Peak Heat Release Rate Value Research Articles

In-situ synthesis and assembly of nanospheres (Py1H2PW, Py2H1PW, and Py3PW) in wood to promote flame retardation

Hybrid wood is a composite with the advantages of both wood and inorganic material. Here, a novel hybrid wood was fabricated from wood and nanospheres by the in-situ assembly of phosphotungstic acid (HPW) and pyridine (PY) at room temperature. The uniformly distributed amphiphilic PY-PW nanospheres provided controllable particle size and acid properties by changing the HPW-PY molar. Examination under Scanning electron microscopy (SEM) showed the presence of a uniform nanosphere coating by the nanospheres, and FE-SEM/EDS showed even distribution on the cell walls. The successful synthesis of the nanospheres in the wood was confirmed by Transmission electron microscopy (TEM). The PY-PW/wood hybrid was also resistant to leaching, attributed to the amphiphilicity of the nanospheres. The hybrid wood also showed superior flame retardation, with a UL-94 V-0 rating, and significantly reduced the peak heat release rate (pk-HRR) and total smoke release (TSR) values of the untreated wood by 44.7 % and 51.7 %, respectively. The enhanced flame retardation was attributed to synergistic effects and catalytic carbon reactions resulting from high-density nitrogen/phosphorus/oxygen cross-linking in the carbon layer in the condensed phase and the removal of combustible gases by free radicals. This hybrid wood material has potential application for the development of fire-safe wood.

Superior intrinsic flame-retardant phosphorylated chitosan aerogel as fully sustainable thermal insulation bio-based material

Owing to the arising environmental pollution and energy-related challenges, the utilization of renewable polysaccharides such as chitosan (CS) in the preparation of biodegradable aerogel heat-insulation materials represents a growing interest. In this study, a simple and low-cost route was proposed to synthesize a phosphorylated chitosan (PCS) with a high substitution degree of phosphate groups in a homogeneous H3PO4/acetic acid solution, and its chemical structure was confirmed using FT–IR spectroscopy, nuclear magnetic resonance, and X–ray photoelectron spectroscopy. An outstanding intrinsic flame-retardant PCS aerogel was directly fabricated via freeze-thawing and freeze-drying process. Remarkably, limited oxygen index values of the PCS aerogels increased to above 80%, and their UL–94 test results achieved V–0 rating. The peak heat release rate and total heat release rate values of PCS-4 aerogel significantly decreased by 91.2% and 73.0% compared with those of chitosan aerogel, respectively. The bio-based PCS aerogel with superior intrinsic flame retardancy, low thermal conductivity, and excellent hydrophobicity shows promise as new sustainable flame-retardant heat-insulation material.

Jadeite original stone inspired PBA core-shell architecture endowed fire-safe and mechanic-robust EP composites with low toxicity

Epoxy resin (EP) has been favored in extensive fields. Nevertheless, the notorious issue of high fire hazard has been a nonnegligible bottleneck for its extended application. Here, a Jadeite original stone inspired PBA core-shell architecture (Co–Fe–Co PBA) is constructed towards fire retardation and toxicity elimination of EP. This architecture holds high strengths in physically blocking and chemically catalyzing towards released volatiles, leading to markedly impaired fire hazard. By using 2.0 wt% Co–Fe–Co PBA, the peak heat release rate and total heat release values are decreased by 40.2% and 33.8% whilst the peak smoke production rate and total smoke production are reduced by 43.7% and 35.2%. Also, the inhibited emissions of toxic gases including CO, NO and HCN, are discovered. Of note, the promotion in impact strength can be acquired. In brief, this work may be encouraging for the construction of PBA based hierarchical architecture, as cornerstones for fire-safe polymer composites with low toxicity.

Design of Hierarchically Tailored Hybrids Based on Nickle Nanocrystal-Decorated Manganese Dioxides for Enhanced Fire Safety of Epoxy Resin.

A novel and hierarchical hybrid composite (MnO2@CHS@SA@Ni) was synthesized utilizing manganese dioxide (MnO2) nanosheets as the core structure, self-assembly chitosan (CHS), sodium alginate (SA) and nickel species (Ni) as surface layers, and it was further incorporated into an epoxy matrix for achieving fire hazard suppression via surface self-assembly technology. Herein, the resultant hybrid epoxy composite possessed an exceptional nano-barrier and synergistic charring effect to aid the formation of a compact layered structure that enhanced its fire-resistive effectiveness. As a result, the addition of only 2 wt% MnO2@CHS@SA@Ni hybrids led to a dramatic reduction in the peak heat release rate and total heat release values (by ca. 33% and 27.8%) of the epoxy matrix. Notably, the peak smoke production rate and total smoke production values of EP/MnO2@CHS@SA@Ni 2% were decreased by ca. 16.9 and 38.4% compared to the corresponding data of pristine EP. This was accompanied by the suppression of toxic CO, NO release and the diffusion of thermal pyrolysis gases during combustion through TG-IR results. Overall, a significant fire-testing outcome of the proposed hierarchical structure was proven to be effective for epoxy composites in terms of flammability, smoke and toxicity reductions, optimizing their prospects in other polymeric materials in the respective fields.

Construction of hydrophobic fire retardant coating on cotton fabric using a layer-by-layer spray coating method

Multifunctional cotton fabric was prepared through a two-step layer-by-layer spray coating method, where the first layer of the coating comprising chitosan and ammonium phytate provided fire retardancy, and the second one with PDMS-ZnO composite imparted hydrophobicity to the fabric. A molecular dynamics (MD) simulation study was carried out to calculate interfacial adhesion of different components of the coating, based on which the sequencing of the coating layers was determined and used to prepare coated samples. The coated fabric demonstrated a significant improvement in fire retardancy through an increase in LOI from 18 % in control to 30 %, a reduction in char length from 30 cm to 7 cm, and a decrease in peak and total heat release rate values by 75 % and 33 %, respectively. The hydrophobicity of coated fabric was tested via water drop test where coated sample maintained a contact angle of 148° for up to 120 s, while the control sample showed 0°.

Effects of phenylphosphonate and aliphatic phosphonate structures on the flame retardant performance of bismaleimide

The application of bismaleimide resins (BMI) has been severely restricted due to its inherent high fire hazard and brittleness. In this work, from the perspective of molecular structure, BMI monomers constructed with phenylphosphonate and aliphatic-phosphonate structure (MPPDP and MPMPD) were synthesized to endue BMI with intrinsic flame retardant properties and improve the toughness of BMI. With 5wt% MPPDP and 1wt% MPMPD adding, the peak value of heat release rate (PHRR) of BMI/MPPDP-5 and BMI/MPMPD-1 are of 52.4% and 54.0% reductions. The UL-94 of BMI/MPPDP-5 and BMI/MPMPD-1 are both of V-0 rating. Moreover, BMI/MPPDP-5 and BMI/MPMPD-1 have 90.2% and 65.8% increase on the impact strength. Therefore, the fire safety and impact toughness of BMI can be effectively improved by the designed MPPDP and MPMPD. The effect of phenylphosphonates and aliphatic phosphonates in MPPDP and MPMPD on BMI performance was explored and proposed.

Phytic Acid-Iron/Laponite Coatings for Enhanced Flame Retardancy, Antidripping and Mechanical Properties of Flexible Polyurethane Foam.

The use of flexible polyurethane foam (FPUF) is severely limited due to its flammability and dripping, which can easily cause major fire hazards. Therefore, choosing an appropriate flame retardant to solve this problem is an urgent need. A coating was prepared on the FPUF surface by dipping with phytic acid (PA), Fe2(SO4)3·xH2O, and laponite (LAP). The influence of PA-Fe/LAP coating on FPUF flame-retardant performance was explored by thermal stability, flame retardancy, combustion behavior, and smoke density analysis. FPUF/PA-Fe/LAP has a good performance in the small fire test, which can pass the UL-94 V-0 rating and the limiting oxygen index reaches 24.5%. Meanwhile, the peak heat release rate values and maximum smoke density of FPUF/PA-Fe/LAP are reduced by 38.7% and 38.5% compared with those of neat FPUF. After applying PA-Fe/LAP coating, the value of fire growth rate index decreases from 10.5 kW/(m2·s) to 5.1 kW/(m2·s), dramatically reducing the fire risk. Encouragingly, the effect of PA-Fe/LAP coating on cyclic compression and permanent deformation is small, which is close to that of neat FPUF. This work provides an effective strategy for making a flame-retardant FPUF with antidripping and keeping mechanical properties.

Superior flame retardancy, antidripping, and thermomechanical properties of polyamide nanocomposites with graphene‐based hybrid flame retardant

AbstractGraphene is considered one of the most prominent halogen‐free multifunctional flame retardants for polymers, and the resultant nanocomposites also display a good balance of properties. However, the biggest concern nowadays is thermal oxidative degradation, which mainly affects the flame retardant (FR) efficiency of graphene. To improve the flame retardancy and thermal oxidative degradation efficiency, graphene was functionalized with a combination of polycyclotriphosphazes and siloxanes via a sol–gel surface modification method, yielding a graphene‐based hybrid FR (PSGO) containing multiple elements (P, N, S, and Si). The PSGO‐containing PA6 composite exhibited significant improvements in the water resistance, thermal, mechanical, and FR properties, as compared with those of 3‐isocyanatopropyltriethoxysilane functionalized graphene oxide (ITS‐GO) and siloxane‐modified polycyclotriphosphazenes (m‐PZS) individually. The peak heat release rate and total heat release values of the PA6 composites with 10 wt% PSGO decreased by 45.7% and 36.9%, respectively, compared to those of pristine PA6. Moreover, it was confirmed that 10 wt% PSGO in the PA6 composite resulting in a V–0 rating in the UL‐94 tests, even after the water immersion test. These attractive properties are attributed to the resistance to thermal‐oxidative degradation of PSGO and the improved interfacial interactions with the polymer matrix. Therefore, this PSGO can be used as a multifunctional modifier to improve the water resistance, thermal, mechanical, and FR properties of polymers.

Microencapsulation of bisphenol A‐bis(diphenyl phosphate) by Pickering emulsions polymerization and its application in water‐borne polyacrylic acid coatings

AbstractFor improving the compatibility of oil‐based flame retardants and waterborne substrates, Bisphenol A‐bis(diphenyl phosphate) (BDP) is used as the dispersed phase, sodium alginate (SA) solution as the continuous phase, and hydrophilic silica as the emulsifier in the preparation of stable oil‐in‐water (O/W) Pickering emulsions. Then, the emulsions are added into CaCl2 solution in the atomized form to polymerize the aqueous phase to calcium alginate (CA) and to obtain BDP/SiO2/CA microcapsules. BDP/SiO2/CA microcapsules are used as a flame retardant to improve the fire safety of waterborne polyacrylic acid (PAA) coatings. To verify that BDP/SiO2/CA is successfully prepared, Fourier‐transform infrared spectra (FTIR) and scanning electron microscopy (SEM) are used after microencapsulation. The results show that the physical barrier formed by the SiO2 particle layer has successfully stabilized the BDP in the CA gel network. Subsequently, the flame retardance of PAA with BDP/SiO2/CA is tested using limiting oxygen index (LOI) test and cone calorimeter(CONE) test. Compared with pure PAA, when BDP/SiO2/CA (4:6) microcapsules are added at 20 wt %, the LOI of the PAA coating is increased from 18.6% to 28.4%, the peak heat release rate (PHRR) value of that is reduced by 52.66%. The microcapsules endow oily BDP hydrophilicity and good compatibility with waterborne PAA coatings.

Flame Retardant and Conductive Superhydrophobic Cotton Fabric with Excellent Electrothermal Property for Efficient Crude‐Oil/Water Mixture Separation and Fast Deicing

Fabrics have been widely used in the fields of oil–water separation and deicing in recent years. Considering that the fabric is deeply affected by accidental fires, a flame retardant and conductive superhydrophobic cotton fabric with excellent electrothermal property cotton fabric containing Phytic acid/3‐Aminopropyltriethoxysilane (PA/APTES), carbon nanotube (CNT), and polydimethylsiloxane (PDMS) is developed. The peak heat release rate (PHRR) and total heat release (THR) values of PA/APTES/CNTs/PDMS‐coated fabric significantly declines by 63% and 76%, respectively, when compared to pristine cotton fabrics. Moreover, the heating uniformity on the PA/APTES/CNTs/PDMS‐coated fabric surface is validated by infrared thermography technology. Surprisingly, the CNTs layer also endow the coated fabric with excellent electrothermal capability, with its surface temperature rapidly rising from 22.8 to 500.7 °C within 10 s at a voltage of 25 V. Employing the generated Joule heat, the PA/APTES/CNTs/PDMS‐coated fabric can successfully separate crude oil and water, and the separation efficiency is much higher than that without voltage, about 9.5 times higher. In addition, the coated fabric also has excellent deicing performance. The ice cube with a volume of 12 cm3 is completely melted within 1380 s under 15 V voltage.

An integrated intumescent flame retardant of bismaleimide from novel maleimide-functionalized triazine-rich polyphosphazene microspheres

In view of the problems of poor toughness and high fire risk of bismaleimide (BMI), a novel maleimide-functionalized triazine-rich polyphosphazene microsphere (PPM) was designed and prepared in this work by combining the flame retardant advantages of polyphosphazene and melamine. The functionalization of organic maleimide in PPM can improve the interfacial compatibility between PPM and BMI. With addition of 2.0 wt% PPM, the peak value of heat release rate (PHRR) and total smoke production (TSP) of BMI/PPM-2.0 decrease by 52.8 % and 30.8 %, respectively, while its impact strength increases by 97.5 %, which means that the fire safety and toughness of BMI/PPM are much better. The study on flame retardant mechanism of PPM reveals that PPM has obvious condensed-phase intumescent flame-retardant effect, which may be due to the similar composition of PPM and intumescent flame retardant. In addition, PPM has the phosphorus-oxygen radical flame-retardant effect in gas phase and also has the toughening effect of inorganic rigid particles on BMI performance.

Permanent P/N-rich polymeric coating capable of extinguishing flame on cotton fabrics

Although polyphosphazenes having attracted attention for use as flame-retardant coatings for textiles, nonetheless their add-on level is still far from ideal with regard to high-efficiency flame-retardant properties, wearing comfort and durability. Herein, for the first time, a cross-linkable phosphorus and nitrogen-rich polyphosphazene, poly(methoxy/allylphenoxy)phosphazene (PMAP), with mainly methoxy groups and an appropriate amount of unsaturated chemical bonds containing allylphenoxy side groups (ca. 8 %) was synthesized. Subsequently, the noncombustible, transparent, elastic crosslinked PMAP coating was coated on cotton fabrics through dipping and photoinduced cross-linking processes. The PMAP-coated cotton showed high-efficiency flame-retardant properties along with remarkably high durability. The intrinsic properties of cotton fabric, such as whiteness, gas permeability and bending rigidity, were highly reserved after being coated with PMAP. Interestingly, the flame-retardant properties of the 4.9 wt%-coated cotton increased, and the coated cotton obtained a self-extinguishing property and maintained >95 % of its initial mass after 60 rigorous laundry cycles. Moreover, the PMAP-coated cotton exhibited enhanced carbonization ability at lower temperatures, which was the key to the flame-retardant properties of cotton fabric. The PMAP-coated cotton also showed a lower peak heat release rate and total heat release values than the control cotton during combustion. Therefore, the comprehensive highly favorable properties of the PMAP coating make it a cutting-edge material for flame-retardant cotton fabrics and greatly expand its potential in practical applications.

Cardanol-derived anhydride cross-linked epoxy thermosets with intrinsic anti-flammability, toughness and shape memory effect

With the increasing awareness of environmental protection, the development of high-performance bio-based epoxy resins has attracted more and more attention to reduce the dependence on the petroleum-based 4,4′-diaminodiphenylmethane (DDM). In this work, we synthesized two kinds of cardanol-based curing agents (Car-DCP-MAH and Car-DPC-MAH) as alternatives for petroleum-based DDM. The chemical structures of Car-DCP-MAH and Car-DPC-MAH were confirmed by 1H and 31P NMR. Compared with the traditional DGEBA/DDM thermoset, the cured DGEBA/Car-DCP-MAH and DGEBA/Car-DPC-MAH thermosets both displayed good intrinsic fire resistance in terms of higher LOI values (29% and 28%, respectively, versus 24.5%) and V-0 rating in the UL-94 test. Furthermore, the results of the cone calorimeter test showed a significant reduction in the peak heat release rate (PHRR) values of the cured DGEBA/Car-DCP-MAH and DGEBA/Car-DPC-MAH which were 42.3% and 47.7%. The flame retardancy of these two systems was mainly due to the great carbonization ability and the formation of the intact and compact char layer. Owning to the flexible long alkyl chain in the crosslinking network, the toughness of the cured DGEBA/Car-DCP-MAH and DGEBA/Car-DPC-MAH products was greatly improved with the higher elongation at break and impact strength. Additionally, the cured DGEBA/Car-DCP-MAH and DGEBA/Car-DPC-MAH thermosets both showed preferable shape memory properties with a high shape recovery efficiency of 98.6% and 96.3%. This study provides a novel strategy to achieve bio-based epoxy thermosets with intrinsic anti-flammability, toughness and shape memory effect.

Preparation of Ni-Fe layered double hydroxides and its application in thermoplastic polyurethane with flame retardancy and smoke suppression

Aluminum hypophosphite (AHP), as an effective phosphorus-based flame retardant used in thermoplastic polyurethane (TPU), released a large amount of smoke and toxic gasses during combustion. In this work, a flame retardant filler, Ni-Fe layered double hydroxides (NiFe-LDHs), was synthesized and applied in TPU together with AHP. The limiting oxygen index (LOI) of the TPU/6AHP/1NiFe-LDH composite reached 30.7% with a V-0 rating in the UL-94 test. Compared with neat TPU, the peak heat release rate (pHRR) and total heat release (THR) values of TPU/6AHP/1NiFe-LDH sample were reduced by 67.9% and 40.8%, respectively. Moreover, both the smoke production and CO/CO2 yield were also decreased sharply. It was proposed that NiFe-LDH provided the effect of catalyzing char formation, and the obtained dense char layer was able to block both heat and smoke release. In addition, the addition of NiFe-LDH had little effect on the mechanical properties of TPU, and the tensile strength and elongation at break only decreased by 6.0% and 6.9%, respectively. This work provides a new strategy for fillers and flame retardants to improve the flame retardant properties and smoke suppression of TPU.

Preparation of BMI monomers containing phosphate and phosphonate structure to enhance the flame retardant and toughness of BMI

Aiming at enhancing the toughness and fire safety of bismaleimide (BMI), BMI monomers containing phosphate and phosphonate structure (BDTP and BDTDP) were designed and prepared. With incorporation of 5 wt% BDTP and BDTDP, the peak value of heat release rate (PHRR) of BMI/BDTP-5 and BMI/BDTDP-5 decrease by 59.4% and 52.4%, respectively. The total smoke production (TSP) of BMI/BDTP-5 and BMI/BDTDP-5 are of 8.3% and 13.1% reduction, respectively. Meanwhile, BMI/BDTP-5 and BMI/BDTDP-5 possess UL-94V-0 rating, which indicates that BMI is endowed with better flame retardant performance by modification of designed BMI monomers. Besides, the impact strength of BMI/BDTP-5 and BMI/BDTDP-5 increase by 146.3% and 90.2%, respectively. The comprehensive performance of BMI/BDTP-5 is better than that of BMI/BDTDP-5. And the effect of phenyl phosphate structure in BDTP and phenyl phosphonate structure in BDTDP on BMI performance is explored.

Cactus-like structure of BP@MoS2 hybrids: An effective mechanical reinforcement and flame retardant additive for waterborne polyurethane

Design novel flame retardant and mechanical enhancing agents of waterborne polyurethane (WPU) is a crucial issue for expanding its application. Herein, BP@MoS2 hybrids was designed and prepared to enhance the fire safety and mechanical properties of WPU and BP@MoS2 possessed a novel cactus-like structure. BP@MoS2 was prepared in a two-step method including preparation of black phosphorus (BP) sheets by chemical vapor transfer method and preparation of BP@MoS2 by in situ growth of molybdenum disulfide (MoS2). with adding 2.0wt% BP@MoS2, the tensile strength and fracture strength of WPU/BP@MoS2-2.0 increase by 57.7% and 36.5%, respectively. The peak value of heat release rate (PHRR) and total smoke production (TSP) of WPU/BP@MoS2-2.0 also reduce by 50.3% and 52.0%, which indicates that fire safety and mechanical performance of WPU/BP@MoS2-2.0 is effectively enhanced. Meanwhile, BP@MoS2 has both condensed phase and gas phase flame retardant effect on WPU. In condensed phase, the residue char of WPU/BP@MoS2 is with excellent physical barrier effect. In gas phase, BP@MoS2 can inhibit the generation of flammable volatiles such as aromatic and aliphatic compounds during burning of WPU/BP@MoS2, thereby inhibiting the heat release and smoke release behavior of WPU/BP@MoS2.

A Highly Effective, UV-Curable, Intumescent, Flame-Retardant Coating Containing Phosphorus, Nitrogen, and Sulfur, Based on Thiol-Ene Click Reaction.

In this paper, a flame-retardant, UV-cured coating was prepared on the fiber composites’ (FC) surface via a thiol-ene click reaction using pentaerythritol tetra(3-mercaptopropionate) (PETMP), triallyl cyanurate (TAC), and 2-hydroxyethyl methacrylate phosphate (PM-2). The synergistic effectiveness of phosphorus (P), nitrogen (N), and sulfur (S) was studied in detail by changing the proportion of these reactants. Sample S4(N3P2)6, with a molar ratio of N and P elements of 3:2, and the thiol and vinyl groups of 4:6 had the highest LOI value (28.6%) and was self-extinguishing in the horizontal combustion test. It had the lowest peak heat release rate (PHRR) value (279.25 kW/m2) and total smoke production (2.18 m2). Moreover, the thermogravimetric analysis (TG) showed that the decomposition process of the coated composites was delayed. The conversion rate of the double bond and the thiol of S4(N3P2)6 was 100% and 92.0%, respectively, which showed that the cross-linked network structure was successfully formed. The tensile strength and the flexural strength of coated composites improved, and the transparency of the coating can reach 90%. These characteristics showed that the UV-cured coatings could be used in industrial production to effectively prevent fires.

Excellent antioxidizing, thermally insulating and flame resistance silica‐polybenzoxazine aerogels for aircraft ablative materials

AbstractHigh‐performance thermal protective composites with lightweight, micro‐ ablation and high‐efficient thermal insulation are urgently required for thermal protection systems in advanced hypersonic speed vehicles. However, the practical applications of thermal protective composites have long been hampered by the main issues such as low mass residual rate and poor long‐term antioxidation of the matrix in high‐temperature aerobic environments. Here, we report a novel silica‐polybenz oxazine (SiO2‐PBO) aerogels with interpenetrated networks, possessing the ability to antioxidation, thermal insulation, and flame‐retardant properties. The resulting SiO2‐PBO aerogels exhibit low density (0.25 g/cm3), low thermal conductivity (0.035 W/(m·K)), and superior peak heat release rate value (15.3 W/g). Moreover, the mass residual rate is up to 70.46 wt% in the N2 atmosphere and remains 57.83 wt% despite existing in the air atmosphere and experiencing the highest temperature of 800°C. Briefly, SiO2‐PBO aerogels as‐prepared could be a potential matrix for a new gene ration of high‐performance thermal protective composites in the future.

Constructing a novel synergistic flame retardant by hybridization of zeolitic imidazolate framework‐67 and graphene oxide for thermoplastic polyurethane

AbstractTo enhance the flame retardancy and smoke suppression of thermoplastic polyurethane (TPU), a novel flame retardant ZIF‐67@GO was fabricated by hybridization of zeolitic imidazolate framework‐67 (ZIF‐67) and graphene oxide (GO). The flame retardancy of TPU sample was significantly enhanced by the presence of 6.5 wt% ammonium polyphosphate (APP) and 0.5 wt% ZIF‐67@GO: the limit oxygen index (LOI) reached 27.4% and UL‐94 grade passed V‐0, the peak heat release rate (pHRR) and peak smoke production rate (pSPR) values was dropped by 81.2% and 48.7%, respectively, comparing with that of the control sample. The burning time of the flame‐retardant TPU sample was prolonged to more than 600 s from 200 s of the control TPU sample during the cone test. Additionally, the tensile strength and elongation ratio of the flame‐retardant TPU reached 18.3 MPa and 1026.3%, respectively, which meet the requirement in most industrial applications. This work provides useful information to produce flame retardant synergists for polymeric composites.

Effect of phosphorus-containing modified UiO-66-NH2 on flame retardant and mechanical properties of unsaturated polyester

A novel phosphorus-containing flame retardant PZN@UiO-66-NH2 was synthesized by covalent bonding between HCCP and UiO-66-NH2, and applied in unsaturated polyester (UPR). The Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron energy spectra (XPS), scanning electron microscopy (SEM) was used to confirm the chemical structure of PZN@UiO-66-NH2. The appearance of new P-N-C bond indicated that HCCP was successfully reacted with UiO-66-NH2. The thermal stability and the flame-retardant properties of the UPR composites were characterized by thermogravimetric analysis (TGA), limiting oxygen index (LOI) and cone calorimeter test. The limiting oxygen index (LOI) of UPR composite with 4 wt% PZN@UiO-66-NH2 can reach 23.9%. Compared with pure UPR, the peak heat release rate (PHRR) value, total heat release (THR) value and average effective heat of combustion (av-EHC) value of UPR composite with 4 wt% PZN@UiO-66-NH2 dropped by 36.53%, 28.70%, 23.50%, respectively. The addition of PZN@UiO-66-NH2 slightly improved the impact performance of UPR composite. PZN@UiO-66-NH2 can solve UiO-66-NH2's agglomeration dilemma in UPR to some extent.