A novel phosphorus/nitrogen-containing polycarboxylic acid endowing epoxy resin with excellent flame retardance and mechanical properties

Duan, Huajun; Chen, Yongsheng; Ji, Sa; Hu, Rui; Ma, Hui

doi:10.1016/j.cej.2019.121916

Cited by 193 publications

(110 citation statements)

References 54 publications

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“…Coke of burned samples with modified resin has compact and continuous char layers. Another non-flammable material was obtained from anhydride-cured epoxy resin with the addition of 26.0 wt % of novel phosphorus/nitrogen containing polycarboxylic acid [12].…”

Section: Introductionmentioning

confidence: 99%

Curing of Epoxy Resin DER-331 by Hexakis(4-acetamidophenoxy)cyclotriphosphazene and Properties of the Prepared Composition

et al. 2019

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The method of optical wedge revealed that the optimum temperature for compatibility of hexakis(4-acetamidophenoxy)cyclotriphosphazene (ACP) and DER-331 epoxy resin is in the range of 220–260 °C. The interdiffusion time of components at these temperatures is about 30 min. The TGA and differential scanning calorimetry (DSC) methods revealed the curing temperature of 280 °С for this composition. IR spectroscopy confirmed that the reaction between the resin and ACP is completed within 10 min. According to the DSC data, a glass transition temperature of 130 °С was estimated for the cured resin. Combustion test UL-94 demonstrated that the obtained material can be assigned to the fireproof category of V-0. Burning droplets were not formed during the burning. The coke formed during the combustion of samples possessed a dense and porous structure. The shape of pores is closed, while their size is in the range of 0.2–200 µm.

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Section: Introductionmentioning

confidence: 99%

Curing of Epoxy Resin DER-331 by Hexakis(4-acetamidophenoxy)cyclotriphosphazene and Properties of the Prepared Composition

et al. 2019

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“…Epoxy resins are thermosetting polymers that have been extensively employed in various areas such as aerospace, coatings, adhesives, electronic devices, laminates and encapsulations due to the characteristics of outstanding mechanical and electrical properties, relatively low curing shrinkage, superior adhesion to substrates as well as good thermal, chemical and corrosion resistance [1][2][3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Rheological and Electrical Study of a Composite Material Based on an Epoxy Polymer Containing Cyclotriphosphazene

et al. 2020

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In this work, we have studied, formulated, prepared, and characterized the rheological and electrical behavior of a composite material based on an epoxy resin Diglycidyl Ether of Bisphenol A (DGEBA) reinforced with hexaglycidyl cyclotriphosphazene (HGCP). The epoxy system was cured with 4,4’-methylene dianiline (MDA). DGEBA-HGCP-MDA epoxy composite materials with reinforced HGCP which varied from 5% to 10% by weight were prepared by mixing in the molten state. The morphology was evaluated by SEM. The rheological behavior was studied using small deformation rheology. The electrical characterization was carried out with a frequency variation range from 1 Hz to 100 KHz at room temperature. These measurements revealed that the rheological and electrical behaviors strongly depend on the quantity of HGCP in the DGEBA matrix. The linear viscoelastic properties study reveals that the modulus of elasticity G’ is dependent on the amount of HGCP present in the epoxy resin DGEBA. The capacitance-frequency measurements suggest a distribution of localized states in the band gap of the blends.

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“…[27,30] Furthermore, an inferior toughening effect can be realized with a non-phase separated structure by simply blending CE with polymers like epoxy. [31][32][33][34][35][36] This is due to its excellent mechanical properties, its affordability, and the fact that it does not release small molecules. [33][34][35][36] The epoxy groups will react with the CE's triazine ring, hindering the formation of the phase-separated structure.…”

Section: Introductionmentioning

confidence: 99%

“…[31][32][33][34][35][36] This is due to its excellent mechanical properties, its affordability, and the fact that it does not release small molecules. [33][34][35][36] The epoxy groups will react with the CE's triazine ring, hindering the formation of the phase-separated structure. [10,32,37,38] Therefore, the toughening effect of cyanate resin modified by epoxy resin is greatly limited.…”

Section: Introductionmentioning

confidence: 99%

“…[10,32,37,38] Therefore, the toughening effect of cyanate resin modified by epoxy resin is greatly limited. [10,34,38,39] In this article, a new method for EP-modified CE is shown to improve toughness by introducing phase separated structures through blending EP with CE. An epoxy prepolymer (PreEP) with several ethylene oxide groups is prepared by modulating the amount of curing agents.…”

Section: Introductionmentioning

confidence: 99%

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Improving the toughness of polycyanate ester by adding epoxy pre‐polymer with different molecular weights

Huang

et al. 2020

J of Applied Polymer Sci

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The toughness of polycyanate ester is improved by adding epoxy pre‐polymer with varying molecular weights. The curing mechanism of epoxy prepolymer (PreEP) and cyanate ester (CE) is discussed based on differential scanning calorimeters and Fourier‐transform infrared spectroscopy. The mechanical, phase separated structures and thermal properties of PreEP/CE are also evaluated. It is found that the molecular weight of PreEP can reach 1,800 when it is cured at 90°C for 45 min by using a set amount of polyetheramine. Meanwhile, by increasing the molecular weight of the prepolymer, the mechanical properties of PreEP/CE show increased first, and then decreased. 0.2 PreEP/CE has the highest bending strength and impact strength (105.8 MPa and 18.3 kJ·m−2). There are 26.7 and 114.5% higher than those of polycyanate ester, respectively. The tougher PreEP/CE is attributable to the phase‐separated structures and the decrease in the cross‐linked product (Oxazolidinone) in PreEP and CE. The method showed in this article provides a new way to improve the toughness properties of thermoset resin.

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A novel phosphorus/nitrogen-containing polycarboxylic acid endowing epoxy resin with excellent flame retardance and mechanical properties

Cited by 193 publications

References 54 publications

Curing of Epoxy Resin DER-331 by Hexakis(4-acetamidophenoxy)cyclotriphosphazene and Properties of the Prepared Composition

Curing of Epoxy Resin DER-331 by Hexakis(4-acetamidophenoxy)cyclotriphosphazene and Properties of the Prepared Composition

Rheological and Electrical Study of a Composite Material Based on an Epoxy Polymer Containing Cyclotriphosphazene

Improving the toughness of polycyanate ester by adding epoxy pre‐polymer with different molecular weights

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