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Exceptionally flame-retardant flexible polyurethane foam composites:synergistic effect of the silicone resin/graphene oxide coating

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Frontiers of Chemical Science and Engineering 2021年第4期15卷 969-983页

作者： Qian Wu Jincheng Zhang Shengpeng Wang Bajin Chen Yijun Feng Yongbing Pei Yue Yan Longcheng Tang Huayu Qiu Lianbin Wu Key Laboratory of Organosilicon Chemistry and Materials Technology of Ministry of Education Hangzhou Normal UniversityHangzhou 311121China Collaborative Innovation Center of Zhejiang Province for Manufacturing of Fluorine Silicon Fine Chemicals and Materials Hangzhou Normal UniversityHangzhou 311121China Transfar Zhilian Co. Ltd.Hangzhou 311215China

A facile strategy was developed to fabricate flexible polyurethane(PU)foam composites with exceptional flame *** approach involves the incorporation of graphene oxide(GO)into a silicone resin(SiR)solution,which is then deposited onto a PU foam surface via the dip-coating technique and ***-transform infrared spectroscopy,scanning electron microscopy,and Raman spectroscopy measurements demonstrated that the SiR and GO were successfully coated onto the PU skeleton and the intrinsic porous structure of the PU foam remained *** effects of SiR and GO on the mechanical and thermal stability and flame retardancy of PU composites were evaluated through compression tests,thermogravimetric analysis,vertical combustion tests,and the limiting oxygen *** measurement results revealed that the composites(PU@SiR-GO)showed superior flame retardancy and thermal and mechanical stability compared to pristine PU or PU coated with SiR *** mechanical and thermal stability and the flame-retardant properties of the PU composites were enhanced significantly with increasing GO *** on the composition,microstructure,and surface morphology of PU@SiR-GO composites before and after combustion tests,a possible flame-retardance mechanism is *** work provides a simple and effective strategy for fabricating flame retardant composites with improved mechanical performance.

关键词： flame retardancy flexible polyurethane foam graphene oxide silicone resin

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Improving the Sound Absorption Properties of flexible polyurethane (PU) foam using Nanofibers and Nanoparticles

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Sound & Vibration 2019年第5期53卷 207-222页

作者： Roohalah Hajizadeh Ali Khavanin Mohammad Barmar Ahmad Jonidi Jafari Somayeh Farhang Dehghan Department of Occupational Health Engineering Faculty of Medical SciencesTarbiat Modares UniversityTehranIran Department of polyurethane Iran Polymer and Petrochemical InstituteTehranIran Research Center for Environmental Health Technology Department of Environmental Health EngineeringIran University of Medical SciencesTehranIran Department of Occupational Health and Safety at Work Workplace Health Promotion Research CenterSchool of Public Health and SafetyShahid Beheshti University of Medical SciencesTehranIran

polyurethane foam as the most well-known absorbent materials has a suitable absorption coefficient only within a limited frequency *** aim of this study was to improve the sound absorption coefficient of flexible polyurethane(PU)foam within the range of various frequencies using clay nanoparticles,polyacrylonitrile nanofibers,and polyvinylidene fluoride *** response surface method was used to determine the effect of addition of nanofibers of PAN and PVDF,addition of clay nanoparticles,absorbent thickness,and air gap on the sound absorption coefficient of flexible polyurethane foam(PU)across different frequency *** absorption coefficient of the samples was measured using Impedance Tubes *** clay at low thicknesses as well as polyacrylonitrile nanofibers and polyvinyl fluoride nanofibers at higher thicknesses had a greater positive effect on absorption *** mean sound absorption coefficient in the composite with the highest absorption coefficient at middle and high frequencies was 0.798 and 0.75,*** comparison with pure polyurethane foam with the same thickness and air gap,these values were 2.22 times at the middle frequencies and 1.47 times at high frequencies,*** porosity rose with increasing nano clay,but decreased with increasing polyacrylonitrile nanofibers and polyvinyl fluoride *** results indicated that the absorption coefficient was elevated with increasing the thickness and air *** study suggests that the use of a combination of nanoparticles and nanofibers can enhance the acoustic properties of flexible polyurethane foam.

关键词： Sound absorption coefficient flexible polyurethane foam nano clay polyacrylonitrile nanofibers polyvinyl fluoride nanofibers

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Cushioning Performance of a Novel polyurethane foam Material Applied in Fragile Packaging

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Acta Mechanica Solida Sinica 2024年第3期37卷 487-497页

作者： Huifeng Xi Chunqiu Guo Jinbiao Yang Xiaogang Wang Bowei Wang Shiqing Huang Zhiwei Wang School of Mechanics and Construction Engineering Jinan UniversityGuangzhou510632China College of Packing Engineering Jinan UniversityZhuhai519070China MOE Key Lab of Disaster Forecast and Control in Engineering Jinan UniversityGuangzhou510632China Foshan Soft Valley Technology Co. Ltd.Foshan528000China

For fragile products,packaging requires cushioning protection to prevent irreversible damage from accidental falls,transportation impacts,and other *** new polyurethane foam(PUF)material demonstrates superior cushioning and vibration isolation performance in practical applications,effectively minimizing damage from *** and vibration experiments were conducted on packages comprising novel PUF,expandable polyethylene,ethylene-vinyl acetate copolymer foam,and *** verify that the new PUF material outperforms in cushioning and vibration isolation,as observed from the acceleration ***,a random vibration analysis of a packaging unit involving different thicknesses of PUF materials and bracelets reveals the enhanced vibration isolation effect within a specific thickness *** vibration results of the bracelet’s outer packaging align closely with finite element simulation results,validating the effectiveness of designing and optimizing the outer *** finite element simulation,deeper understanding and prediction of the bracelet’s vibration response under various conditions is achieved,facilitating optimized packaging design for better protection and vibration damping.

关键词： flexible polyurethane foam Packaging of fragile goods Nonlinear dynamics Vibration frequency Finite element simulation

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