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  1. Article: 3D printing of polypropylene reinforced with hemp fibers: Mechanical, water absorption and morphological properties.

    Sultan, Raffay / Skrifvars, Mikael / Khalili, Pooria

    Heliyon

    2024  Volume 10, Issue 4, Page(s) e26617

    Abstract: The aim of this study was to develop and additively manufacture polypropylene-hemp fiber (PPHF) composites, which were composed of polypropylene (PP) and hemp fibers (HF) in various percentages (5%, 10%, and 20%). The objective was to examine the ... ...

    Abstract The aim of this study was to develop and additively manufacture polypropylene-hemp fiber (PPHF) composites, which were composed of polypropylene (PP) and hemp fibers (HF) in various percentages (5%, 10%, and 20%). The objective was to examine the mechanical properties and water absorption behaviors of extruded PP, conventional filament PP and PPHF composites. The findings of the flexural and tensile tests provided important valuable information. In comparison to the other materials examined, extruded PP had the highest flexural modulus and strength, but filament PP had the lowest mechanical properties. The results showed that the 5% hemp PP composite exhibited the highest tensile strength, and the 20% hemp PP composite showed the highest Young's modulus. These results highlight how crucial hemp fiber content is in modifying the mechanical characteristics of a polymeric material to obtain the material with desirable properties for specific industry requirements.
    Language English
    Publishing date 2024-02-17
    Publishing country England
    Document type Journal Article
    ZDB-ID 2835763-2
    ISSN 2405-8440
    ISSN 2405-8440
    DOI 10.1016/j.heliyon.2024.e26617
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Sustainable Flame-Retardant Flax Fabrics by Engineered Layer-by-Layer Surface Functionalization with Phytic Acid and Polyethylenimine.

    Ehsanimehr, S / Sonnier, R / Badawi, M / Ducos, F / Kadi, N / Skrifvars, M / Saeb, M R / Vahabi, H

    Fire technology

    2023  , Page(s) 1–19

    Abstract: New generation of mission-oriented fabrics meets advanced requirements; such as electrical conductivity, flame retardancy, and anti-bacterial properties. However, sustainability concerns still are on-demand in fabrication of multi-functional fabrics. In ... ...

    Abstract New generation of mission-oriented fabrics meets advanced requirements; such as electrical conductivity, flame retardancy, and anti-bacterial properties. However, sustainability concerns still are on-demand in fabrication of multi-functional fabrics. In this work, we used a bio-based phosphorus molecule (phytic acid, PA) to reinforce flax fabrics against flame via layer-by-layer consecutive surface modification. First, the flax fabric was treated with PA. Then, polyethylenimine (PEI) was localized above it to create negative charges, and finally PA was deposited as top-layer. Fourier-transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), scanning electron microscopy (SEM), energy dispersive X-ray spectrometry (EDX), and inductively-coupled plasma atomic emission spectrometry (ICP-AES) proved successful chemical treatment. Pyrolysis-combustion flow calorimetry (PCFC) showed significant drop by about 77% in the peak of heat release rate (pHRR) from 215 W/g for untreated to 50 W/g for treated flax fabric. Likewise, the total heat release (THR) decreased by more than three times from 11 to 3.2 kJ/g. Mechanical behavior of the treated flax fabric was completely different from untreated flax fabrics, changing from almost highly-strengthened behavior with short elongation at break to a rubber-like behavior with significantly higher elongation at break. Surface friction resistance was also improved, such that the abrasion resistance of the modified fabrics increased up to 30,000 rub cycles without rupture.
    Supplementary information: The online version contains supplementary material available at 10.1007/s10694-023-01387-7.
    Language English
    Publishing date 2023-03-28
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2037915-8
    ISSN 1572-8099 ; 0015-2684
    ISSN (online) 1572-8099
    ISSN 0015-2684
    DOI 10.1007/s10694-023-01387-7
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: All-Cellulose Composites: A Review of Recent Studies on Structure, Properties and Applications.

    Baghaei, Behnaz / Skrifvars, Mikael

    Molecules (Basel, Switzerland)

    2020  Volume 25, Issue 12

    Abstract: Nowadays, there is greater demand for greener materials in societies due to environmental consciousness, depleting fossil fuels and growing ecological concerns. Within the foreseeable future, industries and suppliers will be required to be more aware of ... ...

    Abstract Nowadays, there is greater demand for greener materials in societies due to environmental consciousness, depleting fossil fuels and growing ecological concerns. Within the foreseeable future, industries and suppliers will be required to be more aware of challenges faced due to the availability of resources and use more sustainable and renewable raw materials. In this context, cellulose can be expected to become a vital resource for materials owing to its abundance, versatility as a biopolymer, several different forms and potential applications. Thus, all-cellulose composites (ACCs) have gained significant research interest in recent years. ACC is a class of biocomposites in which the matrix is a dissolved and regenerated cellulose, while the reinforcement is undissolved or partly dissolved cellulose. This review paper is intended to provide a brief outline of works that cover recent progress in the manufacturing and processing techniques for ACCs, various cellulose sources, solvents and antisolvents, as well as their properties.
    MeSH term(s) Biocompatible Materials/chemistry ; Cellulose/chemistry ; Green Chemistry Technology
    Chemical Substances Biocompatible Materials ; Cellulose (9004-34-6)
    Language English
    Publishing date 2020-06-19
    Publishing country Switzerland
    Document type Journal Article ; Review
    ZDB-ID 1413402-0
    ISSN 1420-3049 ; 1431-5165 ; 1420-3049
    ISSN (online) 1420-3049
    ISSN 1431-5165 ; 1420-3049
    DOI 10.3390/molecules25122836
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    Zs.MO 81: Show issues

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  4. Article: Epidemiology, Outcomes, and Costs of Pediatric Traumatic Brain Injury Treated in the ICU

    Mikkonen, E. / Raj, R. / Skrifvars, M. B.

    Annual update in intensive care and emergency medicine

    2023  Volume -, Issue -, Page(s) 453

    Language English
    Document type Article
    ZDB-ID 2600427-6
    ISSN 2191-5709
    Database Current Contents Medicine

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  5. Article: Epidemiology, Outcomes, and Costs of Pediatric Traumatic Brain Injury Treated in the ICU

    Mikkonen, E. / Raj, R. / Skrifvars, M. B.

    Annual update in intensive care and emergency medicine

    2023  Volume -, Issue -, Page(s) 453

    Language English
    Document type Article
    ZDB-ID 2600427-6
    ISSN 2191-5709
    Database Current Contents Medicine

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    In stock of ZB MED Cologne/Königswinter

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  6. Article ; Online: Fabrication: Mechanical Testing and Structural Simulation of Regenerated Cellulose Fabric Elium

    Khalili, Pooria / Skrifvars, Mikael / Ertürk, Ahmet Semih

    Polymers

    2021  Volume 13, Issue 17

    Abstract: Regenerated cellulose fibres are an important part of the forest industry, and they can be used in the form of fabrics as reinforcement materials. Similar to the natural fibres (NFs), such as flax, hemp and jute, that are widely used in the automotive ... ...

    Abstract Regenerated cellulose fibres are an important part of the forest industry, and they can be used in the form of fabrics as reinforcement materials. Similar to the natural fibres (NFs), such as flax, hemp and jute, that are widely used in the automotive industry, these fibres possess good potential to be used for semi-structural applications. In this work, the mechanical properties of regenerated cellulose fabric-reinforced poly methyl methacrylate (PMMA) (Elium
    Language English
    Publishing date 2021-08-31
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2527146-5
    ISSN 2073-4360 ; 2073-4360
    ISSN (online) 2073-4360
    ISSN 2073-4360
    DOI 10.3390/polym13172969
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Mechanical and Thermal Properties of Wood-Fiber-Based All-Cellulose Composites and Cellulose-Polypropylene Biocomposites.

    Uusi-Tarkka, Eija-Katriina / Skrifvars, Mikael / Khalili, Pooria / Heräjärvi, Henrik / Kadi, Nawar / Haapala, Antti

    Polymers

    2023  Volume 15, Issue 3

    Abstract: This article explores wood-fiber-based fabrics containing Lyocell yarn in the warp and Spinnova-Lyocell (60%/40%) yarn in the weft, which are used to form unidirectional all-cellulose composites (ACC) through partial dilution in a NaOH-urea solution. The ...

    Abstract This article explores wood-fiber-based fabrics containing Lyocell yarn in the warp and Spinnova-Lyocell (60%/40%) yarn in the weft, which are used to form unidirectional all-cellulose composites (ACC) through partial dilution in a NaOH-urea solution. The aim is to investigate the role of the yarn orientation in composites, which was conducted by measuring the tensile properties in both the 0° and 90° directions. As a reference, thermoplastic biocomposites were prepared from the same fabrics, with biobased polypropylene (PP) as the matrix. We also compared the mechanical and thermal properties of the ACC and PP biocomposites. The following experiments were carried out: tensile test, TGA, DSC, DMA, water absorption test and SEM. The study found no significant difference in tensile strength regarding the Spinnova-Lyocell orientation between ACC and PP biocomposites, while the composite tensile strength was clearly higher in the warp (Lyocell) direction for both composite variants. Elongation at break doubled in ACC in the Lyocell direction compared with the other samples. Thermal analysis showed that mass reduction started at a lower temperature for ACC, but the thermal stability was higher compared with the PP biocomposites. Maximum thermal degradation temperature was measured as being 352 °C for ACC and 466 °C for neat PP, and the PP biocomposites had two peaks in the same temperature range (340-474 °C) as ACC and neat PP combined. ACCs absorbed 93% of their own dry weight in water in just one hour, whereas the PP biocomposites BC2 and BC4 absorbed only 10% and 6%, respectively. The study highlights the different properties of ACC and PP reference biocomposites that could lead to further development and research of commercial applications for ACC.
    Language English
    Publishing date 2023-01-17
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2527146-5
    ISSN 2073-4360 ; 2073-4360
    ISSN (online) 2073-4360
    ISSN 2073-4360
    DOI 10.3390/polym15030475
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Mechanical Properties of Bio-Based Sandwich Composites Containing Recycled Polymer Textiles.

    Khalili, Pooria / Skrifvars, Mikael / Dhakal, Hom Nath / Dashatan, Saeid Hosseinpour / Danielsson, Mikael / Gràcia, Alèxia Feiner

    Polymers

    2023  Volume 15, Issue 18

    Abstract: In this paper, sandwich composites were produced by compression moulding techniques, and they consisted of regenerated cellulose fabric (rayon) and bio-based polypropylene (PP) to form facings, while virgin and recycled polyamide (PA) textiles were used ... ...

    Abstract In this paper, sandwich composites were produced by compression moulding techniques, and they consisted of regenerated cellulose fabric (rayon) and bio-based polypropylene (PP) to form facings, while virgin and recycled polyamide (PA) textiles were used as core materials. To compare the mechanical performance between sandwich composites and typical composite designs, a control composite was produced to deliver the same weight and fiber mass fraction from rayon and PP. To evaluate the influence of recycled textile on the mechanical properties of the composites, a series of flexural, low velocity impact (LVI) and tensile tests were performed. It was found that the incorporation of thicker PA textile enhanced the bending stiffness by two times and the peak flexural force by 70% as compared to those of control. Substitution of a layer of recycled textile for two layers of rayon provided a good level of impact energy absorption capacity (~28 J) and maximum force (~4893-5229 N). The tensile strength of the four sandwich composites was reported to be in the range of 34.20 MPa and 46.80 MPa. This value was 91.90 for the control composite. The 2D cross-section slices of the composite specimens did not show any evidence of fiber tow debonding, fiber bundle splitting, or delamination.
    Language English
    Publishing date 2023-09-19
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2527146-5
    ISSN 2073-4360 ; 2073-4360
    ISSN (online) 2073-4360
    ISSN 2073-4360
    DOI 10.3390/polym15183815
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Enhancing Sustainability: Jute Fiber-Reinforced Bio-Based Sandwich Composites for Use in Battery Boxes.

    Arya, Mina / Malmek, Else-Marie / Ecoist, Thomas Koch / Pettersson, Jocke / Skrifvars, Mikael / Khalili, Pooria

    Polymers

    2023  Volume 15, Issue 18

    Abstract: The rising industrial demand for environmentally friendly and sustainable materials has shifted the attention from synthetic to natural fibers. Natural fibers provide advantages like affordability, lightweight nature, and renewability. Jute fibers' ... ...

    Abstract The rising industrial demand for environmentally friendly and sustainable materials has shifted the attention from synthetic to natural fibers. Natural fibers provide advantages like affordability, lightweight nature, and renewability. Jute fibers' substantial production potential and cost-efficiency have propelled current research in this field. In this study, the mechanical behavior (tensile, flexural, and interlaminar shear properties) of plasma-treated jute composite laminates and the flexural behavior of jute fabric-reinforced sandwich composites were investigated. Non-woven mat fiber (MFC), jute fiber (JFC), dried jute fiber (DJFC), and plasma-treated jute fiber (TJFC) composite laminates, as well as sandwich composites consisting of jute fabric bio-based unsaturated polyester (UPE) composite as facing material and polyethylene terephthalate (PET70 and PET100) and polyvinyl chloride (PVC) as core materials were fabricated to compare their functional properties. Plasma treatment of jute composite laminate had a positive effect on some of the mechanical properties, which led to an improvement in Young's modulus (7.17 GPa) and tensile strength (53.61 MPa) of 14% and 8.5%, respectively, as well as, in flexural strength (93.71 MPa) and flexural modulus (5.20 GPa) of 24% and 35%, respectively, compared to those of JFC. In addition, the results demonstrated that the flexural properties of jute sandwich composites can be significantly enhanced by incorporating PET100 foams as core materials.
    Language English
    Publishing date 2023-09-21
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2527146-5
    ISSN 2073-4360 ; 2073-4360
    ISSN (online) 2073-4360
    ISSN 2073-4360
    DOI 10.3390/polym15183842
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article: Brain Injury Biomarkers for Predicting Outcome After Cardiac Arrest

    Humaloja, J. / Ashton, N. J. / Skrifvars, M. B.

    Annual update in intensive care and emergency medicine

    2022  Volume -, Issue -, Page(s) 285

    Language English
    Document type Article
    ZDB-ID 2600427-6
    ISSN 2191-5709
    Database Current Contents Medicine

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    In stock of ZB MED Cologne/Königswinter

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