An intramolecular hybrid of metal polyhedral oligomeric silsesquioxanes with special titanium-embedded cage structure and flame retardant functionality

Wu, Haiyang; Zeng, Birong; Chen, Jinmei; Wu, Tong; Li, Yuntong; Liu, Yongzhou; Dai, Lizong

doi:10.1016/j.cej.2019.06.027

Cited by 110 publications

(66 citation statements)

References 55 publications

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“…The effect of PPO and DT flame retardant on the fire behavior of PA composites was investigated by cone calorimetry (CCT) at 35 kW/m 2 heat flux 34 . The results of pure PA66, PA composite‐0DT, and PA composite‐6DT are presented in Figure 5(a, b) and Table 4, respectively.…”

Section: Resultsmentioning

confidence: 99%

The synthesis of meltable and highly thermostable triazine‐DOPO flame retardant and its application in PA66

Guo

Bao

2020

Polymers for Advanced Techs

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A melting phosphorous‐nitrogen flame retardant was synthesized via the addition reaction of 9,10‐dihydro‐9‐oxa‐10‐phosphaphenanthrene‐10‐oxide (DOPO) and 2,4,6‐triallyloxy‐1,3,5‐triazine (TAC). The synthesized product from DOPO and TAC (DT) flame retardant possesses high thermal stability with T5wt% at 340°C, which can meet the high‐temperature processing for polyamide 6,6 (PA66) and other engineering plastics. The chemical structures of DT were characterized by nuclear magnetic resonance and infrared spectrometry. The PA composites were fabricated via blending PA66 with DT and poly‐phenyl ether (PPO) as charring agent. The results show that the PA composites exhibit strong flame retardancy with limited oxygen index reaching to 29.0%. As compared to the neat PA66, the total heat release and the effective heat of combustion were decreased by 27% and 21%, respectively. The mechanism study revealed that the thermal cleavage of DT gave the phosphorus‐containing free radicals and incombustible nitrogen‐containing gas, indicating the ability of DT to flame‐inhibition in the gas phase. Moreover, the char formation of the PA66‐based composites was facilitated by the synergistic effect from DT and PPO. This study may gain a potential technical route to manufacture the flame‐retardant PA66 materials for the melt spinning of fibers.

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Section: Resultsmentioning

confidence: 99%

The synthesis of meltable and highly thermostable triazine‐DOPO flame retardant and its application in PA66

Guo

Bao

2020

Polymers for Advanced Techs

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“…It can be seen that for VE-2 and VE-2-2, the main elements in the char layers are carbon and oxygen, and a small amount of P and Si. Compared with VE-2, new signals belonging to Ti element appeared in VE-2-2, and the content of P and Si elements increased evidently It can be inferred that the addition of Ti element into the VE composites was beneficial to the formation of dense and stable char layer, and different Ti containing compounds may be formed during combustion [53,61,62], which was helpful to improve the fire resistance The exterior residual char VE-2 and VE-2-2 were studied by XPS to further investigate the mechanism of char formation. Figure 11a [53,70], respectively In the O1s spectrum of VE-2-2 (Figure 11f), there are four peaks at 530.9 eV, 531.8 eV, 532.6 The exterior residual char VE-2 and VE-2-2 were studied by XPS to further investigate the mechanism of char formation.…”

Section: Flame Retardant Properties Of the Ve Compositesmentioning

confidence: 95%

“…Compared with VE-2, new signals belonging to Ti element appeared in VE-2-2, and the content of P and Si elements increased evidently. It can be inferred that the addition of Ti element into the VE composites was beneficial to the formation of dense and stable char layer, and different Ti containing compounds may be formed during combustion [53,61,62], which was helpful to improve the fire resistance. To further explore the flame retardant mechanism in condensed phase, the exterior and interior residual chars of VE-2 and VE-2-2 are studied by EDX analysis (Figure 10).…”

Section: Flame Retardant Properties Of the Ve Compositesmentioning

confidence: 99%

Synergistic Effects of Ladder and Cage Structured Phosphorus-Containing POSS with Tetrabutyl Titanate on Flame Retardancy of Vinyl Epoxy Resins

et al. 2021

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The cage and ladder structured phosphorus-containing polyhedral oligomeric silsesquioxanes (DOPO-POSS) have been synthesized through the hydrolytic condensation of 9,10-dihydro-9-oxa-10-phosphenanthrene-10-oxide (DOPO)-vinyl triethoxysilane (VTES). The unique ladder and cage–ladder structured components in DOPO-POSS endowed it with good solubility in vinyl epoxy resin (VE), and it was used with tetrabutyl titanate (TBT) to construct a phosphorus-silicon-titanium synergy system for the flame retardation of VE. Thermal stabilities, mechanical properties, and flame retardancy of the resultant VE composites were investigated by thermal gravimetric analysis (TGA), dynamic mechanical analysis (DMA), three-point bending tests, limiting oxygen index (LOI) measurement, and cone calorimetry. The experimental results showed that with the addition of only 4 wt% DOPO-POSS and 0.5 wt% TBT, the limiting oxygen index value (LOI) increased from 19.5 of pure VE to 24.2. With the addition of DOPO-POSS and TBT, the peak heat release rate (PHRR), total heat release (THR), smoke production rate (SPR), and total smoke production (TSP) were decreased significantly compared to VE-0. In addition, the VE composites showed improved thermal stabilities and mechanical properties comparable to that of the VE-0. The investigations on pyrolysis volatiles of cured VE further revealed that DOPO-POSS and TBT exerted flame retardant effects in gas phase. The results of char residue of the VE composites by SEM and XPS showed that TBT and DOPO-POSS can accelerate the char formation during the combustion, forming an interior char layer with the honeycomb cavity structure and dense exterior char layer, making the char strong with the formation of Si-O-Ti and Ti-O-P structures.

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“…In addition, surface functionalization of inorganic substrate materials can also be accomplished by a one‐step KF reaction. [ 115–117 ] The preparation of functional polymers with AIE properties through KF reaction was first presented by Long et al. [ 118 ] They showed that KF reaction can be used as a clean coupling reaction for fabrication of functional luminescent copolymers with economical, green, and high‐yield.…”

Section: Fabrication Of Fluorescent Copolymers With Aie Feature Throumentioning

confidence: 99%

Recent Advances on Fabrication of Polymeric Composites Based on Multicomponent Reactions for Bioimaging and Environmental Pollutant Removal

Yang

Liang

et al. 2021

Macromol. Rapid Commun.

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As the core of polymer chemistry, manufacture of functional polymers is one of research hotspots over the past several decades. Various polymers are developed for diverse applications due to their tunable structures and unique properties. However, traditional step‐by‐step preparation strategies inevitably involve some problems, such as separation, purification, and time‐consuming. The multicomponent reactions (MCRs) are emerging as environmentally benign synthetic strategies to construct multifunctional polymers or composites with pendant groups and designed structures because of their features, such as efficient, fast, green, and atom economy. This mini review summarizes the latest advances about fabrication of multifunctional fluorescent polymers or adsorptive polymeric composites through different MCRs, including Kabachnik–Fields reaction, Biginelli reaction, mercaptoacetic acid locking imine reaction, Debus–Radziszewski reaction, and Mannich reaction. The potential applications of these polymeric composites in biomedical and environmental remediation are also highlighted. It is expected that this mini‐review will promote the development preparation and applications of functional polymers through MCRs.

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An intramolecular hybrid of metal polyhedral oligomeric silsesquioxanes with special titanium-embedded cage structure and flame retardant functionality

Cited by 110 publications

References 55 publications

The synthesis of meltable and highly thermostable triazine‐DOPO flame retardant and its application in PA66

The synthesis of meltable and highly thermostable triazine‐DOPO flame retardant and its application in PA66

Synergistic Effects of Ladder and Cage Structured Phosphorus-Containing POSS with Tetrabutyl Titanate on Flame Retardancy of Vinyl Epoxy Resins

Recent Advances on Fabrication of Polymeric Composites Based on Multicomponent Reactions for Bioimaging and Environmental Pollutant Removal

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