Enhanced cryogenic mechanical properties and liquid oxygen compatibility of DOPO-containing epoxy resin reinforced by epoxy-grafted polysiloxane

Li, Jialiang; Wang, Chao; Lu, Keyu

doi:10.1007/s00289-019-02931-8

Cited by 15 publications

(6 citation statements)

References 29 publications

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“…The XPS spectra and results are shown in Figure S6 and Table S5, respectively. In the C 1s spectra, there were three kinds of carbon-binding states, in which the 289.7 eV peak associated with CC and CO bonds, the 285.8 eV peak associated with C–O and C–N bonds, and the 284.7 eV peak associated with C–H and C–C bonds in aliphatic and aromatic components. , Moreover, the area of peak at 285.8 eV for EP/10% CS1/DOPO2 and EP/10% CS2/DOPO1 chars increased in comparison to EP char, suggesting that more cross-linked carbon composed of C–O and C–N bonds was formed in the residual char. In the N 1s spectra, all EP chars presented two peaks at 400.3 and 398.7 eV, associated with N–H and C–N bonds, respectively .…”

Section: Resultsmentioning

confidence: 99%

Facile Approach for Preparing Chitosan/Phosphaphenanthrene-Containing Epoxy Resins with Superior Flame Retardancy and Mechanical Properties

Zhou

Wang

Bai

et al. 2023

ACS Appl. Polym. Mater.

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Flame-retardant epoxy (EP) composites with excellent mechanical properties that can be produced via facile, cost-effective, and environmentally friendly fabrication are highly desirable. A variety of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) derivatives are used as flame retardants for EP resin due to their high efficiency, but their synthesis is often complicated. In this work, a biomass chitosan (CS) was chosen as a synergist for DOPO to obtain high-performance, fire-safe EPs through simple blending. The total loading of CS and DOPO was limited to 10 wt % in EP, with mass ratios of CS/DOPO being 1:1, 1:2, 1:3, 2:1, or 3:1. At CS/DOPO ratios of 1:2 and 2:1, the obtained EP/10% CS1/DOPO2 and EP/10% CS2/DOPO1 achieved a UL-94 V-0 rating, and their limiting oxygen index increased to 33.7 and 32.5%, respectively. Compared with virgin EP, the heat release and smoke generation of EP/10% CS1/DOPO2 and EP/10% CS2/DOPO1 decreased, especially the total smoke production decreasing by 61.9 and 71.0%. Furthermore, the flexural strength of EP/10% CS1/DOPO2 and EP/10% CS2/DOPO1 was 36.0 and 38.4% higher than that of EP, respectively. The results indicated the synergistic effects of DOPO and CS in enhancing both flame retardancy and mechanical properties of EPs. This work offers a simple and practical strategy for preparing flame-retardant EPs with satisfactory mechanical properties.

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Section: Resultsmentioning

confidence: 99%

Facile Approach for Preparing Chitosan/Phosphaphenanthrene-Containing Epoxy Resins with Superior Flame Retardancy and Mechanical Properties

Zhou

Wang

Bai

et al. 2023

ACS Appl. Polym. Mater.

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“…9 and Table S2, respectively. In the C 1s spectrum, there were three kinds of carbon binding states in the three samples, among which the peak at 287.7 eV belongs to C=C and C=O bonds, the peak at 285.8 eV belongs to C-O and C-N bonds, and the peak at 284.7 eV belongs to C-H and C-C bonds in aliphatic and aromatic components (Li et al 2019). Moreover, it can be clearly seen that the peak at 285.8 eV of the two modi ed EPs increased compared with EP, suggesting that more cross-linked carbon composed of C-O and C-N was formed in the residual carbon.…”

Section: Char Residues Analyses After CC Testsmentioning

confidence: 99%

Flame Retardancy and Mechanical Properties of Chitosan and DOPO with Different Mass Ratios in Epoxy Resin

Wang

Zhou

et al. 2021

Preprint

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This work focused on the effects of chitosan (CS) and 9,10-dihydro-9-oxo-10-phosphaphenanthrene-10-oxide (DOPO) on the flammable propertied of epoxy resin matrix. The EP composites were fabricated by direct mixing method through a general curing method. The influence of CS, DOPO and CS / DOPO on the resin was investigated through cone calorimetry tests (CC), UL-94 vertical burning, limiting oxygen index (LOI), thermal gravimetric analyzer (TGA), differential scanning calorimeter (DSC) and thermogravimetric analyzer-Fourier infrared combined system (TG-FTIR). The char residues of modified EPs after CC tests were investigated by FTIR, EDX and XPS. Under the 10% addition of CS / DOPO in EP, with the mass ratio of CS and DOPO of 1 : 1, 1 : 2, 1 : 3, 2 : 1 and 3 : 1, the flame retardancy properties of EPs all increased, but only if EP/10% CS1/DOPO2 and EP/10% CS2/DOPO1 achieved a V-0 rating and their values of LOI were 33.7% and 32.5%, respectively. Compared with EP, the peak heat release rate, peak smoke produce rate and total heat release of EP/10% CS1/DOPO2 and EP/10% CS2/DOPO1 decreased, especially, total smoke release decreased by 61.9% and 71.0%, the char residuals amount increased by 84.3% and 41.6%, and the average CO2 yield decreased by 55.4% and 55.0%, respectively. It is worth nothing that the mechanical properties increased, especially the flexural strength increased by 36.0% and 38.4%, respectively. The results indicated that DOPO and CS had important synergistic effects for simultaneous increase both the flame retardancy and mechanical properties of EP composites.

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“…The improvement of the fracture toughness of EPs has attracted the attention of many researchers. [13][14][15][16][17][18][19][20] In addition, the high flammability of EP is the main drawback limiting its application in high-performance areas. 21,22 For this reason, improvement of the flame retardancy of EP is needed.…”

Section: Introductionmentioning

confidence: 99%

Phosphorous-jointed epoxidized soybean oil and rice husk-based silica as the novel additives for improvement mechanical and flame retardant of epoxy resin

Nguyen

Bach

2020

Journal of Fire Sciences

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The combined effects of phosphorous-jointed epoxidized soybean oil and rice husk–based silica on the flammability and mechanical properties of epoxy resin were examined in detail. The chemical structures of the epoxidized soybean oil, phosphorous-jointed epoxidized soybean oil, and rice husk–based silica were confirmed using Fourier transform infrared spectroscopy and proton nuclear magnetic resonance. Many characteristics of the obtained composite materials were examined, such as the tensile properties, impact strength, flexural strength, critical stress intensity factor (KIC), dynamic mechanical analysis, and flammability. The incorporation of both 10 phr phosphorous-jointed epoxidized soybean oil and 20 phr rice husk–based silica into the epoxy resin yielded the optimum values of the flexural strength, tensile strength, impact strength, and KIC, with increases of 87.78%, 67.23%, 109.34%, and 111.32%, respectively, compared with pristine samples. The limiting oxygen index increased from 23.1% to 29.3%, the peak heat-release rate decreased by up to 37.2%, and the sample satisfied the UL94 V-0 rating.

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Enhanced cryogenic mechanical properties and liquid oxygen compatibility of DOPO-containing epoxy resin reinforced by epoxy-grafted polysiloxane

Cited by 15 publications

References 29 publications

Facile Approach for Preparing Chitosan/Phosphaphenanthrene-Containing Epoxy Resins with Superior Flame Retardancy and Mechanical Properties

Facile Approach for Preparing Chitosan/Phosphaphenanthrene-Containing Epoxy Resins with Superior Flame Retardancy and Mechanical Properties

Flame Retardancy and Mechanical Properties of Chitosan and DOPO with Different Mass Ratios in Epoxy Resin

Phosphorous-jointed epoxidized soybean oil and rice husk-based silica as the novel additives for improvement mechanical and flame retardant of epoxy resin

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