Flexible polyurethane foam‐based sandwich composites: Preparation and evaluation of thermal, acoustic, and electromagnetic properties

Abstract

This study proposes producing sandwich composites that have functionalities in addition to good mechanical properties. Flexible polyurethane (FPU) foam is used as the core, whereas nonwoven fabrics are used as the top and bottom panels. The functionalities, including flame‐retardant (FR) efficacy, acoustic absorption, and electromagnetic shielding effectiveness (EMSE), help in expanding the application fields. In this study, FR agent is added to FPU foam to form the core, while the low‐melting point polyethylene terephthalate (LPET) nonwoven fabric with/without carbon fiber (CF) fabric is used as panels. One‐step molding and hot pressing are used to make these materials into LPET/FPU and CF‐LPET/FPU sandwich composites. The cell structure of the FPU foam is examined, after which the limit oxygen index (LOI), the compression modulus, and heat insulation efficacy of LPET/FPU sandwich composites are examined, thereby examine the influence of FR agent. The test results show that the mechanical properties of sandwich composites are dependent on the amount of FR agent. Using 50 wt %, FR agent provides LPET/FPU sandwich composites with an optimal LOI of 28. In addition, the combination of CF fabric further provides CF‐LPET/FPU composite sandwich with the maximum acoustic absorption coefficient of 0.90376 and an optimal EMSE of 50 dB. The proposed sandwich composites have functionalities of FR efficacy, acoustic absorption, heat insulation, and EMSE and thus are qualified for protective partitions used in karaoke and kindergartens. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46871.

Polyurethane: Recent Engineering Contributions

“…Sandwich composites made of a core of flexible PU foam and nonwoven poly (ethylene terephthalate) as the top and bottom panels were produced. The research found that such composites have functionalities of FR efficacy, acoustic absorption, heat insulation, electromagnetic shielding effectiveness and thus are suited for protective partitions [74].…”

Halogen‐Free Coatings Combined with the Synergistic Effect of Phytic Acid and Montmorillonite for Fire Safety Flexible Polyurethane Foam

“…Three regions are occurring: a linear elastic response under a low-strain, a moderate deformation and plateau, and densification with the increasing of stress. [1,55] Meanwhile, diverse proportions of flame-retardant coatings have different effects on the flexibility of FPUF. According to Figure 13, MMT/FPUF shows the worst behavior, resulting from the rigid inorganic MMT.…”

Nitrogen/phosphorus synergistic flame retardant-filled flexible polyurethane foams: microstructure, compressive stress, sound absorption, and combustion resistance

“…30 When the molten material was dropped, a large amount of heat was released, which lowered the temperature of the burning sample and then enhanced the ame retardant effect. 31 Besides, these molten drips also covered the surface of other materials, preventing the burning gas from entering the materials and inhibiting further combustion.…”