The effect of core–shell particles on the mechanical performance of epoxy resins modified with hyperbranched polymers

Li, Shuiping; Lin, Qing; Cui, Chong

doi:10.1557/jmr.2016.174

Cited by 11 publications

(2 citation statements)

References 51 publications

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“…The HBP shell was grown on the silica surface by polycondensation of succinic anhydride and DEA, according to a modified method reported in the literature [21]. The previously synthesized silica NPs (1.4 g) were mixed with succinic anhydride (3.14 g) and the reaction was conducted under magnetic stirring, in a nitrogen atmosphere at 140 °C for 4 h. Then, DEA (2.74 mL) was added to the mixture under a nitrogen atmosphere at 120 °C for 4 h. Afterward, the system was vacuumed for 2 h and the crude product was dissolved in DMF and centrifuged for 10 min to remove pure hyperbranched poly-amide esters.…”

Section: Methodsmentioning

confidence: 99%

Thermal Properties and Fracture Toughness of Epoxy Nanocomposites Loaded with Hyperbranched-Polymers-Based Core/Shell Nanoparticles

et al. 2019

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Synthesized silicon oxide (silica) nanoparticles were functionalized with a hyperbranched polymer (HBP) achieving a core/shell nanoparticles (CSNPs) morphology. CSNPs were characterized by Fourier Transform Infrared (FTIR) spectroscopy, Transmission Electron Microscopy (TEM), and Thermogravimetric Analysis (TGA). A core diameter of about 250 nm with a 15 nm thick shell was revealed using TEM images. An aeronautical epoxy resin was loaded with the synthesized CSNPs at different percentages and thermal properties, such as thermal stability and dynamic mechanical properties, were investigated with the use of different techniques. Although the incorporation of 2.5 wt% of CSNPs induces a ~4 °C reduction of the hosting matrix glass transition temperature, a slight increase of the storage modulus of about ~10% was also measured. The Kissinger Method was employed in order to study the thermal stability of the nanocomposites; the degradation activation energies that resulted were higher for the sample loaded with low filler content with a maximum increase of both degradation step energies of about ~77% and ~20%, respectively. Finally, fracture toughness analysis revealed that both the critical stress intensity factor (KIC) and critical strain energy release rate (GIC) increased with the CSNPs content, reporting an increase of about 32% and 74%, respectively, for the higher filler loading.

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Section: Methodsmentioning

confidence: 99%

Thermal Properties and Fracture Toughness of Epoxy Nanocomposites Loaded with Hyperbranched-Polymers-Based Core/Shell Nanoparticles

et al. 2019

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“…14,15 These hybrids can combine the advantages of core particles and organic polymers. 16 Gao et al. showed that SiO 2 nanoparticles grafted by rubbery block copolymer increased the ductility, fracture toughness and fatigue crack growth resistance of the epoxy matrix.…”

Section: Introductionmentioning

confidence: 99%

Effect of polymer-coated silica particles in a Portland cement matrix via in-situ infrared spectroscopy

Hafshejani

Feng

Wohlgemuth

et al. 2020

Journal of Composite Materials

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It is often of great importance in engineering to know precisely the properties of a material used with regard to its strength, its plasticity or its brittleness, its elasticity, and some other properties. For this purpose, material samples are tested in a tensile test by clamping the sample with a known starting cross-section in a tensile testing machine and loading it with a tensile force F. The force is then graphically displayed over the length change ΔL caused. This curve is called the force-extension diagram. In this study, a new measurement method enables for the first time, depending on the applied uniaxial stress, an insight at the atomic level into various energy dissipation processes at cement-based materials with the help of infrared spectroscopy. The samples are modified by adding SiO2 particles, which are coated by a polymer (PEG-MDI-DMPA) of different PEG molecular weights. Results show that elongating and breakage of [Formula: see text] and [Formula: see text] bonds play an essential role in the strain energy dissipation. Compared to the pure cement, the modified samples are affected more by elongating and breakage of [Formula: see text] as the admixture can effectively reduce the energy barrier of the hydrolytic reaction. The incorporating of particles into the cement matrix induces new mechanisms for energy dissipation by stretching of [Formula: see text] bending vibrations. Stretching vibration of the [Formula: see text] group indicates that part of the energy is dissipated by breakage of hydrogen bonding between the carboxyl group and PEG chains. Besides, a higher value of the ultimate fracture force following an increase in the molecular weight of PEG shows stronger bonding between particles and the cement matrix. As the chain-length of PEG is increased, less energy is absorbed through the other processes (especially at a higher level of strain). Thus, there is a balance between the whole deformation (toughness) and the strength of samples with the increase of the PEG molecular weight.

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Phase state and rheology of polyisobutylene blends with silicone resin

et al. 2020

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The effect of core–shell particles on the mechanical performance of epoxy resins modified with hyperbranched polymers

Cited by 11 publications

References 51 publications

Thermal Properties and Fracture Toughness of Epoxy Nanocomposites Loaded with Hyperbranched-Polymers-Based Core/Shell Nanoparticles

Thermal Properties and Fracture Toughness of Epoxy Nanocomposites Loaded with Hyperbranched-Polymers-Based Core/Shell Nanoparticles

Effect of polymer-coated silica particles in a Portland cement matrix via in-situ infrared spectroscopy

Phase state and rheology of polyisobutylene blends with silicone resin

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