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  • 1
    Online Resource
    Online Resource
    A ternary biocomposite based on modified fish scale collagen and ginsenoside Rb1: preparation, properties and bioactivities
    Wiley ; 2022
    In:  Polymer International Vol. 71, No. 8 ( 2022-08), p. 1039-1050
    Details
    In: Polymer International, Wiley, Vol. 71, No. 8 ( 2022-08), p. 1039-1050
    Abstract: This paper presents some characteristics, morphologies and bioactivities of modified collagen films (MCF) in a combination of fish scale collagen gel, crosslinking agent and ginsenoside Rb1. Collagen was extracted from freshwater fish scales by biochemical methods using pepsin enzyme to improve collagen hydrolysis. Glutaraldehyde, glucose and riboflavin were chosen as modification agents for the obtained collagen. These collagen samples were processed into MCF by a 3D printing method. The characteristics and morphologies of MCF were evaluated using infrared, energy‐dispersive X‐ray, field emission scanning electron microscopy and high‐performance liquid chromatography techniques. Moreover, the biocompatibility, hemostatic ability and anti‐inflammatory and antimicrobial activities of MCF were tested for preliminarily assessing the application efficiency of MCF. The obtained results suggest that crosslinking agent and ginsenoside Rb1 have effects on properties of collagen. MCF are well biocompatible, have great anti‐inflammatory and antimicrobial ability, are nontoxic to normal cells and have short blood clotting time. They are promising for applications of 3D printed modified collagen/ginsenoside Rb1 biocomposite films in biomedicine as hemostatic agents or other biomedical materials. © 2022 Society of Industrial Chemistry.
    Type of Medium: Online Resource
    ISSN: 0959-8103 , 1097-0126
    URL: Issue
    URL: Article
    DOI: 10.1002/pi.v71.8
    DOI: 10.1002/pi.6389
    Language: English
    Publisher: Wiley
    Publication Date: 2022
    detail.hit.zdb_id: 2004753-8
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  • 2
    Online Resource
    Online Resource
    Mechanical properties and weather stability of a novel nanocomposite coating based on fluoroethylene/vinyl ether copolymer and organically modified zirconium dioxide nanoparticles
    Wiley ; 2023
    In:  Polymer Engineering & Science Vol. 63, No. 9 ( 2023-09), p. 3135-3147
    Details
    In: Polymer Engineering & Science, Wiley, Vol. 63, No. 9 ( 2023-09), p. 3135-3147
    Abstract: This study aims to investigate the effect of organically modified zirconium dioxide nanoparticles (m‐ZrO 2 NPs) on the mechanical properties, morphology, and weather stability of fluoroethylene/vinyl ether copolymer (FEVE). To modify the surface of ZrO 2 NPs, a 3‐(trimethoxysilyl)propyl methacrylate silane (TMSPM) organic coupling agent was utilized. The ZrO 2 NPs were treated with 3 wt.% of TMSPM using a solution method with ultrasonication assistance at 50°C. Various amounts of m‐ZrO 2 NPs (1, 2, and 4 wt.% of FEVE weight) were dispersed in a xylene solvent and mixed with FEVE resin. The mixture was then cured with polyisocyanate. The mechanical properties of the FEVE nanocomposite coatings, including impact resistance, adhesion, and abrasion resistance were measured. The morphology of the coatings was analyzed using scanning electron microscopy (SEM). To evaluate the weather stability of the coatings, an accelerated weathering test was conducted in a QUV/SPRAY chamber. This test could potentially affect the chemical structure, weight/thickness, and surface characteristics of the coatings. The carbonyl index, weight loss, and changes in mechanical properties of the coatings were monitored and discussed at different intervals during the accelerated weathering test. In addition, the morphology of the coatings after undergoing 42 cycles of accelerated weathering testing was analyzed. The results indicated that m‐ZrO 2 NPs had a positive impact on the weather durability of FEVE resin, particularly in significantly enhancing the weather resistance of the FEVE‐based coatings. Therefore, these coatings exhibit potential for outdoor applications. Highlights Silane modified ZrO 2 nanoparticles improve the mechanical properties of FEVE resin. The weather stability of FEVE resin increases as using modified ZrO 2 nanoparticles. The suitable content of modified ZrO 2 nanoparticles for FEVE resin is 2 wt.%. Mechanical properties of the nanocomposite reduce slightly after 42 cycle testing. Propose the mechanism for weather resistance of the nanocomposite coating.
    Type of Medium: Online Resource
    ISSN: 0032-3888 , 1548-2634
    URL: Issue
    URL: Article
    DOI: 10.1002/pen.v63.9
    DOI: 10.1002/pen.26433
    Language: English
    Publisher: Wiley
    Publication Date: 2023
    detail.hit.zdb_id: 2006718-5
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  • 3
    Online Resource
    Online Resource
    Effect of organically modified titania and zirconia nanoparticles on characteristics, properties of coating based on acrylic emulsion polymer for outdoor applications
    Wiley ; 2023
    In:  Journal of Applied Polymer Science Vol. 140, No. 16 ( 2023-04-20)
    Details
    In: Journal of Applied Polymer Science, Wiley, Vol. 140, No. 16 ( 2023-04-20)
    Abstract: Effect of titania nanoparticles modified with 3 wt% [3‐(methacrylloxy)propyl]trimethoxysilane (m‐TiO 2 NPs) and zirconia nanoparticles modified with 3 wt% (3‐glycidyloxypropyl)triethoxysilane (m‐ZrO 2 NPs) on properties and morphology of acrylic emulsion polymer coating was investigated. With suitable weight ratio of m‐TiO 2 /m‐ZrO 2 NPs, the acrylic coating could be improved abrasion resistance, weather durability, reflectance index (400–1400 nm) as well as thermal‐oxidation stability in comparison with the coatings having the same content of single modified nanoparticles. The starting thermal degradation temperature of acrylic coating filled by mixture of m‐TiO 2 NPs and m‐ZrO 2 NPs was approximately 10°C higher than that of the acrylic coating contained separately modified nanoparticles. The mixture of m‐TiO 2 NPs and m‐ZrO 2 NPs were used in solar reflective paint. Replacement of rutile TiO 2 microparticles by 1 wt% mixture of modified nanoparticles, the solar reflective paint (SRP) could be improved water resistance and cooling performance. The water permeability of the SRP coating with mixture of modified nanoparticles was reduced by nearly 50%. The results of cooling performance test indicated that SRP loaded 1 wt% (m‐TiO 2 NPs and m‐ZrO 2 NPs) (weight ratio of 1/1) replaced 1 wt% TiO 2 microparticles could reduce outside temperature of chamber test by nearly 11°C and ambient inside temperature of chamber test by 7.5°C. This novel solar reflective paint is considered as promising material for outdoor applications.
    Type of Medium: Online Resource
    ISSN: 0021-8995 , 1097-4628
    URL: Issue
    URL: Article
    DOI: 10.1002/app.v140.16
    DOI: 10.1002/app.53752
    Language: English
    Publisher: Wiley
    Publication Date: 2023
    detail.hit.zdb_id: 1491105-X
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  • 4
    Online Resource
    Online Resource
    Enhancement of dynamic mechanical properties and flame resistance of nanocomposites based on epoxy and nanosilica modified with KR‐12 coupling agent
    Wiley ; 2021
    In:  Journal of Applied Polymer Science Vol. 138, No. 29 ( 2021-08-05)
    Details
    In: Journal of Applied Polymer Science, Wiley, Vol. 138, No. 29 ( 2021-08-05)
    Abstract: The epoxy/silica nanocomposites containing a wide range of isopropyltri[di(octyl) phosphate] titanate coupling agent (KR‐12) modified nanosilica (m‐nanosilica) loading (0–7 wt%) cured with tetrabutyl titanate hardener were prepared. Their morphology, thermal stability, thermal expansion, and mechanical properties including hardness, abrasion resistance were investigated. The wetting ability of epoxy‐nanosilica systems on glass surface was assessed based on static contact angle. The obtained results showed that the contact angle of the nanocomposites containing m‐nanosilica is slightly changed as compared to the contact angle of pure epoxy resin and lower than that of the nanocomposite containing unmodified nanosilica. The data of dynamic mechanical analysis of the nanocomposites using different nanosilica content indicated that the presence of m‐nanosilica lowered the recovery energy of the nanocomposites to 41.62% as compared to neat epoxy. The limiting oxygen index (LOI) of the nanocomposites confirmed that the m‐nanosilica increased the flame retardance of epoxy matrix. When using 7 wt% of m‐nanosilca, the LOI value of the nanocomposite was 27.4 while this index of neat epoxy was 21.6. The scanning electron microscopic images of residual char combustion of the nanocompsites indicated a formation of nanosilica layer contributed to restrain combustion of the material.
    Type of Medium: Online Resource
    ISSN: 0021-8995 , 1097-4628
    URL: Issue
    URL: Article
    DOI: 10.1002/app.v138.29
    DOI: 10.1002/app.50685
    Language: English
    Publisher: Wiley
    Publication Date: 2021
    detail.hit.zdb_id: 1491105-X
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