Polyol Research Articles

Utilization of Neem Seed Oil as Surfactant in the Production of Flexible and Rigid Polyurethane Foam

Extraction and processing of polyether polyols derived from petrochemicals, commonly used as surfactants during polyurethane foam (PUF) production, contribute to carbon emissions and raises the issue of long-term sustainability given that petrochemicals are non-renewable resources. Here, 5 mg and 4 mg of neem seed oil are employed to form flexible and rigid PUF, classified purposefully based on their divergent usage. To find an environmentally friendly replacement, flexible PUF whose mass, volume, density, compression, tensile strength, cream time, foam rise and rising time are 0.0047 kg m3, 16.52 kg/m3, 8.10%, 39.28 kN/m2, 60s, 10s and 60s is formed by mixing 1.25 kg polyol, 5mg silicon oil and 10g calcium carbonate (CaCO3). Likewise, by mixing 1.2 kg polyol, 4mg silicon oil and 8g CaCO3, a rigid PUF with 0.005kg, m3, 16.2 kg/m3, 8.15%, 40.72 kN/m2, 50s, 15 cm and 58s key, physical and mechanical property as respectively listed under the flexible PUF formulation is produced. Both foams were produced using equal amounts of toluene diisocyanate, water, stannous octoate and methylene chloride, resulting in PUF that can be used in insulation, cushioning and construction support applications based on their characteristic height, density, tensile strength and compressive strength. As the surfactant, neem seed oil's potential in the synthesis of PUF cannot be overemphasized. The study of the kinetics of PUF production is limited and should trigger the adoption of biobased surfactants for industrial applications in the future.

Imine-containing Self-healing Waterborne Polyurethane Elastomeric Coating Derived from Bio-based Polyester Polyol

Imine-containing Self-healing Waterborne Polyurethane Elastomeric Coating Derived from Bio-based Polyester Polyol

Recycled polypropylene/crystalline cellulose composites obtained using polypropylene functionalized with maleinized hyperbranched polyol polyester as compatibilizing and plasticizing agent

AbstractRecycled polypropylene (rPP)/crystalline cellulose (rPP/CC) composites are promising alternatives for reducing the detrimental environmental consequences of virgin PP. However, the incompatibility of the rPP/CC composites hinders their widespread application. In this study, PP functionalized with maleinized hyperbranched polyol polyester (PP‐g‐MHBP) was used as a compatibilizing and plasticizing agent for the rPP/CC composites. Furthermore, the effect of PP‐g‐MHBP content on the rheological, thermal, morphological, and mechanical properties of the rPP/CC composites was evaluated. The composites were prepared at a mixing speed of 50 rpm for 7 min and the PP‐g‐MHBP content was varied between 0 and 20 wt%. The torque stabilization time was less than 1 min. The activation energy of flow () decreased with increasing PP‐g‐MHBP content, with its values ranging from 0.78 × 102 to 1.42 × 102 kcal.mol−1. The flow index () followed the opposite trend with values ranging from 0.55 ± 0.0030 to 0.85 ± 0.0010. PP‐g‐MHBP enhanced the processability, thermal stability and conductivity. The crystallinity, interactions between rPP and CC, and tensile modulus of the rPP/CC composites were also enhanced. Furthermore, it reduced the agglomeration of CC particles.Highlights The torque stabilization was lowest for all composites. The composites displayed low activation energy of flow. Recycled polypropylene and crystalline cellulose exhibited good interaction. The plasticizing effect was higher than that of compatibilization. The thermal stability and mechanical properties of the composites improved.

Polyurethanes Synthesized with Blends of Polyester and Polycarbonate Polyols—New Evidence Supporting the Dynamic Non-Covalent Exchange Mechanism of Intrinsic Self-Healing at 20 °C

Polyurethanes (PUs) synthesized with blends of polycarbonate and polyester polyols (CD+PEs) showed intrinsic self-healing at 20 °C. The decrease in the polycarbonate soft segments content increased the self-healing time and reduced the kinetics of self-healing of the PUs. The percentage of C-O species decreased and the ones of C-N and C=O species increased by increasing the polyester soft segments in the PUs, due to higher micro-phase separation. All PUs synthetized with CD+PE blends exhibited free carbonate species and interactions between the polycarbonate and polyester soft segments to a somewhat similar extent in all PUs. By increasing the polyester soft segments content, the storage moduli of the PUs decreased and the tan delta values increased, which resulted in favored polycarbonate soft segments interactions, and this was related to slower kinetics of self-healing at 20 °C. Although the PU made with a mixture of 20 wt.% CD and 80 wt.% PE showed cold crystallization and important crystallinity of the soft segments, as well as high storage moduli, the intercalation of a small amount of polycarbonate soft segments disturbed the interactions between the polyester soft segments, so it exhibited self-healing at 20 °C. The self-healing of the PUs was attributed to the physical interactions between polycarbonate soft segments themselves and with polyester soft segments, and, to a minor extent, to the mobility of the polymeric chains. Finally, the PUs made with 40 wt.% or more polyester polyol showed acceptable mechanical properties.

Functional Thermoplastic Polyurethane Elastomers with α, ω-Hydroxyl End-Functionalized Polyacrylates.

Thermoplastic polyurethane (TPU) is an essential class of materials for demanding applications, from soft robotics and electronics to medical devices and batteries. However, traditional TPU development is primarily relied on specific soft segments, such as polyether, polyester, and polycarbonate polyols. Here, a novel method is introduced for developing TPU elastomers with enhanced performance and superior functionalities compared to conventional TPUs, achieved through the use of α,ω-hydroxyl end-functionalized polyacrylates. This approach involves a defect-free synthesis of α,ω-hydroxyl end-functionalized polyacrylates through visible-light-driven photoiniferter polymerization. By strategically blending these functionalized polyacrylates with conventional polyols, TPUs that exhibit exceptional toughness and notable self-healing capabilities, traits rarely found in existing TPUs are engineered. Furthermore, incorporating photo-crosslinkable acrylic monomers has enabled the creation of the first TPU with superior elastomeric properties and photopatterning capabilities. This approach paves the way for a new direction in polyurethane engineering, introducing a novel class of soft segments and unlocking the potential for a wide range of advanced applications.

Discovery of a polyurethane-degrading enzyme from the gut bacterium of plastic-eating mealworms

Although numerous polyurethane (PU)-degrading enzymes were identified from a diverse array of microorganisms in soil or compost, it is intriguing to investigate whether novel PU-degrading enzymes can be discovered in other biological environments. This study reports the discovery of an enzyme (MTL) for PU plastic degradation from the bacterial strain Mixta tenebrionis BIT-26, isolated from the gut of plastic-eating mealworms. MTL shows significant degradation activity towards three commercial PU substrates, including Impranil®DLN-SD, thermoplastic films (PEGA-HDI), and thermoset foams (PEGA-TDI), by cleaving the ester bonds in the polyester polyol moieties. The structure, molecular docking, and site-directed mutagenesis analyses elucidate the substrate binding model. A combination of structure-based comparison and mutational studies reveals the underlying architecture of the enzyme's specificity. These findings provide a fresh perspective into understanding plastic metabolism in the gut of plastic-eating insects and a prospective path for developing a biodegradation technique for plastic waste disposal.

Plant Design for the Production of Propylene Oxide by Isopropylbenzene 2-phenylpropane, or (1-Methylethyl) Benzene (Cumene)

Cumene is a colorless, volatile liquid with a gasoline-like odor. It’s also known as isopropylbenzene, 2-phenylpropane, or (1-methylethyl) benzene. It’s a natural component of coal tar and crude oil, and it can also be employed in gasoline as a blending component. Cumene hydroperoxide is produced by oxidizing cumene with benzene and propylene in the presence of air. As a result, the cumene hydroperoxide is changed to cumyl alcohol, which is then transformed to propylene without the use of oxygen. Propylene oxide is an organic compound produced through various methods such as the cumene process and the hydroperoxide process. The cumene method is preferred due to its low by-product production and high market value of co-products. The reactive distillation process is a feasible method for producing propylene oxide with high purity and reduced costs. Future work includes optimizing processes, developing new catalysts, and improving efficiency. Propylene oxide has practical applications in the production of polyurethane foams, coatings, adhesives, polyether polyols, and propylene glycols.

Synthesis of α,ω-Primary Hydroxyl-Terminated Polyether Polyols Using Prussian Blue Analogs as Catalysts

Synthesis of α,ω-Primary Hydroxyl-Terminated Polyether Polyols Using Prussian Blue Analogs as Catalysts

Study on Grouting Performance Optimization of Polymer Composite Materials Applied to Water Plugging and Reinforcement in Mines.

With the increasing drilling depth of mines, the cross-complexity of fissures in the rock body, and the frequent occurrence of sudden water surges, polymer slurry, with its advantages of good permeability and strong water plugging, is increasingly used in mine grouting projects. Additional research is needed in order to further improve the grouting performance of polymer slurry, ensure the safety of mining operations, and reduce the grouting cost. In this paper, a polymer composite grouting material was prepared with diphenyl methyl diisocyanate, polyether polyol, and fly ash, as the main raw materials, with coupling agent and catalyst as auxiliary reagents. The performance of the composite grouting material in terms of mechanical properties, thermal stability, hydrophobicity, and bonding was explored. This study's findings indicated that incorporating fly ash led to notable enhancements in the thermal stability and water resistance of the polymer slurry. Furthermore, the introduction of fly ash notably raised the starting degradation temperature of the polymer, boosted the water contact angle of the composite material, and reduced the density and reaction temperature of the composite material. In addition, the catalyst and coupling agent as auxiliary reagents affected the polymers in terms of mechanical properties; in this paper, dibutyltin dilaurate was used as the catalyst, and organosilanes were used as the coupling agent. The catalyst successfully sped up the polymer's gel time, however, an excessive quantity of catalyst compromised the polymer's mechanical characteristics. The addition of organosilanes has a positive effect on the dynamic mechanical properties of the composites, fracture toughness, compression, bending, and bond strength. The research can offer a theoretical direction for creating polymer mixtures in mine grouting projects.

A Novel PAMAM G3 Dendrimer-Based Foam with Polyether Polyol and Castor Oil Components as Drug Delivery System into Cancer and Normal Cells.

One of the intensively developed tools for cancer therapy is drug-releasing matrices. Polyamidoamine dendrimers (PAMAM) are commonly used as nanoparticles to increase the solubility, stability and retention of drugs in the human body. Most often, drugs are encapsulated in PAMAM cavities or covalently attached to their surface. However, there are no data on the use of PAMAM dendrimers as a component of porous matrices based on polyurethane foams for the controlled release of drugs and biologically active substances. Therefore, in this work, porous materials based on polyurethane foam with incorporated third-generation poly(amidoamine) dendrimers (PAMAM G3) were synthesized and characterized. Density, water uptake and morphology of foams were examined with SEM and XPS. The PAMAM was liquefied with polyether polyol (G441) and reacted with polymeric 4,4'-diphenylmethane diisocyanate (pMDI) in the presence of silicone, water and a catalyst to obtain foam (PF1). In selected compositions, the castor oil was added (PF2). Analogs without PAMAM G3 were also synthesized (F1 and F2, respectively). An SEM analysis of foams showed that they are composed of thin ribs/walls forming an interconnected network containing hollow bubbles/pores and showing some irregularities in the structure. Foam from a G3:G441:CO (PF2) composition is characterized by a more regular structure than the foam from the composition without castor oil. The encapsulation efficiency of drugs determined by the XPS method shows that it varies depending on the matrix and the drug and ranges from several to a dozen mass percent. In vitro biological studies with direct contact and extract assays indicated that the F2 matrix was highly biocompatible. Significant toxicity of dendrimeric matrices PF1 and PF2 containing 50% of PAMAM G3 was higher against human squamous carcinoma cells than human immortalized keratinocytes. The ability of the matrices to immobilize drugs was demonstrated in the example of perspective (Nimesulide, 8-Methoxypsolarene) or approved anticancer drugs (Doxorubicin-DOX, 5-Aminolevulinic acid). Release into the culture medium and penetration of DOX into the tested SCC-15 and HaCaT cells were also proved. The results show that further modification of the obtained matrices may lead to their use as drug delivery systems, e.g., for anticancer therapy.

Sustainable castor oil-based microcellular polyurethane foam with desirable flame retardancy, vibration damping performance and recyclability

Microcellular polyurethane foam (MPUF) is extensively utilized as a vibration dampening material. However, its long chain and porous composition render it highly susceptible to combustion. Herein, we grafted the flame retardant 9,10-dihydro-9-oxa-10-phospha-phenanthrene-10-oxide (DOPO) onto the castor oil by a simple method to obtain a bio-based flame-retardant polyester polyol (COBH). Then, a bio-based flame-retardant MPUF was synthesized by one-pot synthesis of COBH, polyether polyol, and isocyanate. The target MPUF exhibits excellent flame retardancy, with the limiting oxygen index (LOI) sharply increasing from 19.3 % to 27.6 % and the peak of heat release rate (PHRR) decreasing significantly by 60.1 % as compared to MPUF prepared using unmodified castor oil. In addition, the MPUF shows good vibration dampening performance with a maximum loss factor of 5.2 and a maximum Sc-factor of 250. Moreover, the MPUF can be processed into MPU film by compression molding. The MPU film has adjustable mechanical properties and reusability. This study provides a feasible method for the preparation of flame-retardant, recyclable, bio-based MPUF with good vibration damping properties, thus expanding the practical applications of MPUF in the automotive, aerospace, and packaging and transportation industries.

Fabricating coconut palm-based rigid polyurethane foam with enhanced compressive strength using biomass waste

The continued depletion of fossil fuels compels the exploitation of biomass as alternative. Herein, coconut palm, as a common tropical biomass, was first used to prepare polyether polyols via liquefaction method. The obtained polyether polyols were employed to fabricate rigid polyurethane foam (RPUF), which is widely applied in the industry. Moreover, the prepared RPUF was further modified by biomass waste including coconut shell (CS), coconut palm (CP), and seaweed (SE), with the contents of 5–15 wt%. The results showed that the addition of fillers can decrease the apparent densities and increase the compressive strength of the foams. The foam modified with 15 wt% CS exhibits the highest compressive strength with a value of 355 kPa and normalized value of 290 kPa among the prepared RPUF. In addition, an appropriate content of fillers can slightly increase the thermal stability of RPUF. The combustion performance test indicates that the introduction of fillers slightly increases the oxygen index value of coconut-based polyurethane, which produces less smoke than unmodified foam. Compared with the HRR of unmodified foam, the HRR of RPUF modified with CP are higher while those modified with SE are smaller. The foams modified with SE exhibit the optimal flame-retardant property. This work provides a novel and sustainable route to prepare and modify bio-based RPUF, which can furnish a clue to prepare bio-based RPUF with desirable performance.

Degradation of Bioderived Polyurethane Composites by Spectroscopy in ISO20200 Composting Conditions.

Polyurethane foam compositions derived from bioderived polyester polyols with various additives were evaluated for disintegration under composting conditions using the ISO 20200 standard and were characterized by thermogravimetric analysis, microscopy, infrared spectroscopy, and imaging to provide additional insight. Compared to polyether polyol-based polyurethanes, the bioderived polyurethanes were found to display increased disintegration with an average mass loss of 25.4 ± 3.6 weight percent when subjected to composting conditions for 45 days, suggesting that these materials are less likely to persist in the environment when compared to other types of commodity plastics. Additives such as carbon black and lignin added within the foam composition did not accelerate the disintegration.

Impact of proximity of hard and soft segment on IR frequency of carbamate links correlating the mechanical properties of surface-functionalized fly ash–reinforced polyurethane composites

Abstract Polyurethane composites synthesized by interaction of fly ash filler with polyether polyol, cross-linking agent, and curing agent in a certain ratio. The study’s findings show that the mechanical properties of polyurethane composite are lowered by the hydroxyl moieties of surface-functionalized fly ash that are chemically or physically linked. The study also reveals that prior subjecting the samples of surface-functionalized fly ash–reinforced polyurethane composite material for destructive analysis by UTM for evaluating mechanical properties. The in-depth study of the IR spectroscopy data of the composites is done focusing onto the stretching frequency of carbonyl group of carbamate links the trend in mechanical behavior of the samples, the number of fly ash–carbamate links, and proximity of HS–SS (hard segment–soft segment) of fly ash–reinforced polyurethane composites can be foretold. By a detailed analysis of the patterns of carbonyl stretching frequencies of carbamate links, one can gain insight into the microphasic level of the separation and proximity of hard and soft segments in composites, which govern their mechanical properties. The relationships between carbamate carbonyl stretching frequencies and mechanical characteristics of composites have been found to be inversely correlated. In order to offset the excess hydroxyl group contribution due to OH-loaded fly ash, as indicated by the isocyanate (NCO) peak intensity (2,240–2,280 cm−1) in the composite’s infrared spectra, the studies were conducted at a higher index ratio (1.64).

Controlling polydopamine deposition morphology on the surface of poly(vinylidene fluoride) microfiltration membranes for improved oil-water filtration performance

Herein, we studied the effect of adding into water-dopamine mixture a small amount of the fourth generation of bis-MPA based Boltorn™ hyperbranched polyol polyester (H40) or inorganic nanolayered compound MXene on the development of polydopamine (PDA) coating morphology on the surface of polyvinylidene fluoride (PVDF) microfiltration membranes targeting to further enhance their oil fouling resistance and oil-in-water (O/W) filtration performance. Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM) with Energy Dispersive X-Ray (EDX), Atomic Force Microscopy (AFM), and Water Contact Angle (WCA) techniques were used for characterization of the modified surfaces. The pure water and (O/W) tight emulsion filtration testing was conducted using a custom-made dead-end filtration setup. It was shown that in the case of dopamine only treatment, the formed on the surface PDA coating largely showed a planar, homogeneous growth which tended to envelope not only the membrane surface irregularities but also the pores thus greatly reducing their size and compromising the permeate flux despite significantly improved surface hydrophilicity. Adding either MXene or H40 into water-dopamine mixture rendered a beneficial effect on the membrane oil fouling resistance and permeation/filtration characteristics. The most spectacular, a hitherto not reported effect was observed after adding into water-dopamine mixture the H40 polymer. In contrast to the planar PDA deposition, the coating morphology in this case consisted of fused together tiny PDA clumps. The ‘clumpy’ PDA coating made less pore blockage and the membranes demonstrated many times greater flux either for pure water or emulsion permeate than after using dopamine only or dopamine with MXene treatments while continued to exhibit oleophobic behavior and high resistance to oil fouling over multiple filtration cycles. The potential nucleating role of this hyperbranched polymer in the development of the PDA clumps is discussed.

Structural elucidation of complex polyesters polyols from bio-lubricant using off-line liquid chromatography x supercritical fluid chromatography coupled with Orbitrap mass spectrometry

Synthetic complex esters and polyol esters are incorporated as partially bio-based and biodegradable alternatives to petroleum base oils in lubricant formulations, to provide specific properties or performance and to help reducing their carbon footprint in certain cases. A sample can contain over 400 molecules of high chemical similarity including numerous isomers. To resolve such complexity, a separation technique with large peak capacity coupled to high-resolution mass spectrometry (HRMS) is essential. In this study, comprehensive off-line LCxSFC hyphenated with an Orbitrap analyzer was used for the structural elucidation of a synthetic bio-lubricant composed of a polyol reacted with fatty acids of varying length or with repetitive units of polyesters of ricinoleic acid. Retention in the LC first dimension was mostly due to the degree of oligomerization of ricinoleic acid within the polyester and to the chain length of the fatty acid. The SFC second dimension highlighted the esterification degree of the polyalcohol and the number and positions of fatty acids double bonds. The combination of both dimensions permitted the separation of isomers. The coupling of SFC with Orbitrap analyzer allowed an accurate assignment of molecular formulas. Finally, the fragmentation in the ionization source confirmed the attributed structures. By introducing a clear distribution of the chemical structures in the retention space, LCxSFC-HRMS provided a powerful analytical method for the comprehensive molecular characterization of the complex polyester polyols sample.

Preparation and characterization of wood coatings fabricated from 3D interpenetrating networks of hydroxylated rosin-CO2-polyurethane and benzoxazine

Rosin polyether polyol was synthesized through the hydroxylation of rosin and epoxy. This polyol was then used to modify CO2-polyols for the synthesis of rosin-CO2-polyurethane (RPU) as a wood coating. Simultaneously, a rosin-based benzoxazine (SBZ) was prepared using sesamol, paraformaldehyde, and dehydroabietylamine, and 3D interpenetrating network system, RPU/SBZ, was formed. The two coatings were further examined. Research has demonstrated that both RPU and the RPU/SBZ 3D interpenetrating network system exhibit excellent mechanical properties, with the latter outperforming the former. The hydrophobic angle of the RPU/SBZ coating measures 119° and remains unchanged over a short period, while the initial water contact angle of the RPU coating is 85° and decreases by 2° shortly after application. The RPU/SBZ composite system coating demonstrates superior chemical resistance, gloss, and adhesion to wood compared to the RPU coating. Additionally, RPU- and RPU/SBZ-based composite system coatings exhibit exceptional flame retardancy as wood coatings. These findings hold significant implications for the development of high-value products in the coating industry.

Ceresin wax enhances hydrophobicity and density of bio-based polyurethane of controlled-release fertilizers: Streamlined production, improved nutrient release performance, and reduced cost

Bio-based coated controlled-release fertilizers (BCRFs) can significantly improve nutrient utilization and reduce pollution. However, challenges such as spray gun clogging, adhesion and tearing between fertilizers during the actual production of BCRFs pose a severe challenge to production chain development. In addition, the poor hydrophobicity and cross-linking properties of bio-based coatings severely affect the controlled release properties of BCRFs. Although some measures have been taken to ameliorate the above problems, the cumbersome and costly modification process is challenging to be applied on a large scale. Therefore, the primary goal of this work is to search for a more straightforward and efficient method of production and modification to address the aforementioned unresolved challenges in the field of CRFs. In this study, bio-based polyester polyol (BPP) was used as the base for polyurethane reaction, and low-viscosity castor oil (CO) was used as the modifier to reduce the viscosity of BPP. This led to the preparation of Inter-Modified Coated Controlled-Release Fertilizers (ICRFs) to prevent spray gun clogging. Building upon this, hydrophobic and dense wax-based coated fertilizer (WBCF) was prepared by modifying ICRF with Ceresin wax to alleviate the challenges associated with adhesion and tearing between fertilizer particles during the coating process. The WBCF exhibited remarkable controlled-release characteristics, with a nitrogen (N) release longevity of nearly 180 days, requiring only 3 % of the coating materials. This work provides a simple and efficient strategy for overcoming the key constraints in the development and production of CRFs and provides insights into developing green, low-cost fertilizers with excellent controlled-release properties.

Soundproofing properties of open- cell microcellular polyurethane foam containing styrene-grafted polyester polyol

Both soundproofing and mechanical strength present significant challenges in the context of sound-insulating materials. Herein, to take advantage of higher intermolecular interactions of ester groups, a soundproofing open-cell Microcellular Polyurethane Foam (MPUF) was developed using polymer-grafted polyester polyol (POP) and saturated polyester polyol. The POP was synthesized by grafting polystyrene on unsaturated polyester polyol (UNPES) in a saturated polyester polyol media. The amount of styrene monomer and UNPES were changed and the POP with optimum properties was selected. The successful synthesis of POP was approved by Fourier transform infrared spectroscopy (FTIR), proton nuclear magnetic resonance spectroscopy (1H NMR), and gel permeation chromatography (GPC). The spherical morphology of selected POP with a diameter of about 500 nm was confirmed by scanning electron microscopy (SEM) and dynamic light scattering (DLS) analysis. MPUFs containing different amounts of POP (10, 30, 50, and 100 %) as polyester polyol parts were prepared. It was found that mechanical properties including tensile strength: 3500 KPa, elongation at break%: 350% and soundproofing properties with acoustic activity of 0.72 were obtained when the POP content of the MPUF was fixed at 30%. The cell-opening behavior of POP in polyester-based MPUF was studied using SEM. It was found that the average of the open cells’ size and their population were increased as the POP content increased. Such MPUFs can be effective in successful mechanical and acoustic damping in the automotive industry.

Preparation and Modification of Flexible Polyurethane Foam for Effective Flame Resistance and Sound Absorption

Polyurethane foam as an important sound absorption material is limited by the poor flame resistances in building field, but the modifications of flame resistances tend to have adverse effects on the sound absorption performance. Herein, dibutyltin dilaurate and triethylenediamine are used simultaneously as catalysts, and four new types of flame retardant polyether polyols (FPMPO) are synthesized and combined with modified expanded graphite (PEG) to prepare the flame resistance flexible polyurethane foam (FFPUF) by one-step method. The results show that the combination of the two catalysts can control the cell structure of FFPUF availably for sound absorption. The FPMPO have little negative influence on the cell morphology and the sound absorption performance of FFPUF, but the increase of flame resistances is finite due to the limited amount of FPMPO. In order to improve the flame retardant properties further, the FPMPO and the PEG are combined in the modification. Benefitting by the effective control structure and the modification with composite flame retardant, the FFPUF shows excellent sound absorption and flame retardant properties. The LOI value of FFPUF is 33.4 and the vertical burning level reaches V-0, and the average sound absorption coefficient maintains 0.68 in the 800-6300 Hz range.