Article
Polymer Science
Pengfei Jia, Wenhua Cheng, Jingyi Lu, Zhenting Yin, Zhoumei Xu, Liang Cheng, Yong Qiu, Lijun Qian, Yuan Hu, Weizhao Hu, Bibo Wang
Summary: The binary hybrid nanocoating consisting of graphene oxide and octaamino polyhedral oligomeric silsesquioxane has shown significant improvement in enhancing the flame retardancy and smoke suppression properties of flexible polyurethane foam. The hybrid FPUF exhibits better combustion characteristics and mechanical properties, providing better safety and reliability.
POLYMERS FOR ADVANCED TECHNOLOGIES
(2021)
Article
Chemistry, Physical
Zhenting Yin, Fukai Chu, Bin Yu, Bibo Wang, Yuan Hu
Summary: This study fabricates flexible polyurethane foam (FPUF) composites with superior mechanical properties and flame retardancy by in-situ polymerization of organosilicon and phenyl phosphorus compounds on the surface of Ti3C2Tx (Ti3C2Tx@BPA@PCL). The addition of intrinsic flame retardancy and Ti3C2Tx@BPA@PCL enhances the tensile strength, compression strength, flame retardancy, and anti-fatigue properties of FPUF. The FPUF composites exhibit a significant reduction in peak heat release rate, total heat release, and the production rate of carbon dioxide and carbon oxide, achieving self-extinguishing behavior.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Engineering, Environmental
Ehsan Hamamizadeh, Hassan Asilian Mahabadi, Ali Khavanin
Summary: The present study investigated the effects of adding phenolic aerogel (PA) to flexible polyurethane foam on sound absorption coefficient, morphology, and mechanical properties. The results showed that increasing the concentration of PA led to an increase in the number of open pores and interconnections between cells. The PA/flexible polyurethane foam composite with 0.50 wt% of PA exhibited the highest sound absorption coefficient in the low-frequency range and improved the mechanical properties of FPUF.
JOURNAL OF POLYMERS AND THE ENVIRONMENT
(2022)
Article
Mechanics
Wenfei Ji, Qicheng Zhang, Fernando Alvarez-Borges, Guanjie Yuan, Jeroen Van Duijneveldt, Wuge H. Briscoe, Fabrizio Scarpa
Summary: Flexible polyurethane foam composites with enhanced stiffness and energy dissipation were synthesized by layer-by-layer assembly of nanoclay/chitosan multilayers onto foam struts. The composite foams exhibited significant improvements in mechanical properties and energy dissipation compared to uncoated pristine foam. The layer-by-layer coated foam showed a higher dynamic modulus and reduced impact force transmission, demonstrating its superior performance in energy dissipation.
COMPOSITE STRUCTURES
(2023)
Article
Chemistry, Applied
Shuai Jiang, Meiling Zhang, Mengmeng Li, Jianhua Zhu, Aixiong Ge, Lifang Liu, Jianyong Yu
Summary: By using biopolymer sodium alginate and borate as flame retardants, the flammability of cellulose nanofibril foams was successfully reduced, resulting in higher limited oxygen index and improved mechanical performance.
CARBOHYDRATE POLYMERS
(2021)
Article
Engineering, Multidisciplinary
Yuanlai Fang, Junhuai Xu, Feng Gao, Xiaosheng Du, Zongliang Du, Xu Cheng, Haibo Wang
Summary: The PU-DA-1/1-PANI hydrogel, as a strain sensor, displayed high stretchability, soft modulus, and robust tensile strength. The strain sensors with optimized composition showed ideal conductivity to monitor physical motions precisely, and possess self-healing mechanical performance and conductivity.
COMPOSITES PART B-ENGINEERING
(2021)
Article
Energy & Fuels
Yangui Chen, Hongzhou He, Zhongqing Liu
Summary: This study investigated the combustion behavior and numerical modeling of flexible polyurethane foam, showing that the modeling results are in good agreement with experimental results under specific conditions, but still exhibit some deviations.
Article
Polymer Science
Ching-Wen Lou, Sheng Chu, Peiyao Liu, Xiaomeng Wang, Jia-Horng Lin, Ting-Ting Li
Summary: Polyurethane (PU) foam is widely used in various fields due to its exceptional mechanical properties. This study aimed to construct spring-like sandwich-structured flexible PU foam composites (SFFCs) to enhance the cushioning properties of PU. The incorporation of warp-knitted spacer fabrics (WKSFs) with spring-like structures significantly improved the mechanical properties and cushioning performance of the PU. The SFFCs retained excellent compressive properties even after multiple compression cycles, indicating their potential in providing improved cushioning properties.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Materials Science, Composites
Letizia Verdolotti, Maria Oliviero, Marino Lavorgna, Chiara Santillo, Francesca Tallia, Salvatore Iannace, Shu Chen, Julian R. Jones
Summary: A new organic-inorganic polyurethane-based hybrid material with enhanced thermal and mechanical properties was reported, prepared using a sol-gel approach. The synthesis method involved the preparation of a siloxane precursor, functionalization of traditional polyol, use of suitable catalysts and silicone surfactants, and foaming process. The resulting material showed improved thermal conductivity, stability, and mechanical properties.
COMPOSITES SCIENCE AND TECHNOLOGY
(2021)
Article
Polymer Science
Beatriz Merillas, Alyne Lamy-Mendes, Fernando Villafane, Luisa Duraes, Miguel Angel Rodriguez-Perez
Summary: In this study, silica aerogel composites reinforced with reticulated polyurethane foams were manufactured and characterized. Different drying processes and surface modification steps were employed. The composites dried under supercritical conditions showed the best interaction between matrixes as well as mechanical and insulating properties.
Article
Chemistry, Multidisciplinary
Xiaohua Gu, Shangwen Zhu, Siwen Liu, Yan Liu
Summary: A liquid regenerated polyether polyol was obtained through the degradation of waste PU foam using ethylene glycol and ethanolamine as decrosslinker agents. Silica aerogel was added to the regenerated polyol-based polyurethane foam to prepare aerogel-modified nanocomposites. The analysis of test results showed that the addition of 0.3% SiO2 aerogel resulted in regenerated rigid PU foam with small density, low thermal conductivity, and higher compressive strength, indicating good thermal insulation and strength support properties of the silica aerogel-regenerated polyol-based polyurethane nanocomposites. This study achieved the clean, low-carbon, and high-value utilization of recycled waste polyurethane.
Article
Biochemistry & Molecular Biology
Mingqi Xu, Huayong Luo, Hongwei Rong, Shuhan Wu, Zexin Zheng, Boyuan Chen
Summary: This study reports the preparation of calcium alginate gels-functionalized PUF decorated with AgNPs (CA/PUF@Ag) by in situ reduction of Ag+ ions to form AgNPs with weakly reducing glycerol in CA/PUF composite. The water-adsorbing capacity, chemical structure, crystalline nature, elemental composition and morphologies of the composite were characterized. The antimicrobial efficacy of CA/PUF@Ag was explored through various experiments, showing superior water absorption, lower Ag release concentration, and excellent antibacterial performance.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Polymer Science
Said El Khezraji, Suman Thakur, Mustapha Raihane, Miguel Angel Lopez-Manchado, Larbi Belachemi, Raquel Verdejo, Mohammed Lahcini
Summary: Foam products are one of the largest markets for polyurethane, but current production processes are toxic and environmentally unfriendly. This study synthesized flexible polyurethane foam using a non-toxic bismuth catalyst, which showed improved mechanical properties and thermal stability compared to conventional tin-catalyzed foam. The high solubility and Lewis acidity of bismuth triflate benefits the production of polyurethane foams.
Article
Polymer Science
Gabriel Kiss, Gerlinde Rusu, Geza Bandur, Iosif Hulka, Daniel Romecki, Francisc Peter
Summary: The study showed that using recycled polyol as a replacement for fossil-based polyol in flexible polyurethane foam production can maintain similar physical properties at low density. By optimizing the formulation at high levels of recycled polyol, it is possible to reduce the emission of volatile organic compounds, opening the way for further studies to increase PU waste reutilization and decrease petroleum-based raw materials.
Article
Chemistry, Multidisciplinary
Beatriz Merillas, Fernando Villafane, Miguel Angel Rodriguez-Perez
Summary: A novel synthesis method for polyurethane foam/polyurethane aerogel (PUF-PUA) composites is presented in this study. The effect of foam pore size on the final properties of the composites is investigated. The results show that the foam pore size has a clear influence on density, shrinkage, and thermal conductivity. Inclusion of polyurethane aerogel into the foam skeleton increases the elastic modulus of the composites while maintaining flexibility and recovery ratios. The synthesized PUF-PUA composites exhibit excellent insulating performance.
