Shear thickening gel reinforced flexible polyurethane foam and its enhanced properties

Liu, Xiaoke; Yu, Kejing; Fu, Qianqian; Qian, Kun

doi:10.1088/1361-665x/ab0be8

Cited by 18 publications

(6 citation statements)

References 32 publications

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“…The B O crosslinking bond theory [15,23,24] states that a B O crosslinking is formed between electron-rich oxygen (O) atoms and boron (B) atoms with empty P orbitals by sharing electrons (Figure 1B) and the mechanical properties of materials caused by the formation and fracture of B O crosslinking bonds. [25,26] A modest strain rate applied to the STG will impose a viscous condition on the material, allowing the molecular chains to detangle and a few B O crosslinking bonds to break (Figure 1B(b-e)), resulting in the material displaying plasticity. However, if the strain continues, the material will change from its initial viscous state to a rubbery state (Figure 1A(b)), and the material will exhibit elasticity.…”

Section: Shear-thickening Mechanismsmentioning

confidence: 99%

Novel shear thickening gel/high‐performance fiber reinforced flexible composites: Multi‐velocity impact and functional properties

Liu

Wei

et al. 2023

Polymer Composites

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Shear thickening gel (STG) is a promising substrate used for flexible protective materials, which has superior dimensional stability without gel side leakage and delamination when sustaining long-standing time. STG/high-performance fiber flexible composites exhibit high-energy absorption capacity for multivelocity impact. This article reveals the shear thickening mechanism of STG that lays a theoretical foundation for the performance analysis of STG composites. The preparation methods of STG/high-performance fiber flexible composites, including impregnation, hand lay-up, filling, and lamination methods, are compared. The energy absorption principle of STG/high-performance fiber flexible composites on multi-velocity impact and the destruction morphology was analyzed. The coupling effects and functional applications of STG functional composites with nanoparticles, magnetic particles, and conductive particles are summarized. It provides more suitable conditions for designing new multifunctional protective equipment and manufacturing advanced intelligent, protective devices.

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Section: Shear-thickening Mechanismsmentioning

confidence: 99%

Novel shear thickening gel/high‐performance fiber reinforced flexible composites: Multi‐velocity impact and functional properties

Liu

Wei

et al. 2023

Polymer Composites

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“…Due to unique self-healing and shear-stiffening properties, PBS was found to be particularly useful in impact protective equipment, such as D3O TM foam, which is one of the most known applications of PBS in the market (it is PU foam with PBS as an additional protective compound). [16] PBS is also found in other foam-based composites, [17,18] Kevlar-based composites, [19,20] and double network composites. [2][3][4] Despite the wide range of various PBS composites for impact protection, the potential of PBS itself has hardly been studied.…”

Section: Introductionmentioning

confidence: 98%

Correlations Between Precursor Molecular Weight and Dynamic Mechanical Properties of Polyborosiloxane (PBS)

Куркин

Lipik

Tan

et al. 2021

Macro Materials & Eng

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It is possible to tailor the dynamic response of polyborosiloxanes (PBS) based on picking the right molecular weight of a precursor. The molecular weight of hydroxy-terminated polydimethylsiloxane (PDMS) defines the shear-stiffening performance of PBS due to straightforward condensation reaction between hydroxy end groups of PDMS and boric acid. Introduced borono groups behave as stickers, hence, are prone to supramolecular interactions. New correlations are discovered for five PBS synthesized from hydroxy-terminated PDMS with different molecular weights. Si─O─B infrared band intensities for all PBS follow the same trend with molecular weight as the number of PDMS hydroxy groups which confirms the full completion of the reaction. After synthesis, the molecular weight of PBSs remained almost the same, which indicates the absence of significant chain scissoring, polymerization, or crosslinking. During the rheological analysis, it is found that crossover point modulus follows the same trend as the number of PDMS hydroxy groups and Si─O─B band intensities. PBS demonstrates a linear increase in peak forces with molecular weight during the drop weight impact test. The low molecular weight of a precursor, hence, a high number of stickers is a primary requirement for effective protection against low-velocity impact.

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“…[1][2][3][4][5][6]. Several work have been reported to show the higher ballistic performance of shear thickening fluid treated Kevlar fabric compared to neat Kevlar [7][8][9][10][11]. Shear thickening fluids have become the potential fluid in different areas like; soft armor, automotive vibration damping, nanofinishing etc.…”

Section: Introductionmentioning

confidence: 99%

Energy absorption of graphene and CNT infused hybrid shear thickening fluid embedded textile fabrics

2021

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In the present work, two most important hybrid shear thickening fluids (STFs) are synthesized and embedded into the untreated Kevlar (04 and 08 layers) to promote the impact performance. The experiments are performed to investigate the various impact parameters such as ballistic limits, residual velocities, energy absorption, etc. of different samples (untreated Kevlar and CNT & Graphene infused hybrid STF treated Kevlar). The maximum energy absorption is found to be about 66 J corresponding to the 152.3 m/s initial velocity for 08 layered Graphene hybrid STF treated Kevlar sample, which shows graphene as the best candidate to promote ballistic protection compared to CNT. The results reveal a higher impact performance of Graphene hybrid STF treated samples compared to CNT hybrid STF treated and untreated samples. The experimental data are also validated with the theoretical data and good compliance within around 20% accuracy is found between the data. The present findings can have potential for several applications like soft armor, stab resistance, damper, etc.

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Shear thickening gel reinforced flexible polyurethane foam and its enhanced properties

Cited by 18 publications

References 32 publications

Novel shear thickening gel/high‐performance fiber reinforced flexible composites: Multi‐velocity impact and functional properties

Novel shear thickening gel/high‐performance fiber reinforced flexible composites: Multi‐velocity impact and functional properties

Correlations Between Precursor Molecular Weight and Dynamic Mechanical Properties of Polyborosiloxane (PBS)

Energy absorption of graphene and CNT infused hybrid shear thickening fluid embedded textile fabrics

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