Synthesis of a novel hyperbranched and phosphorus‐containing charring‐foaming agent and its application in polypropylene

Zhu, Changjiang; He, Mengyuan; Cui, Jianguang; Tai, Qilong; Song, Lei; Hu, Yuan

doi:10.1002/pat.4355

Cited by 29 publications

(10 citation statements)

References 31 publications

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“…For PhPOCl 2 , the strong absorption band at 1439 and 1270 cm –1 can be assigned to the P–Ph and P=O stretching vibration modes, respectively. The peaks at 680–750 cm –1 are the characteristic signal of the benzene ring . But we did not observe any of these typical peaks of PhPOCl 2 on the CsPbCl 3 NC sample.…”

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confidence: 60%

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Narrow-Band Violet-Light-Emitting Diodes Based on Stable Cesium Lead Chloride Perovskite Nanocrystals

et al. 2021

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CsPbCl3 nanocrystals are potential ultrapure emitters. But it is challenging to synthesize CsPbCl3 nanocrystals with sufficient stability, which impedes their application in light-emitting devices. In this work, we report a facile phosphoryl-chemistry-mediated synthesis approach to synthesizing stable CsPbCl3 nanocrystals, in which the phenylphosphonic dichloride (PhPOCl2) precursor is employed. In addition to the high reactivity of the P–Cl bond of PhPOCl2 for providing adequate Cl, the derived P=O with good proton affinity facilitates the formation of a distinct nanocrystal surface with the nonprotonated oleylamine (OLA) ligand. Accordingly, the L-type-ligand-capped CsPbCl3 nanocrystals exhibited not only bright luminance but also good stability that endured repeated purification up to 10 cycles. Based on the stable CsPbCl3 nanocrystals, we achieved violet LEDs with extremely narrow electroluminescence spectra (full width at half-maximum ≈ 10.6 nm).

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confidence: 60%

“…The peaks at 680−750 cm −1 are the characteristic signal of the benzene ring. 52 But we did not observe any of these typical peaks of PhPOCl 2 on the CsPbCl 3 NC sample. These results suggest that the PhPOCl 2 precursor was absent on the NC and thus exclude the possible passivation effect of P=O on the CsPbCl 3 NC surface.…”

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confidence: 53%

Narrow-Band Violet-Light-Emitting Diodes Based on Stable Cesium Lead Chloride Perovskite Nanocrystals

et al. 2021

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“…In order to improve the fire resistance of the PP matrix, phosphorus-, silicon-or nitrogen-based flame retardants are usually added into the matrix. The intumescent flame retardants (IFR) composed of charring agents, a gas source and acid sources have attracted Polymers 2022, 14, 2372 2 of 17 interest because of their anti-dripping, low toxicity, low smoke and eco-friendly characteristics [6,7]. Nevertheless, the common IFRs have some apparent disadvantages [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Synergistic Effects of DOPO-Based Derivative and Organo-Montmorillonite on Flame Retardancy, Thermal Stability and Mechanical Properties of Polypropylene

Huang

Wang

et al. 2022

Polymers

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Polypropylene (PP), as a general thermoplastic polymer, is broadly used in different fields. However, the high flammability, melt dripping and poor mechanical properties of PP are a constraint to the expansion of its applications. In this paper, PP composites containing a combination of a phenethyl-bridged DOPO derivative (PN-DOPO) and organic montmorillonite (OMMT) were prepared via melt blending. The synergistic effects of PN-DOPO and OMMT on the flame retardancy, thermal stability and mechanical properties of PP composites were investigated systematically. The results showed that 20 wt% addition of PN-DOPO with OMMT improved the flame retardancy of PP composites. In particular, the introduction of 17 wt% PN-DOPO and 3 wt% OMMT increased the LOI values of the PP matrix from 17.2% to 23.6%, and the sample reached the V-0 level and reduced the heat release rate and total heat release. TGA indicated that OMMT could improve the thermal stability of the PP/PN-DOPO blends and promote the char residues of PP systems. Rheological behaviour showed a higher storage modulus, loss modulus and complex viscosity of PP/PN-DOPO/OMMT composites, suggesting a more effective network structure. In addition, the tensile strength, flexural properties and impact strength of the PP/PN-DOPO/OMMT composites actually increased for a good dispersion effect. Combined with the char layer analysis, the introduction of OMMT promoted more continuous and compact structural layers containing an aluminium–silicon barrier and phosphorus-containing carbonaceous char in the condensed phase. OMMT can improve the flame retardancy, thermal stability and mechanical properties of PP, and, thus, PN-DOPO/OMMT blends can serve as an efficient synergistic system for flame-retarded PP composites.

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“…Many studies have been conducted on the addition of flame retardants to PP to restrict its flammability [4][5][6][7][8][9][10]. Among the commonly used flame retardants for PP, intumescent flame retardants (IFRs) have a high flame-retardant efficiency for relatively low loadings [9,[11][12][13][14][15][16]. Moreover, as they have little impact on the mechanical properties of the PP matrix, and satisfy the halogen-free environmental protection requirements, IFRs have been subject to considerable research and use in many applications.…”

Section: Introductionmentioning

confidence: 99%

Flame Retardancy Performance of Continuous Glass-Fiber-Reinforced Polypropylene Halogen-Free Flame-Retardant Prepreg

Sun

2022

Coatings

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Thermoplastic resin matrix has a high melt viscosity, which is difficult to impregnate with fibers. The addition of flame retardant will further increase the viscosity of the melt and increase the difficulty of impregnation. It is possible to reduce the effect of flame retardant on melt viscosity by adding high-flow polypropylene. In this study, the effect of adding flame retardant on the impregnation quality of prepreg tape was investigated. By adding high-flow polypropylene to improve the melt viscosity of flame-retardant-modified polypropylene, continuous glass-fiber-reinforced polypropylene flame-retardant prepreg tape was successfully prepared. Intumescent flame retardant (IFR) was added at 20 wt%, 25 wt%, 30 wt% of the polypropylene matrixes, which were prepared by melt impregnation. The composites were analyzed with thermogravimetric analysis, limiting oxygen index testing, UL-94 flame retardancy testing, cone calorimeter testing (CCT) and scanning electron microscopy. Tests involving the flame retardant showed that when the added amount of flame retardant reached 25%, the UL-94 flame retardancy grade reached V0. Compared with the CCT sample heating data, taking economic considerations into account, 25 wt% IFR addition was the most suitable.

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Synthesis of a novel hyperbranched and phosphorus‐containing charring‐foaming agent and its application in polypropylene

Cited by 29 publications

References 31 publications

Narrow-Band Violet-Light-Emitting Diodes Based on Stable Cesium Lead Chloride Perovskite Nanocrystals

Narrow-Band Violet-Light-Emitting Diodes Based on Stable Cesium Lead Chloride Perovskite Nanocrystals

Synergistic Effects of DOPO-Based Derivative and Organo-Montmorillonite on Flame Retardancy, Thermal Stability and Mechanical Properties of Polypropylene

Flame Retardancy Performance of Continuous Glass-Fiber-Reinforced Polypropylene Halogen-Free Flame-Retardant Prepreg

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