Improvement of the thermal and thermo-oxidative stability of high-density polyethylene by free radical trapping of rare earth compound

Ran, Shiya; Li, Zhao; Han, Liang; Guo, Zhenghong; Fang, Zhengping

doi:10.1016/j.tca.2015.05.006

Cited by 15 publications

(14 citation statements)

References 40 publications

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“…The radical scavenging capacity can be determined by measuring and comparing the decrease of ESR signal intensity with the presence of GO or GHNT. The number of generated radicals is proportional to the intensity of the ESR signal . The ESR spectra with 5 mg GO or GHNT are displayed in Figure (b) (GO) and Figure (c) (GHNT).…”

Section: Resultsmentioning

confidence: 99%

Flame‐retardant cyanate ester resin with suppressed toxic volatiles based on environmentally friendly halloysite nanotube/graphene oxide hybrid

Zhang¹,

Xu²,

Yuan³

et al. 2018

J of Applied Polymer Sci

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Development of high‐performance thermosetting resins by adding environmentally friendly flame retardant to heat‐resistant resins without deteriorating their outstanding thermal stability is an important research direction. Here, a unique hybrid (GHNT) consisting of graphene oxide (GO) and halloysite nanotubes (HNT) was synthesized, and then a series of composites based on cyanate ester (CE) resin were fabricated. The effects of GHNT on the heat resistance, flame retardancy, and smoke suppression of GHNT/CE composites were intensively investigated. The GHNT/CE composite with 5.0 wt % GHNT not only has about 15.1 °C higher initial degradation temperature, but also shows 54.6% or 37.9% lower peak heat release rate or maximum smoke density than CE resin. These results clearly demonstrate that GHNT is not the simple combination of GO and HNT; instead, it obviously shows positive synergistic effects in simultaneously improving the flame retardancy and thermal resistance of CE resin. The improved flame retardancy could be attributed to condensed‐phase mechanisms, including increasing char yield, building a dense char layer, and free radical scavenging. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46587.

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Section: Resultsmentioning

confidence: 99%

Flame‐retardant cyanate ester resin with suppressed toxic volatiles based on environmentally friendly halloysite nanotube/graphene oxide hybrid

Zhang¹,

Xu²,

Yuan³

et al. 2018

J of Applied Polymer Sci

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“…to form the rare earth phosphonate with the layered crystal structure . Rare earth phosphonate had the ability of catalyzing charring as “acid sites” . And the decomposition of organic groups around layered crystals and the rupture of O‐P‐O bonds within layered crystals would produce PO· free radicals, which can trap H· and OH· to inhibit the fire spreading.…”

Section: Introductionmentioning

confidence: 99%

Synergistic flame retardant mechanism of lanthanum phenylphosphonate and decabromodiphenyl oxide in polycarbonate

Ran

Cai³

et al. 2018

Polymer Composites

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Lanthanum phenylphosphonate (LaHPP) was synthesized through solution reflux method with a hydrothermal reaction. The synergistic effect of decabromodiphenyl oxide (DBDPO) and LaHPP on thermal stability and flame retardancy of polycarbonate (PC) were investigated. Transmission electron microscope graphs showed that LaHPP dispersed well in the PC matrix. Thermogravimetric analyses indicated that the addition of LaHPP into PC/DBDPO composites led to better thermal stability. An appropriate content (1 wt%) of LaHPP could improve the UL94 rating (from V-2 to V-0) and limiting oxygen index value (from 32.8 to 40.5%) dramatically, and also brought an effective reduction in peak heat release rate and smoke release rate in cone calorimeter. Investigation of gaseous pyrolysis products and char residues demonstrated that LaHPP promoted the formation of more compact and solid chars, which acted as physical barriers to inhibit heat and oxygen transfer. The inside char layers also provided more space and time for DBDPO to play its flame retardant role in gaseous phases. POLYM.

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“…In fact, the thermal degradation of the polymer is a free-radical chain reaction; the radical-trapping ability is also an important factor in reducing the flammability of the polymer. 62 Besides, it was found that the OH • radical plays an important role in the whole thermal oxygen degradation mechanism of the polymer. 63 Thus, the adsorption energy of OH • on the final RE compounds that have direct contact with the flame can be used to evaluate the FR performance.…”

Section: Resultsmentioning

confidence: 99%

“…From the abovementioned discussion, we can conclude that compared with La-BTC and Ce-BTC, the excellent FR effect of Y-BTC is benefitted from the high stable carbon formation ability of Y which can prevent the heat transfer and the flame spread. In fact, the thermal degradation of the polymer is a free-radical chain reaction; the radical-trapping ability is also an important factor in reducing the flammability of the polymer . Besides, it was found that the OH • radical plays an important role in the whole thermal oxygen degradation mechanism of the polymer .…”

Section: Resultsmentioning

confidence: 99%

Comparative Study on the Flame Retardancy and Retarding Mechanism of Rare Earth (La, Ce, and Y)-Based Organic Frameworks on Epoxy Resin

Zhang

et al. 2021

ACS Omega

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In this work, a series of rare earth-based metal–organic frameworks (RE-MOFs) with the same organic ligand were synthesized and studied as flame retardants on epoxy. Through thermogravimetric analysis, limiting oxide index, UL-94, and cone calorimeter tests, a Y-based MOF (Y-MOF) showed the best flame retardancy compared with a La-based MOF (La-MOF) and Ce-based MOF (Ce-MOF). Further research with Raman, X-ray photoelectron spectroscopy, and theoretical calculation revealed that the reasons for the different flame retardance performances of RE-MOFs resulted from the catalytic carbonizing abilities and the radical-trapping abilities of La, Ce, and Y.

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Improvement of the thermal and thermo-oxidative stability of high-density polyethylene by free radical trapping of rare earth compound

Cited by 15 publications

References 40 publications

Flame‐retardant cyanate ester resin with suppressed toxic volatiles based on environmentally friendly halloysite nanotube/graphene oxide hybrid

Flame‐retardant cyanate ester resin with suppressed toxic volatiles based on environmentally friendly halloysite nanotube/graphene oxide hybrid

Synergistic flame retardant mechanism of lanthanum phenylphosphonate and decabromodiphenyl oxide in polycarbonate

Comparative Study on the Flame Retardancy and Retarding Mechanism of Rare Earth (La, Ce, and Y)-Based Organic Frameworks on Epoxy Resin

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