Mechanical properties of a STF capsule filled flexible polyurethane composite foam

Liu, Xing; Huo, Junli; Li, Tingting; Wang, Hongyang; Wu, Liwei; Lin, Jia‐Horng; Lou, Ching‐Wen

doi:10.1016/j.matlet.2020.127580

Cited by 17 publications

(8 citation statements)

References 12 publications

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“…Using STF-filled polyurethane foam (Figure 4B) has also been an effective strategy. 36,40 Zhang et al 41 investigated an STF capsule-modified composite; the authors demonstrated that the energy absorption capacity of silica gel was substantially enhanced by adding STF capsules. Compared with STF, STG has better formability (Figure 4C).…”

Section: Flexible Matrixmentioning

confidence: 99%

“…In the study by Wu et al, 35 STF was sealed in a polyurethane grid as the core material of sandwich composites to limit its mobility, and its structure is shown in Figure 4A. Using STF‐filled polyurethane foam (Figure 4B) has also been an effective strategy 36,40 . Zhang et al 41 investigated an STF capsule‐modified composite; the authors demonstrated that the energy absorption capacity of silica gel was substantially enhanced by adding STF capsules.…”

Section: Three‐dimensional Woven Fabric Structure and Flexible Matrixmentioning

confidence: 99%

“…Strategies for limiting STF mobility and composite preparation processes: (A) STF composite preparation process using polyurethane mesh encapsulation 35 ; (B) PU‐encapsulated STF capsule composite preparation process 36 ; (C) Morphology and fluidity of shear thickening gel 37 ; (D) The neat Twaron CT709 fabric and the coated Twaron fabric 38 ; (E) Dimensional diagram of the sandwich structure 39 …”

Section: Three‐dimensional Woven Fabric Structure and Flexible Matrixmentioning

confidence: 99%

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Structural design and impact resistance of three‐dimensional structure‐reinforced flexible polymer composites

Zhang

Yan

et al. 2022

Polymers for Advanced Techs

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Three‐dimensional (3D) structure‐reinforced flexible polymer composites have great potential as personal protective materials. These composites exhibit excellent mechanical properties and failure mechanisms than typical rigid composites because of the complex dynamic reaction processes caused by the 3D structure in response to impact. This paper comprehensively reviews the impact resistance mechanism of 3D structure‐reinforced flexible polymer composites by combining current results with relevant investigations. 3D woven fabric reinforcements and flexible matrix materials of flexible polymer composites systems are presented in this paper. The classification for 3D woven fabric reinforcements is reviewed, as well as the effect of reinforcement structures on the impact resistance of the flexible composites. Furthermore, several flexible matrix are introduced. Several external factors affecting the impact resistance of composites are then discussed. Finally, the impact damage mechanism of 3D structure‐reinforced flexible polymer composites is summarized and analyzed.

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Section: Flexible Matrixmentioning

confidence: 99%

Section: Three‐dimensional Woven Fabric Structure and Flexible Matrixmentioning

confidence: 99%

Section: Three‐dimensional Woven Fabric Structure and Flexible Matrixmentioning

confidence: 99%

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Structural design and impact resistance of three‐dimensional structure‐reinforced flexible polymer composites

Zhang

Yan

et al. 2022

Polymers for Advanced Techs

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“…Other impact protective composites include: steel plate backed with an STF impregnated open-cell polyurethane (PU) foam which was designed to protect against standard blast load 63 , composite which was produced by in situ formation of closedcell PU foams with STF which was also used as an approach to encapsulate STF 64 , an ecofriendly composite made by engraving micro-agglomerated cork sheets with various microfluidic patterns and filling them with STF 65 , STF-filled sandwich composite panels with carbon fiber reinforced plastic facings 66 , PU skeleton (with cubic holes in it) filled with STF sandwich composite 67,68 , composites where STF is intercalated in a spacer fabric and incapsulated in a polyethylene (PE) copolymer shell for a football helmet padding 69 .…”

Section: Stf Composites For Impact Absorptionmentioning

confidence: 99%

“…Some other approaches have been tried in the literature, such as Zhang et al 71 developed an approach on how to produce double-wall Though in both encapsulation approaches resulted, capsules were fragile and could not withstand repetitive impacts. These capsules could provide one-time protection only or be used to transport STF into another composite as it was used by Liu et al 64 where the produced STF capsules with sodium alginate shells were incorporated in polyurethane foam on a stage of mixing polyol with isocyanate. This creates a great challenge to produce a durable yet flexible shell for STF capsules.…”

Section: Encapsulation Of Stfmentioning

confidence: 99%

Impact absorption in shear-stiffening materials

Куркин¹

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Two‐step foaming process for fabrication of flexible polyurethane foam composites with spring‐like air‐layer structure

Lou,

Chu,

Liu

et al. 2023

J of Applied Polymer Sci

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Due to its exceptional mechanical properties, polyurethane (PU) foam has found wide application in various fields. Microcellular foaming not only reduces weight but also enhances the cushioning properties of PU. However, current foaming methods have limitations in improving performance. Therefore, this study aimed to construct spring‐like sandwich‐structured flexible PU foam composites (SFFCs). These composites were prepared using a two‐step foaming method, utilizing a precise amount of polyol and isocyanate as raw materials, at room temperature (28–35°C). In the preparation process, warp‐knitted spacer fabrics (WKSFs) with spring‐like structures were encapsulated in the middle layer, while the top and bottom layers consisted of PUF (flexible PU foam with different ring radius differences) formed through the foaming process of polyol and isocyanate. The study focused on investigating the influence of the ring radius difference (r = 1, 1.5, 2) and the two‐layer layout (staggered, diagonal, overlapping) of the WKSFs on the compression and cushioning properties. The experimental results revealed a significant improvement in the mechanical properties of the PU with the incorporation of WKSFs. Particularly noteworthy was the excellent cushioning performance exhibited by the two‐layer WKSFs sample, RPUS‐1, in the dynamic impact test. RPUS‐1 absorbed 94.3% of the energy and reduced the impact value to 3921 N, which is 848 N (17.7%) lower than that of PU foam. Furthermore, even after 20 cycles of compression testing, the SFFCs retained excellent compressive properties, with the compressive stress only decreasing from 0.34 to 0.19 MPa. In conclusion, this study expands the application of PU in cushioning, demonstrating their potential in providing improved cushioning properties.

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Mechanical properties of a STF capsule filled flexible polyurethane composite foam

Cited by 17 publications

References 12 publications

Structural design and impact resistance of three‐dimensional structure‐reinforced flexible polymer composites

Structural design and impact resistance of three‐dimensional structure‐reinforced flexible polymer composites

Impact absorption in shear-stiffening materials

Two‐step foaming process for fabrication of flexible polyurethane foam composites with spring‐like air‐layer structure

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