POLYMER DEGRADATION AND STABILITY
·
2025
·
IF 7.4
Yan Liu,Yanjun Zhu,Jie Chen,Yongqian Shi,Yijie Zhang,Libi Fu,Longcheng Tang,Jiefeng Gao,Pingan Song,Ting Qiu
In extreme environments, the simultaneous presence of mechanical impact and fire hazards poses significant challenges for single flexible polyurethane foam (FPUF) protective materials. To address these limitations, we developed an innovative multilayer coating structure for FPUF using a simple dip-drying method. This structure comprises a polydopamine (PDA) base layer, an intermediate layer containing ammonium polyphosphate (APP), carboxymethyl chitosan (CMC), and halloysite nanotubes (HNT), and a top layer of polydimethylsiloxane (PDMS). The multilayer coating significantly enhanced the cushioning and flame-retardant properties of FPUF. At a coating loading of 35 wt.%, the FPUF@PDA/A-C-H/PDMS exhibited a compressive strength 3.52 times higher than pure FPUF, with only a 10.2% decrease after 100 compression cycles. The composite effectively dissipated 95.7% of an impact energy of 1.22 J, achieving a 97.1% impact force dissipation rate and significantly extending cushioning duration. The FPUF@PDA/A-C-H/PDMS demonstrated self-extinguishing properties after 10 s of exposure to a butane flame, maintaining structural integrity. Moreover, its peak heat release rate was reduced by 68.8%. The multilayer coating also improved hydrophobicity and thermal insulation. This multifunctional foam composite shows great potential for enhancing the performances of FPUF in hazardous environments, offering robust protection in extreme conditions.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Research Express
·
2019
·Vol. 6
·期 12
·125312
·
IF 1.449
Maoyong Zhi,Quanyi Liu,Shansong Gao,Yinlong Zhao,Xinhua Zhu,Xuhong Jia
A novel three bilayers nanocoating containing MoS2 nanosheets and C60 was constructed on the surface of flexible polyurethane (FPU) foam by a layer-by-layer assembly method. MoS2 nanosheets were prepared by ultrasonic-assistant exfoliation method in a mixed solvent of N-Methyl-2-pyrrolidinone (NMP) and aqueous hydrogen peroxide (30% H2O2). MoS2-C60/FPU foam was prepared by alternately submerging the FPU foam into C60/guargum and MoS2/sodium alginate suspensions. Scanning electron microscopy (SEM) characterization showed that MoS2 nanosheets and C60 nanoparticles were uniformly distributed on the surface of FPU foam matrix. Thermogravimetric analysis demonstrated that MoS2-C60/FPU foam exhibited better thermal stability than the control FPU foam. Cone calorimeter test results revealed that MoS2-C60/FPU foam with the incorporation of 5.24 wt% MoS2-C60 nanocoating had a remarkable reduction in peak heat release rate (pHRR, 47.5% reduction), total heat released (THR, 51.1% reduction) and total smoke production (TSP, 33.1% reduction) compared with those of the control FPU foam. Furthermore, the morphology and structure of char residue after cone calorimeter test were investigated by SEM and Raman spectroscopy. The possible flame-retardant mechanism of MoS2-C60/FPU foam was proposed, and this significant improvement in flame retardancy could be ascribed to the insulating barrier and adsorption effect of MoS2 nanosheets, free radicals-trapping ability of C60 in condensed phase, and the catalytic carbonization effect of the MoS2-C60 nanocoating. This work provides a new approach for producing high quality flame retardant polyurethane foam materials.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Delai Jiao,Haofei Sima,Xiaolin Shi,Chunling Zhang,Bo Liu
In this work, a mussel-inspired flame retardant containing a catechol moiety, was synthesized, which was used to coat flexible polyurethane foam (FPUF). The influence of the coating time, coating temperature, and flame retardant concentration on the coating thickness and morphology were investigated. When the temperature is 45 °C, and the coating time is 3 days and the concentration is 3 mg/mL, the peak heat release rate (PHRR) of the coated FPUF decreases by 44.2 %, and the combustion time was significantly prolonged. This is because catechol contains a large number of hydroxyl groups, and the flame retardant coating formed after polymerization contains a large amount of carbon sources. Additionally, the phosphorus element in DPDHPP has a catalytic effect on carbon formation, which can form a phosphorus rich 3D network carbon layer in the condensed phase during combustion. Catechol and P-containing free radicals can produce quenching effects in the gas phase, reducing the active free radicals in the air. The flame retardant coating formed not only significantly improves the flame retardant performance of FPUF, but also has no adverse effect on the compression properties of the FPUF.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 137
·期 48
·49591
·
IF 2.52
Jiaji Cheng,Shaoshuai Niu,Dan Ma,Yue Zhou,Feng Zhang,Wenjuan Qu,Dong Wang,Shaoxiang Li,Xinlong Zhang,Xianqun Chen
In this article, a flame retardant microcapsule ammonium polyphosphate microencapsulated by polyurea (POAPP) was successfully synthesized by interfacial polymerization method using ammonium polyphosphate (APP) as core and polyurea as shell. The microencapsulation is observed by scanning electron microscopy and characterized by Fourier transform infrared spectroscopy, thermogravimetric analysis and hydroscopicity test, which prove the success in synthesizing microencapsulation. When the POAPP is added into rigid polyurethane foam (RPUF), the flame retardant and mechanical properties are investigated using cone calorimeter, limited oxygen index test, and compressive strength test. The PHRR of RPUF-POAPP20 decreased from 336.52 kW/m 2 (Ref. RPUF) to 203.84 kW/m 2 and the THR of RPUF-POAPP20 was only 7.6 MJ/m 2 , which is 33.9% lower than that of Ref. RPUF. Furthermore, the limiting oxygen index of RPUF-POAPP20 reaches 24.8%, which increased by 36.3% compared to Ref. RPUF. Whereas the maximum compressive strength of RPUF-POAPP5 was 7.46 MPa, which is higher than that of RPUF-APP5.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Foods
·
2024
·Vol. 13
·期 12
·1911
·
IF 4.7
Le Wang,Jianguang Liu,Yan Shen,Yanli Yin,Zifu Ni,Jun Xi,Yuansen Hu,Qipeng Yuan
The preparation of a novel composite carrier of polydopamine-modified carbon fiber/polyurethane foam (PDA-CF/PUF) was proposed to improve cell immobilization and the fermentation of xylitol, which is an important food sweetener and multifunctional food additive.Candida tropicaliswas immobilized on the composite carrier by adsorption and covalent binding. The properties and immobilization mechanism of the composite carrier and its effect on immobilized cells were investigated. It showed that the modification of PDA enhanced the loading of CF on the PUF surface and the adhesion of cells on the composite carrier surface. Also, the biocompatibility of carriers to cells was improved. In addition, the introduction of PDA increased the active groups on the surface of the carrier, enhanced the hydrophilicity, promoted the cells immobilization, and increased the xylitol yield. It was also found that expression of the related gene XYL1 in cells was significantly increased after the immobilization of the PDA-CF/PUF composite carrier during the fermentation. The PDA-CF/PUF was an immobilized carrier with the excellent biocompatibility and immobilization performance, which has great development potential in the industrial production of xylitol.
研究领域:
生物技术
·
食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 136
·期 29
·47839
·
IF 2.188
Xiaoqing Qiu,Zhiwei Li,Xiaohong Li,Laigui Yu,Zhijun Zhang
We first prepared a novel hexagonal boron nitride (h-BN) nanosheet filled flame-retardant coating on the surface of flexible polyurethane foams (FPUFs) by a layer-by-layer assembly method to improve the fire safety of the FPUFs. The microstructures and compositions of the coatings could be well tailored by the alteration of the concentrations of the h-BN dispersions; this resulted in obvious improvements in the thermal stability and flame-retardant properties for the FPUFs under optimal conditions. Particularly, cone calorimetry testing confirmed that the FPUFs coated with a proper amount of h-BN nanosheets effectively reduced the peak of the heat-release rate (50.1%) and CO production (53.8%) of the FPUFs, which demonstrated excellent flame-retardant performance. The excellent flame-retardant properties were attributed to the physical barrier and tortuous-path effects and anisotropic thermal conductivity of the h-BN nanosheets; these retarded the transfer and diffusion of heat toward the polymer matrix. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47839.
研究领域:
材料科学
·
防火安全
✓ 已验证
产品关联
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2021
·Vol. 32
·期 11
·4531-4546
·
IF 3.665
Sujie Yang,Bing Zhang,Mengru Liu,Yadong Yang,Xinliang Liu,Depeng Chen,Bibo Wang,Gang Tang,Xiuyu Liu
Using phytic acid (PA) and piperazine (Pi) as raw materials, piperazine phytate (PA-Pi) was fabricated by simple ionic reaction. Furthermore, A series of rigid polyurethane foam/piperazine phytate (RPUF/PA-Pi) composites were prepared by one-step water-blown technology. Thermogravimetric (TG) results showed that the addition of PA-Pi improved the thermal stability of RPUF/PA-Pi composites at high temperature. At 700°C, RPUF/PA-Pi20 exhibited the highest carbon residue of 25.8 wt%. Cone calorimetry and smoke density tests suggested that PA-Pi could reduce the heat and smoke release during combustion process of the composites, thus reducing their fire hazard. Thermogravimetric-Fourier transform infrared spectroscopy (TG-FTIR) indicated that PA-Pi significantly inhibited the release of toxic gases (isocyanate compounds, aromatic compounds, CO and HCN) and flammable gases (hydrocarbons and esters) during the decomposition process of RPUF/PA-Pi composites, effectively improving fire performance of the composites. Scanning electron microscope (SEM), Raman and Fourier transform infrared spectroscopy (FTIR) were used to characterize the carbon residue of RPUF/PA-Pi composites. The results showed that PA-Pi could promote the formation of dense carbon layer of composites and effectively prevented heat and mass transfer in the combustion process.
研究领域:
材料科学
·
燃烧学
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2024
·Vol. 16
·期 2
·229
·
IF 4.7
Zhenyu Zhang,Guangyao Shen,Rongbo Li,Lei Yuan,Hongfu Feng,Xiuming Chen,Feng Qiu,Guangyin Yuan,Xiaodong Zhuang
Soft materials bearing rigid, lightweight, and vibration-dampening properties offer distinct advantages over traditional wooden and metal-based fillings for spent fuel transport casks, due to their low density, tunable structure, excellent mechanical properties, and ease of processing. In this study, a novel type of rigid polyurethane foam is prepared using a conventional polycondensation reaction between isocyanate and hydroxy groups. Moreover, the density and size of the pores in these foams are precisely controlled through simultaneous gas generation. The as-prepared polyurethane exhibits high thermal stability exceeding 185 °C. Lifetime predictions based on thermal testing indicate that these polyurethane foams could last up to over 60 years, which is double the lifetime of conventional materials of about 30 years. Due to their occlusive structure, the mechanical properties of these polymeric materials meet the design standards for spent fuel transport casks, with maximum compression and tensile stresses of 6.89 and 1.37 MPa, respectively, at a testing temperature of −40 °C. In addition, these polymers exhibit effective flame retardancy; combustion ceased within 2 s after removal of the ignition source. All in all, this study provides a simple strategy for preparing rigid polymeric foams, presenting them as promising prospects for application in spent fuel transport casks.Keywords:polyurethane foam;fillings;long service life;spent fuel;flame retardance
研究领域:
材料科学
·
核能工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Polymer-Plastics Technology and Materials
·
2019
·
IF 0
Ying Pan,Hongting Zhao
In this study, flexible polyurethane foam (FPUF) was modified with bio-based coatings composed of polyethylenimine (PEI) and alginate (ALG), fabricated by layer-by-layer (LbL) self-assembly. LbL self-assembled coatings modified FPUFs were studied for their potentials for removing Cu2+ ions from aqueous solutions by using batch adsorption technique, as a function of assembled bilayers number, pH value, carrier amount and adsorption time. The maximum adsorption capacity of the modified FPUF was shown to be 54 mg/g for Cu2+. Results suggested that the LbL self-assembly could potentially be a promising cost-effective technique for fabricating advanced adsorbent materials for removing pollutants from wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Xianzhu Ye,Jing Hu,Bin Li,Min Hong,Yafei Zhang
Strengthened conductive shielded graphene/nano-Cu/crosslinking polyurethane (CPU) foam with ultrahigh interfacial functions was newly fabricated, involving the use of nano-assembly-freeze extraction route. The 3D supported modified graphene-nano-Cu (GC) interface were analyzed and verified efficiently by FTIR, XRD, XPS spectra and SEM, TEM images. Towards the CPU foams doped with GC network, surface polarity was weakened efficiently, and the anti-permeation efficiency was significantly improved due to the special positive piling behaviors of nanosheets. The initial decomposition temperature (enhanced by ∼22.2%) was efficiently delayed on account of heat transfer and doping protection. Thermal conductivity consistently fitted with modified Maxwell-Garnett method (D ∼ 5, K p /Km ∼ 1000) was increased by ∼338% due to the collaborative formation of phonon-electron transmission network. More importantly, the electric conductivity was increased by orders of magnitude, along with the verification of 3D synergistic transmission network using percolation threshold. As compared to the pure CPU material, a maximum electromagnetic interference shielding (EMI) effectiveness of over 55 dB in the frequency range of 0–9 GHz was demonstrated on the interface with only ∼0.87 vol% GC doping. All these suggest that the CPU foams simply doped with characteristic GC possesses a great potential to be used as lightweight, highly conductive, anti-penetrative and stable anti-interference materials.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Yubin Huang,Saihua Jiang,Runcan Liang,Ping Sun,Yun Hai,Lei Zhang
The use of intumescent flame-retardant (IFR) coatings is one of the most highly effective methods for polymeric materials to improve their fire safety. However, organic IFR coatings show “negative effect” in a large amount of heat and smoke release during the char-forming process. Developing nanocomposite coatings that can reduce their “negative effect” and simultaneously enhance the barrier effect of fireproof char layer is particularly desirable. Herein, a novel UV-curable IFR/MXene nanocomposite coating was developed by incorporation of surface-modified MXene nanosheets in the IFR coating system, and then constructed on the surface of rigid polyurethane (RPU) foam to fabricate coated RPU foams via spray-coating and UV-cured process. The IFR/MXene coated RPU foams show a fast self-extinguished behavior and a remarked decrease in heat and smoke production, indicating the great improvement of RPU fire safety in building. The fireproof layers combined with expanded char and MXene jammed networks generated rapidly during combustion can serve as physical shield to effectively delay the release of heat and volatile products, protecting the underlying substrate from further burning. Moreover, the mechanical properties and dispersion are enhanced due to the co-cross-linking networks between the IFR coating and MXene nanosheets. As a new member of the 2D nanomaterials, MXene nanosheets have potential to be a new choice for developing high-performance nanocomposite coating for polymers to reduce their risk of fire hazard.
研究领域:
材料科学
·
消防安全
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2020
·Vol. 12
·期 1
·107
·
IF 3.426
Qinqin Zhang,Xiaoqi Lin,Weisheng Chen,Heng Zhang,Dezhi Han
Many achievements have been made on the research of composite polyurethane foams to improve their structure and mechanical properties, and the composite foams have been widely utilized in building insulation and furniture. In this work, rigid polyurethane foams (RPUFs) with the addition of different fillers (nano-SiO2, peanut shell, pine bark) were prepared through the one-step method. The effects of inorganic nano-SiO2and organic biomass on foam properties were evaluated by means of physical and chemical characterization. The characterization results indicate that the compressive strength values of prepared foams could fully meet the specification requirement for the building insulation materials. The inorganic and organic fillers have no effect on the hydrogen bonding states in composite RPUFs. Furthermore, compared to the biomass fillers, the addition of nano-SiO2greatly influenced the final residual content of the fabricated foam. All composite foams exhibit closed-cell structure with smaller cell size in comparison with the parent foam. The prepared composite foams have the potential for utilization in building insulation.Keywords:rigid polyurethane foam;peanut shell;pine bark;nano-SiO2;insulation materials
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）