Simultaneously reinforcing and toughening epoxy network with a novel hyperbranched polysiloxane modifier

Liu, Hanchao; Gao, Xiaoxiao; Deng, Bo; Huang, Guangsu

doi:10.1002/app.46340

Cited by 29 publications

(17 citation statements)

References 53 publications

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“…Therefore, toughening of epoxies is a major challenge. Several techniques have been introduced for improving the toughness of the epoxy resins which could be divided into two main categories: physical modification (addition of a toughening agent into the epoxy resin) and chemical modification (modification in the chemical structure of the epoxy network) . Some common toughening agents are liquid elastomers, inorganic particles, and thermoplastics .…”

Section: Introductionmentioning

confidence: 99%

Systematic investigation of mechanical properties and fracture toughness of epoxy networks: Role of the polyetheramine structural parameters

Abdollahi

Salimi

Barikani

et al. 2018

J of Applied Polymer Sci

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Polyetheramine (PEA)-modified epoxies with various types of PEAs were prepared and respective effects on characteristics of epoxy networks were studied. The used PEAs were polyethylene glycol diamine (PEG-amine) and polypropylene glycol diamine (PPGamine) with two different molecular weights (i.e., 200 and 400 g mol −1 ). According to mechanical tests, the structural parameters of PEAs played an important role in final properties of epoxy/amine systems. PEG 400 -amine and PPG 200 -amine had the highest and lowest effects on the properties of epoxy networks, respectively. Whereas 10 phr PEG 400 -amine increased critical stress intensity factor (K IC ) and critical strain energy release rate (G IC ) of the epoxy up to 82 and 294%, the same number of PPG 200 -amine chains caused to increase the K IC and G IC up to 11 and 34%. This discrepancy could be assigned to higher flexibility index (φ = 26.22), longer chain length (~27 atoms), and higher secondary interactions [δ = 9.69 (cal cm −3 ) 0.5 ] of PEG 400 -amine in comparison with PPG 200 -amine [with φ = 8.08,~10 atoms in chain, and δ = 8.98 (cal cm −3 ) 0.5 ]. Shear yielding as a toughening mechanism was proposed based on microscopy of the crack tips. These in-depth studies could uncover underlying structure-property relationships in a relevant class of PEA-like modifiers, shedding light on the future design of top-performing homogeneous tough polymer networks.

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Section: Introductionmentioning

confidence: 99%

Systematic investigation of mechanical properties and fracture toughness of epoxy networks: Role of the polyetheramine structural parameters

Abdollahi

Salimi

Barikani

et al. 2018

J of Applied Polymer Sci

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“…31 Meanwhile, silicon-containing modifiers are also constantly being studied, for that they may enhance the flame retardancy without sacrificing strength of epoxy resins. 32–37…”

Section: Introductionmentioning

confidence: 99%

“…31 Meanwhile, silicon-containing modifiers are also constantly being studied, for that they may enhance the flame retardancy without sacrificing strength of epoxy resins. [32][33][34][35][36][37] However, the mechanical properties of epoxy resin may be compromised when too many modifiers are introduced for flame retardancy, which greatly reduces its use value. 15,17 Therefore, it is very necessary to find a way to get the flame retardancy and mechanical properties improved at the same time.…”

Section: Introductionmentioning

confidence: 99%

The P/Si synergistic effect enduing epoxy resin with improved flame retardancy and outstanding mechanical properties

Hou

Li²,

Wang

et al. 2022

High Performance Polymers

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The bisphenol F epoxy resin (DGEBF) reacted with 10-(2,5-Dihydroxyphenyl)-10H-9-oxa-10-phospha-phenantbrene-10-oxide (ODOPB) and phenyltrimethoxysilane (PTMS) to obtain a novel epoxy resin containing both phosphorus and silicon (EP-P/Si). EP-P/Si exhibited evidently improved flame retardancy, with a limited oxygen index value of 33.4% and UL-94 V-1 rating acquired. In cone calorimeter test, its peak heat release rate (PHRR), total heat release (THR), average effective heat of combustion (av-EHC), and total smoke production (TSP) were reduced by 36.0%, 19.5%,11.5%, and 7.2% compared with neat epoxy resin (EP), respectively, indicating that the P/Si synergistic effect not only improved the flame retardancy but also inhibited the smoke release. The flame retardancy mechanism was studied by analysis of char residue and pyrolysis behavior in gas phase. Scanning electron microscopy (SEM) results exhibited that EP-P/Si formed a dense and compact carbon layer acting as a barrier to inhibit further combustion. And the Fourier transform infrared (FTIR) spectra, laser Raman spectroscopy (LRS), and X-ray photoelectron spectroscopy (XPS) results indicated that it had good thermal stability. In addition, the pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) results suggested that the phosphorus-containing radicals (·PO2) that had quenching effect existed in the gas phase. While the flame retardancy got improved, EP-P/Si also exhibited excellent mechanical properties, with an improvement of 31.8%, 6.2%, and 369.7% in tensile strength, flexural strength, and impact strength compared with EP, respectively.

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“…The special structure of hyperbranched structure led to low dielectric properties and toughening effect of synthesized resin. [29][30][31] The prepared resin was cured at high temperature, and the mechanical and thermal properties of the cured products were characterized.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of phthalonitrile resin within hyperbranched structure

Wang

Liu

Han

et al. 2020

High Performance Polymers

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In this article, a kind of polyester-type phthalonitrile cyano resin (2,2-bis (((3-((4-(3,4-dicyanophenoxy) benzoyl)oxy)-2-(hydroxymethyl)-2-methylpropanoyl)oxy)methyl) propane-1,3-diyl)bis(oxy)) bis (2-(hydroxymethyl)-2-methyl-3-oxopropane-3, 1-diyl) bis (4-(3,4-dicyanophenoxy) benzoate (hbppn)) with branched structure was introduced. The molecular structure and relative molecular mass of hbppn were characterized by nuclear magnetic resonance, Fourier transform infrared spectroscopy, and the matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF). The results showed that the synthesized HBPPN contained both polyester and hyperbranched structures. The thermal and rheological properties of HBPPN were characterized by differential scanning calorimetry and rheometer, and the results showed that HBPPN would be cured at about 322°C and the viscosity of the resin showed good processability. The results of dynamic mechanical analysis and thermogravimetric analysis showed that the synthesized resin had good heat resistance. The glass transition temperature was above 329°C, the residual weight ( C y) at 900°C was as high as 66.2% in the nitrogen atmosphere, and the temperature at which the resin lost 5 wt% of heat in air atmosphere was about 423.3°C. The synthesized HBPPN had good comprehensive properties, which could be applied to high-temperature resistant and thermal protection materials.

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Simultaneously reinforcing and toughening epoxy network with a novel hyperbranched polysiloxane modifier

Cited by 29 publications

References 53 publications

Systematic investigation of mechanical properties and fracture toughness of epoxy networks: Role of the polyetheramine structural parameters

Systematic investigation of mechanical properties and fracture toughness of epoxy networks: Role of the polyetheramine structural parameters

The P/Si synergistic effect enduing epoxy resin with improved flame retardancy and outstanding mechanical properties

Preparation and characterization of phthalonitrile resin within hyperbranched structure

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