Viscoelastic analysis of nano‐barium ferrite reinforced casting polyurethane

Gao, Hanyang; Zhang, Bang; Yang, Fan; Jiang, Jiahao; Hu, Guoxin

doi:10.1002/pc.27083

Cited by 3 publications

(2 citation statements)

References 48 publications

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“…Typically, both the energy storage modulus G' and loss modulus G" gradually increase with the frequency. Meanwhile, the G' is larger than G" in the entire frequency range, indicating that the hydrogel network is completely elastic with a perfect covalent network [24]. In addition, the higher loss tangent (tan δ) is greater than 1 (Figure 2f), which demonstrates that the hydrogel has a high viscosity contribution.…”

Section: Thermal Property and Mechanical Property Of The Poly(aa-co-c...mentioning

confidence: 96%

Rapid Synthesis of Robust Antibacterial and Biodegradable Hydrogels via Frontal Polymerization

Wang,

Li,

Shen

et al. 2023

Gels

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Chitosan (CS) is widely used in biomedical hydrogels due to their similarity to extracellular matrix. However, the preparation method of CS-based hydrogel suffers the drawbacks of tedious operation, time-consuming and energy consumption. Thus, there is an urgent need to develop a rapid synthesis pathway towards hydrogels. In this work, we used a modified CS as a cross-linking agent and acrylic acid (AA) as monomer to prepare a hydrogel through frontal polymerization (FP), which facilitates a facile and rapid method achieved in several minutes. The occurrence of pure FP was confirmed via the frontal velocity and temperature profile measurement. In addition, the as-prepared hydrogel shows excellent mechanical strength up to 1.76 MPa, and the Young’s modulus (ranging from 0.16 to 0.56 MPa) is comparable to human skin. The degradation mechanism is revealed by the micro-IR images through the distribution of the functional groups, which is attributed to the breakage of the ether bond. Moreover, the hydrogel exhibits excellent degradability, biocompatibility and antibacterial properties, offering great potentials in tissue engineering. We believe this work not only offers a facile and rapid FP method to fabricate a robust degradable hydrogel, but also provides an effective pathway for the investigation of the degradation mechanism at the chemical bond analysis level.

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Section: Thermal Property and Mechanical Property Of The Poly(aa-co-c...mentioning

confidence: 96%

Rapid Synthesis of Robust Antibacterial and Biodegradable Hydrogels via Frontal Polymerization

Wang,

Li,

Shen

et al. 2023

Gels

View full text Add to dashboard Cite

show abstract

“…In our previous study, 118 the effect of barium ferrites (BFs) on the mechanical properties of PU was discussed. We found that the Tg of PU composites decreased first and then increased with the increase in BF content, which was due to the effect of improved microphase separation 43–47 .…”

Section: Effect Of Filler On Microphase Separation and Mechanical Pro...mentioning

confidence: 99%

Effect of fillers on the microphase separation in polyurethane composites: A review

Jiang,

Gao,

Wang

et al. 2023

Polymer Engineering & Sci

Self Cite

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The microphase separation behavior of polyurethane (PU) strongly affects its mechanical, thermal, electrical, and other functional properties. Adding fillers to change the degree of microphase separation (DPS) in PU is a convenient and efficient method. Although many scholars have tried to regulate the microphase separation of PU by adding fillers, there are still many controversies about the effect. In this review, we classify commonly used fillers into three categories according to their morphology: spherical fillers, fibrous fillers, and layered fillers, and summarize their effects on the microphase separation behavior of PU. We explore the similarities and differences in the mechanisms by which different fillers affect the microphase separation of PU, and find that the polarity, morphology, size of fillers, and preparation method have a significant impact on the degree of microphase separation in PU. The impact of microphase separation on the mechanical properties of PU has also been summarized to illustrate their close relationship. We hope that these summaries will provide some guidance for the development of new high‐strength and multifunctional PU composites.Highlights Summarized recent research progress on effect of common fillers on DPS of PU. Common fillers are classified into three categories based on their morphology. Common laws of the fillers impact on the DPS are classified and discussed. The close relationship between DPS and mechanical properties is reviewed. Provided information for high‐strength and multifunctional PU development.

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Waterborne polyurethane containing fluorosilicone coating: to endow leather with enduring hydrophobicity and mechanical properties

Zhao,

Sui,

Zhang

et al. 2024

Textile Research Journal

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Natural leather-based materials possess a combination of air permeability, wear resistance, and plasticity. However, conventional leather products have inherent limitations that make them unsuitable for unconventional applications. Therefore, it is necessary to develop new capabilities in order to overcome these limitations. In this study, we explored the conversion of regular leather into a high-strength product with hydrophobic properties through surface engineering. To achieve this, we synthesized polysiloxane-modified fluorinated waterborne polyurethane emulsions as functional coatings using emulsion polymerization. The structure and properties of the treated leathers were characterized using techniques such as Fourier transform infrared, thermogravimetry, X-ray photoelectron spectroscopy, X-ray diffraction, and scanning electron microscopy. The results demonstrated that the synthesized polysiloxane-modified fluorinated waterborne polyurethane successfully penetrated and combined with the fibers of the leather, resulting in excellent hydrophobicity. The water contact angle increased to 124.3°. Furthermore, the tensile strength and tear strength of unfinished leather are 875 N and 114 N, respectively. The application of waterborne polyurethane-derived functional additives as coatings resulted in a significant increase in tensile and tear strength of the leather by 60 N and 16 N, respectively. In addition, the softness of the leather increased from 7.6 mm to 10.09 mm. Overall, the use of this functional waterborne polyurethane coating will contribute to the diversification of leather applications.

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Viscoelastic analysis of nano‐barium ferrite reinforced casting polyurethane

Cited by 3 publications

References 48 publications

Rapid Synthesis of Robust Antibacterial and Biodegradable Hydrogels via Frontal Polymerization

Rapid Synthesis of Robust Antibacterial and Biodegradable Hydrogels via Frontal Polymerization

Effect of fillers on the microphase separation in polyurethane composites: A review

Waterborne polyurethane containing fluorosilicone coating: to endow leather with enduring hydrophobicity and mechanical properties

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