Synthesis of a novel dual layered double hydroxide hybrid nanomaterial and its application in epoxy nanocomposites

Zhang, Zhida; Qin, Jianyu; Zhang, Wenchao; Pan, Ye‐Tang; Wang, De‐Yi

doi:10.1016/j.cej.2019.122777

Cited by 124 publications

(47 citation statements)

References 32 publications

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“…The gaseous pyrolysis products of EP‐0 and EP‐7.5 at 400°C are displayed in Figure 15C. As shown in Figure 15C, the similar characteristic peaks correspond to the main pyrolysis products, including ethers (1175 and 1260 cm −1 ), aromatic substances (1338, 1514, 1612, and 3033 cm −1 ), aldehydes/ketones (1682‐1800 cm −1 ), carbon monoxide (2108 and 2180 cm −1 ), carbon dioxide (2328 and 2361 cm −1 ), compounds containing alkane (2800‐3000 cm −1 ), and phenols/H 2 O (3500‐3680 cm −1 ) 3,25 . The absorbance peak intensity of total gaseous pyrolysis products (displayed in Figure 15D) for EP‐7.5 is lower than that of EP, suggesting the decrement in the gaseous pyrolysis products for the epoxy resin by incorporation of HPD.…”

Section: Resultsmentioning

confidence: 82%

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Synthesis of a hyperbranched polyamide oligomer containing DOPO for simultaneously enhancing the flame retardance and glass transition temperature of epoxy resin

Luo

Sun

et al. 2020

Polymers for Advanced Techs

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Flame retardants endow epoxy resins (EP) with flame retardance, however, their introduction often lead to the decrease in the glass transition temperature (Tg), which is an important property for EP. Therefore, it is significant to design and synthesize a high‐efficiency flame retardant that enhances flame retardance and Tg of EP. To achieve this goal, a hyperbranched polyamide oligomer containing DOPO (HPD) was successfully synthesized by A4 + B2 polymerization and its structure was confirmed by FTIR, 1H NMR, and 30P NMR spectra and GPC. HPD was used as an additive flame retardant in epoxy resin, and its effect on the flame retardance and thermal properties of epoxy resin was studied. The epoxy resin with 7.5 wt% HPD reached UL‐94V‐0 rating and a higher LOI value of 29.6%, and its Tg was 176.2°C, which is higher than the pure epoxy resin. Moreover, the results of cone calorimetry testing (CCT) and TG‐FTIR analysis suggested that the gas‐phase and condensed‐phase flame‐retarded roles of HPD delayed the time to ignition, and reduced the value of relevant combustion parameters, including the peak of heat release rate, average of heat release rate, total heat release, smoke production rate, and total smoke production. The analysis results of Py‐GC/MS test of HPD further confirmed that HPD was able to play the flame‐retarded role in the gaseous and condensed phases.

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Section: Resultsmentioning

confidence: 82%

“…As is known to all, epoxy resins (EP) are vital thermosetting resins and have been widely used due to their excellent comprehensive performance 1‐3 . However, due to the flammability of EP, there exist potential fire hazards, and they are limited in many cutting‐edge applications where the high flame resistance is required.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of a hyperbranched polyamide oligomer containing DOPO for simultaneously enhancing the flame retardance and glass transition temperature of epoxy resin

Luo

Sun

et al. 2020

Polymers for Advanced Techs

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“…This defect seriously hinders EP's development and application [7]. The incorporation of flame retardants into EP can effectively alleviate this situation [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Effects of a Macromolecule Spirocyclic Inflatable Flame Retardant on the Thermal and Flame Retardant Properties of Epoxy Resin

et al. 2020

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A new strategy for the preparation of an integrated three-source intumescent flame retardant (IFR) has been developed to improve the flame-retardant and smoke suppression performance of epoxy resin (EP) with a synergistic flame retardant effect. Herein, the synthesis of a macromolecular spirocyclic phosphorus/nitrogen-containing IFR poly sulfonamide spirocyclic pentaerythritol bisphosphonate (SAPC) is reported via a two-step method that uses pentaerythritol, phosphorus oxychloride and sulfonamide (SAA) as raw materials. Subsequently, the SAPC was incorporated into EP to prepare the composite to investigate its thermal stability, flame retardancy, and smoke suppression performance. Herein, a differential scanning calorimetry (DSC) analysis showed that the addition of SAPC increased the glass transition temperature (Tg) of the composite. Cone test results indicated that the incorporation of 8 wt % SAPC significantly improved the flame-retardant performance for the composite, with a 43.45% decrease in peak of heat release rate, a 28.55% reduction in total heat release, and a 30.04% decrease in total smoke release. Additionally, the composite received the V-0 rating in a UL-94 vertical burning test, accompanied by the “blowout” phenomenon. After the addition of SAPC, the amount of flammable gas products from the EP composite decomposition was obviously suppressed, and the amount of non-flammable as was increased. All of this suggests a good dilution role of SAPC. There are enough reasons to believe that the enhanced flame-retardant and toxicity suppression performance for the EP composite can be attributed to the good coordination of carbonization agent, acid source, and blowing agent in the SAPC structure.

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“…[1][2][3][4][5] Unfortunately, its flammability is a destructive shortcoming in some applications. [6][7][8][9] Hence, EP needs to be modified with flame retardants (FRs) to meet the requirements of fire protection. Halogen-containing FRs used to be incorporated into EP to enhance its flame retardancy.…”

Section: Introductionmentioning

confidence: 99%

Flame retardancy and pyrolysis behavior of an epoxy resin composite flame‐retarded by diphenylphosphinyl‐POSS

Zhai

Xin

Li-yun

et al. 2020

Polymer Engineering & Sci

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To reduce the flammability of epoxy resin (EP), a flame retardant (designated as D‐POSS) containing diphenylphosphinyl and polyhedral oligomeric silsesquioxane (POSS) was constructed by aminopropyl‐isobutyl POSS and diphenylphosphinyl chloride. The chemical structure of D‐POSS was fully characterized, then it was used to enhance the flame retardancy of EP. When the flame‐retardant EP composite contained 4 wt% D‐POSS, its limiting oxygen index value was 29.0% and it achieved UL 94 V‐1 rating. Also, its peak of heat release rate (pk‐HRR), total heat release (THR) and total smoke production were decreased by 35.3%, 30.3%, and 38.3%, respectively. Moreover, the results from cone calorimeter disclosed that diphenylphosphinyl group and POSS group in D‐POSS showed a strong synergistic effect in inhibiting pk‐HRR, THR, and smoke production, promoting the charring formation of EP material, and forming an intumescent char layer. Additionally, the theoretical THR reduction of flame‐retardant EP composite was calculated by the equation deduced from the standard, and it was almost same with the practical THR reduction. Notably, some silicon oxide enriched on the residue's surface. The phenomenon led to form a double‐layer residue that consisted of white yarn‐like outer char and normal intumescent inner char. This double‐layer residue was contributed to enhance EP composite's flame retardancy.

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Synthesis of a novel dual layered double hydroxide hybrid nanomaterial and its application in epoxy nanocomposites

Cited by 124 publications

References 32 publications

Synthesis of a hyperbranched polyamide oligomer containing DOPO for simultaneously enhancing the flame retardance and glass transition temperature of epoxy resin

Synthesis of a hyperbranched polyamide oligomer containing DOPO for simultaneously enhancing the flame retardance and glass transition temperature of epoxy resin

Effects of a Macromolecule Spirocyclic Inflatable Flame Retardant on the Thermal and Flame Retardant Properties of Epoxy Resin

Flame retardancy and pyrolysis behavior of an epoxy resin composite flame‐retarded by diphenylphosphinyl‐POSS

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