The Experts below are selected from a list of 315 Experts worldwide ranked by ideXlab platform
Yuan Hu - One of the best experts on this subject based on the ideXlab platform.
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the influence of highly dispersed cu2o anchored mos2 hybrids on reducing smoke toxicity and Fire Hazards for rigid polyurethane foam
Journal of Hazardous Materials, 2020Co-Authors: Yao Yuan, Lei Song, Wei Wang, Yuan HuAbstract:Abstract The extensive utilization of rigid polyurethane foam (RPUF) as construction insulation material has brought two main troubles to our society: Fire risks and toxic Hazards. To reduce the Fire Hazards of RPUF, a layered MoS2 decorated with Cu2O nanoparticles was creativity obtained by hydrothermal technology and facile wet chemical treatment for reducing the toxic product formations of polyurethane nanocomposites during combustion. Due to the low weight ratio of Cu2O attached onto MoS2, the resulting Cu2O-MoS2 hybrid effectively prevented the MoS2 nanosheets from restacking. However, the Cu2O-MoS2-M hybrid was produced by increasing content of Cu2O, which has the characteristic stacked layer structure of MoS2. Reduced harmful organic volatiles and the toxic gases (e.g. a respective decrease of ca. 28% and 53% for CO and NOx products) were obtained because of synergistic effect between the physical adsorption of MoS2 and catalysis action of Cu2O. Notably, the addition of Cu2O-MoS2 hybrids led to high char formation of the RPUF nanocomposite, indicating the effectively catalytic carbonization property. In addition, the N-Gas model for predicting Fire smoke toxicity was developed and demonstrated. Furthermore, the research offers direct proofs of the negative influence of the stacked MoS2 on reducing the smoke toxicity for RPUF nanocomposites.
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monitoring the degradation of physical properties and Fire Hazards of high impact polystyrene composite with different ageing time in natural environments
Journal of Hazardous Materials, 2018Co-Authors: Bibo Wang, Lei Song, Yan Zhang, Xia Zhou, Yuan HuAbstract:Abstract The current study aims at monitoring the role of the different natural environments on the physical properties and Fire Hazards of HIPS composites ageing in Turpan and Qionghai. The results indicated that the chromatic aberration and degradation of surface appearance intensified with the increasing ageing time. More flame retardants migrated and were eroded for HIPS composites ageing in Qionghai than those ageing in Turpan, which was caused by the combination of sunlight, high temperature and rainwater in Qionghai. After degradation in the natural environments, the HIPS composites possessed the lower thermal stability and char residues, more toxic gases release, higher peak heat release rate and Fire hazard. For example, the peak heat release rate in Qionghai increased by 88.9%, which is much higher than that of in Turpan (55.6%). Moreover, the tensile strength and elongation at break decreased by 46% and 59% for HIPS composites ageing in Turpan and reduced by 53% and 67% for HIPS composites aged in Qionghai, respectively. The results demonstrate that more serious degradation of physical properties and higher Fire hazard for HIPS composites ageing in Qionghai than those in Turpan due to the different natural ageing environments.
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mussel inspired functionalization of electrochemically exfoliated graphene based on self polymerization of dopamine and its suppression effect on the Fire Hazards and smoke toxicity of thermoplastic polyurethane
Journal of Hazardous Materials, 2018Co-Authors: Junling Wang, Xiaming Feng, Xin Wang, Xiaowei Mu, Bihe Yuan, Yuan HuAbstract:Abstract The suppression effect of graphene in the Fire Hazards and smoke toxicity of polymer composites has been seriously limited by both mass production and weak interfacial interaction. Though the electrochemical preparation provides an available approach for mass production, exfoliated graphene could not strongly bond with polar polymer chains. Herein, mussel-inspired functionalization of electrochemically exfoliated graphene was successfully processed and added into polar thermoplastic polyurethane matrix (TPU). As confirmed by SEM patterns of fracture surface, functionalized graphene possessing abundant hydroxyl could constitute a forceful chains interaction with TPU. By the incorporation of 2.0 wt % f-GNS, peak heat release rate (pHRR), total heat release (THR), specific extinction area (SEA), as well as smoke produce rate (SPR) of TPU composites were approximately decreased by 59.4%, 27.1%, 31.9%, and 26.7%, respectively. A probable mechanism of Fire retardant was hypothesized: well-dispersed f-GNS constituted tortuous path and hindered the exchange process of degradation product with barrier function. Large quantities of degradation product gathered round f-GNS and reacted with flame retardant to produce the cross-linked and high-degree graphited residual char. The simple functionalization for electrochemically exfoliated graphene impels the application of graphene in the fields of flame retardant composites.
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integrated effect of supramolecular self assembled sandwich like melamine cyanurate mos2 hybrid sheets on reducing Fire Hazards of polyamide 6 composites
Journal of Hazardous Materials, 2016Co-Authors: Xiaming Feng, Yuan Hu, Xin Wang, Ningning Hong, K M LiewAbstract:Abstract A novel strategy of using supramolecular self-assembly for preparing sandwich-like melamine cyanurate/MoS2 sheets as the hybrid flame retardants for polyamide 6 (PA6) is reported for the first time. The introduction of MoS2 sheets function not only as a template to induce the formation of two-dimensional melamine cyanurate capping layers but also as a synergist to generate integrated flame-retarding effect of hybrid sheets, as well as a high-performance smoke suppressor to reduce Fire Hazards of PA6 materials. Once incorporating this well-designed structures (4 wt%) into PA6 matrix, there resulted in a remarkable drop (40%) in the peak heat release rate and a 25% reduction in total heat release. Moreover, the smoke production and pyrolysis gaseous products were efficiently suppressed by the addition of sandwich-like hybrid sheets. The integrated functions consisting of inherent flame retarding effect, physical barrier performance and catalytic activity are believed to the crucial guarantee for the reduced Fire Hazards of PA6 nanocomposites. Furthermore, this novel strategy with facile and scalable features may provide reference for developing various kinds of MoS2 based hybrid sheets for diverse applications.
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in situ loading ultra small cu2o nanoparticles on 2d hierarchical tio2 graphene oxide dual nanosheets towards reducing Fire Hazards of unsaturated polyester resin
Journal of Hazardous Materials, 2016Co-Authors: Dong Wang, Lei Song, Xiaojuan Yu, Yuan HuAbstract:Abstract Fire Hazards have seriously hindered the commercial application of unsaturated polyester resin (UPR), and polymer inorganic nanosheet nanocomposites hold great promise in improving their flame-retardant properties. Herein, the hierarchical structured Cu 2 O TiO 2 GO nanosheets were synthesized and characterized by XRD, Raman, TEM and XPS. Then Cu 2 O TiO 2 GO nanosheets were incorporated into UPR matrix to obtain flame-retardant UPR nanocomposite. Incorporation of 2 wt% Cu 2 O TiO 2 GO nanosheets into UPR matrix resulted in an obvious reduction in PHRR and THR by 29.7 and 19.1%. TG-IR-MS results revealed that toxic pyrolysis gas such as benzene, CO and aromatic compounds greatly were decreased. In addition, RIIR spectra demonstrated the limited influence of Cu 2 O TiO 2 GO nanosheets on thermal degradation of UPR matrix, and SEM images of char residues showed that Cu 2 O TiO 2 GO nanosheets could improve their compactness. Based on the analysis of gaseous and condensed phase, a plausible flame-retardant mechanism was hypothesized to elaborate how Cu 2 O TiO 2 GO nanosheets work inside the flaming UPR nanocomposite. This innovative idea may be expanded to other polymer system and open a new door to develop polymeric nanocomposites with high performance.
Keqing Zhou - One of the best experts on this subject based on the ideXlab platform.
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estimating the feasibility of using industrial solid wastes as raw material for polyurethane composites with low Fire Hazards
Journal of Cleaner Production, 2020Co-Authors: Keqing Zhou, Kaili Gong, Qianqian Zhou, Sijia Zhao, Xiaodong QianAbstract:Abstract Solid wastes including phosphate tailings (PT) and fly ash (FA) are by-products with large quantities and deposited in surface impoundment without treatment, which can easily trigger environment issues. The comprehensive utilization of industrial solid wastes has received intensive attention. In present work, the recycling of industrial solid wastes was studied to explore the probability of utilizing PT and FA as fillers for fabrication of polymer materials with low Fire Hazards. The micro-sized PT and FA powders were firstly treated with silane coupling agents and then introduced into thermoplastic polyurethane (TPU) through solvent blending method. The influences of solid wastes on the thermal degradation behavior, as well as the Fire Hazards of TPU were explored. The thermogravimetric analysis results illustrated that due to the introduction of PT and FA, the thermal degradation rate was reduced while the thermal degradation temperature and char yields were increased, in contrast to pristine TPU. The cone calorimetry test results demonstrated the introduction of PT and FA obviously reduced the heat release rate (HRR), total heat release (THR), smoke production rate (SPR), total smoke release (TSR), carbon monoxide (CO) and carbon dioxide (CO2) emission rate of TPU composites. Therefore, the PT and FA might be promising fillers for fabrication of polymeric materials with controllable properties and provide a novel solution for effective recycling of industrial solid wastes.
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the influence of cerium dioxide functionalized reduced graphene oxide on reducing Fire Hazards of thermoplastic polyurethane nanocomposites
Journal of Colloid and Interface Science, 2019Co-Authors: Shuguang Wang, Keqing ZhouAbstract:Abstract In this work, CeO2/rGO hybrids were successfully synthesized by a facile one-step hydrothermal method to reduce Fire Hazards of thermoplastic polyurethane. The structure, element components and morphology of the synthesized products were characterized by XRD, FTIR, Raman spectra and TEM. Then, 2.0 wt% CeO2/rGO hybrids were incorporated into thermoplastic polyurethane matrix (TPU) to improve thermal stability, flame retardancy and smoke toxicity suppression. The introduction of CeO2/rGO hybrids could remarkably suppress heat release and smoke release, indicated by the reduction of the peak heat release rate, smoke produce rate, as well as the release rate of CO and CO2. The significant improvement in thermal stability and smoke suppression properties was mainly due to the synergistic function between physical barrier effect of rGO and catalytic effect of CeO2. This work provided an effect way to enhance the thermal stability and Fire safety of TPU.
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polyaniline a novel bridge to reduce the Fire Hazards of epoxy composites
Composites Part A-applied Science and Manufacturing, 2018Co-Authors: Keqing ZhouAbstract:Abstract As a graphene-like two dimensional nanomaterial, MoS2 had been considered as promising nanofillers for fabrication of polymer-based materials with high performances. However, its dispersion and functionalization represented a critical challenge. In present work, polyaniline (PANI) coating was successfully grown on the surface of exfoliated MoS2 nanosheets by in situ polymerization method in order to improve the dispersion quality and interfacial interactions between MoS2 and polymer matrix. The obtained PANI-MoS2 hybrids were characterized through XRD, Raman spectrum, FTIR, TGA, XPS, TEM and further introduced into epoxy matrix. It was clearly observed that the addition of a PANI coating not only improved the dispersion of MoS2 in the matrix and the interfacial bonding between MoS2 and epoxy, but also obviously reduced the Fire Hazards of epoxy. By adding 2 wt% PANI-MoS2, the peak heat release rate and total heat release values of epoxy composites were remarkably reduced by 49% and 22%, respectively, in comparison with those of neat epoxy. In addition, the amount of smoke produced and toxic CO released was inhibited obviously. The well dispersion, labyrinth barrier effect, catalytic charring effect of PANI-MoS2 hybrids and combination effect between PANI and MoS2 were believed to the primary source for the remarkable improvement of Fire safety.
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in situ growth of 0d silica nanospheres on 2d molybdenum disulfide nanosheets towards reducing Fire Hazards of epoxy resin
Journal of Hazardous Materials, 2018Co-Authors: Keqing Zhou, Gang Tang, Shudong JiangAbstract:Abstract This report described a facile process for the preparation of 2D/0D MoS2-SiO2 hybrids using a simple in situ growth method, with the purpose of promoting the dispersion of MoS2 in polymer matrices and improving the properties of polymer materials. FTIR, XPS, TGA and TEM measurements were performed to characterize the structure and morphology of the synthesized hybrids which were then introduced into epoxy to reduce flammability. The hybrids dispersed well in the epoxy matrix. No obvious agglomerations were observed. In comparison with those of neat epoxy, the incorporation of a low loading of MoS2-SiO2 hybrids resulted in significant decrements in heat release rate, total heat release and volume of toxic effluents released during combustion, which indicated that the Fire Hazards of epoxy composites were strongly reduced. The good dispersion, labyrinth barrier effect and the catalytic effect of MoS2-SiO2 hybrids on char formation may contribute to the observed decrease in the flammability of epoxy resin.
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self assembly of exfoliated molybdenum disulfide mos2 nanosheets and layered double hydroxide ldh towards reducing Fire Hazards of epoxy
Journal of Hazardous Materials, 2017Co-Authors: Keqing Zhou, Xiaodong QianAbstract:In present study, LDH/MoS2 hybrids were facilely prepared by self-assembly of exfoliated MoS2 nanosheets and LDH via electrostatic force. The structure and morphology of the LDH/MoS2 hybrids were characterized and then introduced into epoxy for reducing its Fire Hazards. Compared with single MoS2, LDH/MoS2 hybrids showed a more homogeneous dispersion in the epoxy matrix and no obvious agglomerates were observed. Compared with MoS2, the addition of LDH/MoS2 hybrids endowed more excellent Fire resistance to epoxy matrix, which was reflected by the significantly reduced peak heat release rate, total heat release and total smoke production. A rational flame retardant mode of action for LDH/MoS2 hybrids was proposed based on the analysis of pyrolysis fragments and char residues.
Lei Song - One of the best experts on this subject based on the ideXlab platform.
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the influence of highly dispersed cu2o anchored mos2 hybrids on reducing smoke toxicity and Fire Hazards for rigid polyurethane foam
Journal of Hazardous Materials, 2020Co-Authors: Yao Yuan, Lei Song, Wei Wang, Yuan HuAbstract:Abstract The extensive utilization of rigid polyurethane foam (RPUF) as construction insulation material has brought two main troubles to our society: Fire risks and toxic Hazards. To reduce the Fire Hazards of RPUF, a layered MoS2 decorated with Cu2O nanoparticles was creativity obtained by hydrothermal technology and facile wet chemical treatment for reducing the toxic product formations of polyurethane nanocomposites during combustion. Due to the low weight ratio of Cu2O attached onto MoS2, the resulting Cu2O-MoS2 hybrid effectively prevented the MoS2 nanosheets from restacking. However, the Cu2O-MoS2-M hybrid was produced by increasing content of Cu2O, which has the characteristic stacked layer structure of MoS2. Reduced harmful organic volatiles and the toxic gases (e.g. a respective decrease of ca. 28% and 53% for CO and NOx products) were obtained because of synergistic effect between the physical adsorption of MoS2 and catalysis action of Cu2O. Notably, the addition of Cu2O-MoS2 hybrids led to high char formation of the RPUF nanocomposite, indicating the effectively catalytic carbonization property. In addition, the N-Gas model for predicting Fire smoke toxicity was developed and demonstrated. Furthermore, the research offers direct proofs of the negative influence of the stacked MoS2 on reducing the smoke toxicity for RPUF nanocomposites.
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monitoring the degradation of physical properties and Fire Hazards of high impact polystyrene composite with different ageing time in natural environments
Journal of Hazardous Materials, 2018Co-Authors: Bibo Wang, Lei Song, Yan Zhang, Xia Zhou, Yuan HuAbstract:Abstract The current study aims at monitoring the role of the different natural environments on the physical properties and Fire Hazards of HIPS composites ageing in Turpan and Qionghai. The results indicated that the chromatic aberration and degradation of surface appearance intensified with the increasing ageing time. More flame retardants migrated and were eroded for HIPS composites ageing in Qionghai than those ageing in Turpan, which was caused by the combination of sunlight, high temperature and rainwater in Qionghai. After degradation in the natural environments, the HIPS composites possessed the lower thermal stability and char residues, more toxic gases release, higher peak heat release rate and Fire hazard. For example, the peak heat release rate in Qionghai increased by 88.9%, which is much higher than that of in Turpan (55.6%). Moreover, the tensile strength and elongation at break decreased by 46% and 59% for HIPS composites ageing in Turpan and reduced by 53% and 67% for HIPS composites aged in Qionghai, respectively. The results demonstrate that more serious degradation of physical properties and higher Fire hazard for HIPS composites ageing in Qionghai than those in Turpan due to the different natural ageing environments.
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in situ loading ultra small cu2o nanoparticles on 2d hierarchical tio2 graphene oxide dual nanosheets towards reducing Fire Hazards of unsaturated polyester resin
Journal of Hazardous Materials, 2016Co-Authors: Dong Wang, Lei Song, Xiaojuan Yu, Yuan HuAbstract:Abstract Fire Hazards have seriously hindered the commercial application of unsaturated polyester resin (UPR), and polymer inorganic nanosheet nanocomposites hold great promise in improving their flame-retardant properties. Herein, the hierarchical structured Cu 2 O TiO 2 GO nanosheets were synthesized and characterized by XRD, Raman, TEM and XPS. Then Cu 2 O TiO 2 GO nanosheets were incorporated into UPR matrix to obtain flame-retardant UPR nanocomposite. Incorporation of 2 wt% Cu 2 O TiO 2 GO nanosheets into UPR matrix resulted in an obvious reduction in PHRR and THR by 29.7 and 19.1%. TG-IR-MS results revealed that toxic pyrolysis gas such as benzene, CO and aromatic compounds greatly were decreased. In addition, RIIR spectra demonstrated the limited influence of Cu 2 O TiO 2 GO nanosheets on thermal degradation of UPR matrix, and SEM images of char residues showed that Cu 2 O TiO 2 GO nanosheets could improve their compactness. Based on the analysis of gaseous and condensed phase, a plausible flame-retardant mechanism was hypothesized to elaborate how Cu 2 O TiO 2 GO nanosheets work inside the flaming UPR nanocomposite. This innovative idea may be expanded to other polymer system and open a new door to develop polymeric nanocomposites with high performance.
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the influence of zinc hydroxystannate on reducing toxic gases co nox and hcn generation and Fire Hazards of thermoplastic polyurethane composites
Journal of Hazardous Materials, 2016Co-Authors: Bibo Wang, Yuan Hu, Lei Song, Haibo Sheng, Yan Zhang, Weizhao HuAbstract:A uniform zinc hydroxystannate (ZnHS) microcube was synthesized to reduce toxicity and Fire Hazards of thermoplastic polyurethane (TPU) composites using ammonium polyphosphate as a flame retardant agent. The structure, morphology and thermal properties of ZnHS were characterized by X-ray diffraction, transmission electron microscopy and thermogravimetric analysis, respectively. Smoke suppression properties and synergistic flame retardant effect of ZnHS on flame retardant TPU composites were intensively investigated by smoke density test, cone calorimeter test, and thermalgravimetric analysis. Thermogravimetric analysis/infrared spectrometry and tube furnace were employed to evaluate the toxic gases (CO, NOx and HCN) of TPU composites. The incorporation of ZnHS into TPU matrix effectively improved the Fire safety and restrained the smoke density, which is attributed to that the char residue catalyzed by ZnHS enhanced barrier effect that reduced peak heat release rate, total heat release, smoke particles and organic volatiles during combustion. Furthermore, the ZnHS synergist demonstrated high efficiency in catalytic degradation of the toxic gases, which obviously decreased total volatiled product and toxic volatiles evolved, such as the CO, HCN and NOx, indicating suppressed toxicity of the TPU composites.
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simultaneous reduction and surface functionalization of graphene oxide with poss for reducing Fire Hazards in epoxy composites
Journal of Materials Chemistry, 2012Co-Authors: Xin Wang, Lei Song, Hongyu Yang, Weiyi Xing, Baljinder K Kandola, Yuan HuAbstract:Simultaneous reduction and surface functionalization of graphene oxide (GO) was realized by simple refluxing of GO with octa-aminophenyl polyhedral oligomeric silsesquioxanes (OapPOSS) without the use of any reducing agents. The presence of OapPOSS made the hydrophilic GO hydrophobic, as evidenced by the good dispersion of the OapPOSS-reduced GO (OapPOSS-rGO) in tetrahydrofuran solvent. The structure of OapPOSS-rGO was confirmed by XPS, FTIR and TEM. A morphological study showed that, due to the good interfacial interaction between the functionalized graphene and epoxy, OapPOSS-rGO was dispersed well in the matrix. With the incorporation of 2.0 wt% of OapPOSS-rGO, the onset thermal degradation temperature of the epoxy composite was significantly increased by 43 °C. Moreover, the peak heat release rate, total heat release and CO production rate values of OapPOSS-rGO/EP were significantly reduced by 49%, 37% and 58%, respectively, compared to those of neat epoxy. This dramatically reduced Fire Hazards was mainly attributed to the synergestic effect of OapPOSS-rGO: the adsorption and barrier effect of reduced graphene oxide inhibited the heat and gas release and promoted the formation of graphitized carbons, while OapPOSS improved the thermal oxidative resistance of the char layer.
Robert G Loeb - One of the best experts on this subject based on the ideXlab platform.
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laser surgery and Fire Hazards in ear nose and throat surgeries
Anesthesiology Clinics, 2010Co-Authors: David S Sheinbein, Robert G LoebAbstract:: Operating room Fires are rare but can be devastating. These Fires can occur during almost any surgical procedure but are more likely during airway surgery, during head and neck surgery, and if volatile flammable liquids are used. Each team in the operating room (ie, anesthesia, surgery, and nursing) has special expertise and responsibility in preventing and responding to a Fire. Fires can be prevented by ongoing education and an interdisciplinary discussion of risks and responsibilities prior to each high-risk case.
Bibo Wang - One of the best experts on this subject based on the ideXlab platform.
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monitoring the degradation of physical properties and Fire Hazards of high impact polystyrene composite with different ageing time in natural environments
Journal of Hazardous Materials, 2018Co-Authors: Bibo Wang, Lei Song, Yan Zhang, Xia Zhou, Yuan HuAbstract:Abstract The current study aims at monitoring the role of the different natural environments on the physical properties and Fire Hazards of HIPS composites ageing in Turpan and Qionghai. The results indicated that the chromatic aberration and degradation of surface appearance intensified with the increasing ageing time. More flame retardants migrated and were eroded for HIPS composites ageing in Qionghai than those ageing in Turpan, which was caused by the combination of sunlight, high temperature and rainwater in Qionghai. After degradation in the natural environments, the HIPS composites possessed the lower thermal stability and char residues, more toxic gases release, higher peak heat release rate and Fire hazard. For example, the peak heat release rate in Qionghai increased by 88.9%, which is much higher than that of in Turpan (55.6%). Moreover, the tensile strength and elongation at break decreased by 46% and 59% for HIPS composites ageing in Turpan and reduced by 53% and 67% for HIPS composites aged in Qionghai, respectively. The results demonstrate that more serious degradation of physical properties and higher Fire hazard for HIPS composites ageing in Qionghai than those in Turpan due to the different natural ageing environments.
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the influence of zinc hydroxystannate on reducing toxic gases co nox and hcn generation and Fire Hazards of thermoplastic polyurethane composites
Journal of Hazardous Materials, 2016Co-Authors: Bibo Wang, Yuan Hu, Lei Song, Haibo Sheng, Yan Zhang, Weizhao HuAbstract:A uniform zinc hydroxystannate (ZnHS) microcube was synthesized to reduce toxicity and Fire Hazards of thermoplastic polyurethane (TPU) composites using ammonium polyphosphate as a flame retardant agent. The structure, morphology and thermal properties of ZnHS were characterized by X-ray diffraction, transmission electron microscopy and thermogravimetric analysis, respectively. Smoke suppression properties and synergistic flame retardant effect of ZnHS on flame retardant TPU composites were intensively investigated by smoke density test, cone calorimeter test, and thermalgravimetric analysis. Thermogravimetric analysis/infrared spectrometry and tube furnace were employed to evaluate the toxic gases (CO, NOx and HCN) of TPU composites. The incorporation of ZnHS into TPU matrix effectively improved the Fire safety and restrained the smoke density, which is attributed to that the char residue catalyzed by ZnHS enhanced barrier effect that reduced peak heat release rate, total heat release, smoke particles and organic volatiles during combustion. Furthermore, the ZnHS synergist demonstrated high efficiency in catalytic degradation of the toxic gases, which obviously decreased total volatiled product and toxic volatiles evolved, such as the CO, HCN and NOx, indicating suppressed toxicity of the TPU composites.