Toughening of Epoxy Nanocomposites: Nano and Hybrid Effects

Marouf, Bahereh T.; Mai, Yiu‐Wing; Bagheri, Reza; Pearson, Raymond A.

doi:10.1080/15583724.2015.1086368

Cited by 146 publications

(111 citation statements)

References 214 publications

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“…Although the economic and environmental benefits of light‐weighting are well understood, the major disadvantage of crosslinked epoxy/amine networks, their brittleness or lack of ductility, remains an impediment to further usage. Multitudes of studies over the years have been undertaken to toughen epoxy networks and composites with varying levels of success, most notably via the addition of inherently tough modifiers or interlayer films . Despite often achieving excellent improvements in toughness, disadvantages such as increases in viscosity, inhomogeneous dispersion or some compromise to other desirable properties invariably occurs.…”

Section: Introductionmentioning

confidence: 99%

Effect of aromatic substitution on the kinetics and properties of epoxy cured tri‐phenylether amines

Varley

Dao

Tucker

et al. 2019

J of Applied Polymer Sci

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The reaction kinetics and structure property relationships of isomeric tri‐aromatic ether‐linked amines based on the structure bis (aminophenoxy) benzene, cured with diglycidyl ether of bisphenol F (BisF) are investigated in this study. Reaction kinetics are explored using rheological and calorimetric measurements, whereas structure property relationships are determined from their flexural properties, dynamic mechanical properties (DMTA), and thermogravimetric analysis (TGA). A BisF network cured with 4,4 diamino diphenyl sulphone (44 DDS) is used as a benchmark to represent a commercially available high‐performance resin system. Varying the substitution of the ether linkages on the aromatic groups from ortho, meta to para was found to have a significant impact on reactivity and network properties after cure. The variations are explained in terms of inductive and resonance effects primarily acting on the outer aromatic rings. Interestingly, however, these same effects acting on the central aromatic ring also impact upon reactivity despite their proximity from the amines. Mechanical and thermal properties are explained by changes in the short‐range molecular mobility within the network architecture such as phenylene rotations or π flips and are experimentally validated from the breadth and position of the subambient γ relaxations. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47383.

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Section: Introductionmentioning

confidence: 99%

Effect of aromatic substitution on the kinetics and properties of epoxy cured tri‐phenylether amines

Varley

Dao

Tucker

et al. 2019

J of Applied Polymer Sci

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“…However, epoxy resin is inherently brittle because of its high degree of cross‐linking. To overcome these limitations, researchers have incorporated rubber , thermoplastic , clay , carbon nanotubes , and graphene in epoxy resin to improve its toughness. The toughening agents used in these methods are always highly viscous liquids or even solid fillers, which make the molding process very difficult due to increased viscosity of the epoxy blends.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous toughening and strengthening of diglycidyl ether of bisphenol‐a using epoxy‐ended hyperbranched polymers obtained from thiol‐ene click reaction

Zhang

Liu

Cheng

et al. 2017

Polymer Engineering & Sci

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Epoxy‐ended hyperbranched polymers (EHBP) has become a class of additives for diglycidyl ether of bisphenol‐A (DGEBA), but it is tedious processes retards wide application. Here, we prepared EHBP by a thiol‐ene click reaction between thiol‐terminated hyperbranched polyesters and allyl glycidyl ether and modified DGEBA. The incorporation of EHBP significantly enhanced the toughness and strength of DGEBA. The mechanical properties of EHBP/DGEBA composite increased remarkably with the increasing EHBP molecular weight initially, and then decreased with further increase of EHBP molecular weight. The maximum increase of mechanical properties was observed in EHBP‐12/DGEBA composites. With increasing EHBPE‐12 content, the mechanical performance of the EHBP‐12/DGEBA composites increased firstly and plateaued at 9 wt% EHBP‐2. At 9 wt% EHBP‐12 content, the tensile strength, flexural strength and impact strength increased to 74.46 MPa, 143.58 MPa, and 39.09 kJ m−2, respectively. When loading was increased from 12 to 15 wt%, the mechanical performance started to decrease. The use of EHBP slightly decreased the thermal stability and the glass transition temperature. Protonema observed in the fracture surface can be used to explain the significant improvement in mechanical properties. POLYM. ENG. SCI., 58:1703–1709, 2018. © 2017 Society of Plastics Engineers

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“…Cracks grew easily and resulted in a fracture to such neat epoxy [22]. The energy absorption increased as silica particles introduced to the neat epoxy [23]. Deflected crack growth due to the presence of silica particles increased the energy absorption in the epoxy/silica composite.…”

Section: Effects Of Silica Weight Fractionmentioning

confidence: 98%

Effects of mixed micro and nano silica particles on the dynamic compressive performances of epoxy adhesive

Yohanes

Sekiguchi

2017

Appl Adhes Sci

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Toughening of Epoxy Nanocomposites: Nano and Hybrid Effects

Cited by 146 publications

References 214 publications

Effect of aromatic substitution on the kinetics and properties of epoxy cured tri‐phenylether amines

Effect of aromatic substitution on the kinetics and properties of epoxy cured tri‐phenylether amines

Simultaneous toughening and strengthening of diglycidyl ether of bisphenol‐a using epoxy‐ended hyperbranched polymers obtained from thiol‐ene click reaction

Effects of mixed micro and nano silica particles on the dynamic compressive performances of epoxy adhesive

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