and the stable sol of boehmite is a positively charged nanoparticle.…”

Section: Covalent and Non-covalent Functionalization Combinationmentioning

confidence: 99%

Research on the interface properties and strengthening–toughening mechanism of nanocarbon-toughened ceramic matrix composites

Liu

Jiang

Shi

et al. 2020

Nanotechnology Reviews

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AbstractNanocarbon materials (carbon nanotubes, graphene, graphene oxide, reduced graphene oxide, etc.) are considered the ideal toughening phase of ceramic matrix composites because of their unique structures and excellent properties. The strengthening and toughening effect of nanocarbon is attributed to several factors, such as their dispersibility in the matrix, interfacial bonding state with the matrix, and structural alteration. In this paper, the development state of nanocarbon-toughened ceramic matrix composites is reviewed based on the preparation methods and basic properties of nanocarbon-reinforced ceramic matrix composites. The assessment is implemented in terms of the influence of the interface bonding condition on the basic properties of ceramic matrix composites and the methods used to improve the interface bonding. Furthermore, the strengthening and toughening mechanisms of nanocarbon-toughened ceramic matrix composites are considered. Moreover, the key problems and perspectives of research work relating to nanocarbon-toughened ceramic matrix composites are highlighted.

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Section: Covalent and Non-covalent Functionalization Combinationmentioning

confidence: 99%

Research on the interface properties and strengthening–toughening mechanism of nanocarbon-toughened ceramic matrix composites

Liu

Jiang

Shi

et al. 2020

Nanotechnology Reviews

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“…The amount of the added nanofiller also plays a relevant role in modifying the properties and the curing kinetics of the nanocomposite. As an example, even though appreciable enhancements in stiffness are obtained at not-low boehmite nanoparticles loads (i.e., up to 15 wt.%), these amounts do not allow to achieve an acceptable cross-linking density [ 85 ]. At lower amounts (3 wt.%) of boehmite, on the other hand, increases in mechanical (maximum strength and Young modulus in flexural mode) and surface (hardness) properties are observed (up to 35%), along with an appreciable increase in T g [ 83 ].…”

Section: Nanofillers For Epoxy Resinsmentioning

confidence: 99%

“…Increases in T g have also been reported for epoxy-based nanocomposites containing epoxy-grafted silica (up to 5–6% at a filler content of 2.5 wt.%) [ 66 ] and nano-aluminum nitride (around 13% by adding 1 wt.% of nano-AlN) [ 89 ]. On the other hand, decreases in T g have been found upon the incorporation of nano-Al 2 O 3 particles (greater than 10 °C) at a 0.1 wt.% loading [ 54 ]; more limited reductions in T g (up to 3 °C) have been measured upon addition of boehmite nanoparticles at low concentration levels (i.e., 1 wt.%) [ 85 ]. The different effects of the addition of nanofillers on the T g of the epoxy matrix are the result of different events, namely the restrictions in epoxy chain movements, due to the presence of nanoparticles, and the change in cross-linking density of the matrix resin.…”

Section: Curing/cross-linking Processmentioning

confidence: 99%

“…The incorporation of nanoparticles in epoxy resins allows modification of many properties. In comparison to the neat polymer, enhanced mechanical properties [ 6 , 16 , 27 , 32 , 35 , 45 , 57 , 69 , 85 , 101 , 106 , 108 , 109 , 110 , 111 , 112 , 113 , 114 , 115 , 116 , 117 , 118 , 119 ], improved corrosion resistance [ 21 , 25 , 59 , 64 , 70 , 92 , 108 , 120 , 121 , 122 , 123 , 124 , 125 , 126 ], increased thermal and electrical conductivity [ 5 , 15 , 16 , 17 , 27 , 45 , 86 , 87 , 101 , 109 , 110 , 117 , 127 , 128 ], high dielectric permittivity and low dielectric loss [ 93 ...…”

Section: Properties Of the Epoxy Nanocompositesmentioning

confidence: 99%

“…In most cases, the presence of nanofillers produces increases in toughness [ 19 , 106 , 133 ], which are larger at high nanoparticles loadings [ 110 ]. Stiffness is also enhanced [ 85 , 114 ], but sometimes low increments are observed [ 110 ]. Great adhesive strength is due to mechanisms of mechanical nanoanchoring [ 56 , 92 , 110 , 134 ].…”

Section: Properties Of the Epoxy Nanocompositesmentioning

confidence: 99%

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Recent Advances and Trends of Nanofilled/Nanostructured Epoxies

Frigione

Lettieri

2020

Materials

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This paper aims at reviewing the works published in the last five years (2016–2020) on polymer nanocomposites based on epoxy resins. The different nanofillers successfully added to epoxies to enhance some of their characteristics, in relation to the nature and the feature of each nanofiller, are illustrated. The organic–inorganic hybrid nanostructured epoxies are also introduced and their strong potential in many applications has been highlighted. The different methods and routes employed for the production of nanofilled/nanostructured epoxies are described. A discussion of the main properties and final performance, which comprise durability, of epoxy nanocomposites, depending on chemical nature, shape, and size of nanoparticles and on their distribution, is presented. It is also shown why an efficient uniform dispersion of the nanofillers in the epoxy matrix, along with strong interfacial interactions with the polymeric network, will guarantee the success of the application for which the nanocomposite is proposed. The mechanisms yielding to the improved properties in comparison to the neat polymer are illustrated. The most important applications in which these new materials can better exploit their uniqueness are finally presented, also evidencing the aspects that limit a wider diffusion.

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Integrated Structures from Dissimilar Materials: The Future Belongs to Aluminum–Polymer Joints

Temesi

Czigány

2020

Adv Eng Mater

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The spread of integrated structural elements and parts made from low‐density materials (for example aluminum and polymers) created a need for joining technologies with which these can be joined. Herein, the most important surface preparation methods and joining processes, with which the surface structure of aluminum can be modified and aluminum and polymer structures can be joined, are reviewed. For both topics, a new classification method is introduced: surface preparation methods are grouped based on the method of creating surface structures, whereas joining technologies are grouped according to heat input and structural changes in the polymer material. Herein, “hot” joining technologies (in which so much heat is formed that the polymer material is melted) are reviewed. This grouping category includes techniques based on friction and induction, ultrasonic and laser welding, and some in situ joining technologies. With these, materials with highly different chemical structures and melting temperatures are joined in fast cycles, in a reliable manner. In the coming years, more integrated structures containing aluminum–polymer joints manufactured with fast, automatable joining techniques (such as ultrasonic and laser welding, in compliance with the requirements of Industry 4.0) will be used throughout the industry.

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The effect of boehmite nanoparticles (γ‐AlOOH) on nanomechanical and thermomechanical properties correlated to crosslinking density of epoxy

Cited by 41 publications

References 34 publications

Research on the interface properties and strengthening–toughening mechanism of nanocarbon-toughened ceramic matrix composites

Research on the interface properties and strengthening–toughening mechanism of nanocarbon-toughened ceramic matrix composites

Recent Advances and Trends of Nanofilled/Nanostructured Epoxies

Integrated Structures from Dissimilar Materials: The Future Belongs to Aluminum–Polymer Joints

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