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    Wyświetlanie 1-9 z 9
    Tytuł:
    Radiation crosslinking of plastics in the automotive industry
    Autorzy:
    Spišák, Emil
    Dulebová, Ľudmila
    Greškovič, František
    Wydawca:
    Politechnika Lubelska
    Opis:
    The cross-linking is the most important reaction of polymers that significantly changes product properties. In the cross-linking, the molecules are joined to create a functional net. The radiation in cross-linking causes change of the thermoplastic into the thermoset. Increasing density of cross-linking increases rigidity and hardness, electric resistance and resistance to solvents; and decreases the degree of bulking. The cross-linking is carried out by peroxides, silanes, ionizing radiation (for example the radiation dose in PE is within the range 1 – 30 Mrad) and by vulcanization of sulphur (in caoutchouc).
    European Union
    Dostawca treści:
    Repozytorium Centrum Otwartej Nauki
    Artykuł
    Tytuł:
    Lignin-Based Composite Materials for Photocatalysis and Photovoltaics
    Autorzy:
    Khan, Ayesha
    Nair, Vaishakh
    Gläser, Roger
    Colmenares, Juan Carlos
    Wydawca:
    Springer
    Cytata wydawnicza:
    Khan A, Nair V, Colmenares JC, Gläser R. Lignin-Based Composite Materials for Photocatalysis and Photovoltaics. Top Curr Chem (Cham). 2018 May 2;376(3):20. doi: 10.1007/s41061-018-0198-z.
    Opis:
    Depleting conventional fuel reserves has prompted the demand for the exploration of renewable resources. Biomass is a widely available renewable resource that can be valorized to produce fuels, chemicals, and materials. Among all the fractions of biomass, lignin has been underutilized. Due to its complex structure, recalcitrant nature, and heterogeneity, its valorization is relatively challenging. This review focuses on the utilization of lignin for the preparation of composite materials and their application in the field of photocatalysis and photovoltaics. Lignin can be used as a photocatalyst support for its potential application in photodegradation of contaminants. The interaction between the components in hybrid photocatalysts plays a significant role in determining the photocatalytic performance. The application of lignin as a photocatalyst support tends to control the size of the particles and allows uniform distribution of the particles that influence the characteristics of the photocatalyst. Lignin as a semiconductive polymer dopant for photoanodes in photovoltaic cells can improve the photoconversion efficiency of the cell. Recent success in the development of lignosulfonates dopant for hole transport materials in photovoltaics will pave the way for further research in lignin-based high-performance organic electronic devices.
    This publication is part of a project that has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No. 711859 and from the financial resources for science in the years 2017–2021 awarded for the implementation of an international co-financed project. Prof. Dr. J.C. Colmenares and Dr. V. Nair are very grateful for the partial support from the National Science Centre in Poland within Sonata Bis Project No. 2015/18/E/ST5/00306. Roger Gläser gratefully acknowledges support from the Leipzig Graduate School of Natural Sciences: Building with Molecules and Nano-objects as well as from the Research Academy Leipzig.
    Dostawca treści:
    Repozytorium Centrum Otwartej Nauki
    Artykuł
    Tytuł:
    Chitosan with Natural Additives as a Potential Food Packaging
    Autorzy:
    Woźniak, Magdalena
    Stefanowska, Karolina
    Ratajczak, Izabela
    Dobrucka, Renata
    Wydawca:
    MDPI
    Cytata wydawnicza:
    Stefanowska K, Woźniak M, Dobrucka R, Ratajczak I. Chitosan with Natural Additives as a Potential Food Packaging. Materials. 2023; 16(4):1579. https://doi.org/10.3390/ma16041579; https://www.mdpi.com/1996-1944/16/4/1579
    Opis:
    Recently, the development of materials based on natural polymers have been observed. This is the result of increasing environmental degradation, as well as increased awareness and consumer expectations. Many industries, especially the packaging industry, face challenges resulting from legal regulations. Chitin is the most common biopolymer right after cellulose and is used to produce chitosan. Due to the properties of chitosan, such as non-toxicity, biocompatibility, as well as antimicrobial properties, chitosan-based materials are used in many industries. Many studies have been conducted to determine the suitability of chitosan materials as food packaging, and their advantages and limitations have been identified. Thanks to the possibility of modifying the chitosan matrix by using natural additives, it is possible to strengthen the antioxidant and antimicrobial activity of chitosan films, which means that, in the near future, chitosan-based materials will be a more environmentally friendly alternative to the plastic packaging used so far. The article presents literature data on the most commonly used natural additives, such as essential oils, plant extracts, or polysaccharides, and their effects on antimicrobial, antioxidant, mechanical, barrier, and optical properties. The application of chitosan as a natural biopolymer in food packaging extends the shelf life of various food products while simultaneously reducing the use of synthetic plastics, which in turn will have a positive impact on the natural environment. However, further research on chitosan and its combinations with various materials is still needed to extent the application of chitosan in food packaging and bring its application to industrial levels.
    Dostawca treści:
    Repozytorium Centrum Otwartej Nauki
    Artykuł
    Tytuł:
    Comparison of the Bending Resistance Properties of Carbon Fiber/Foam Sandwich Structural Composites with Different Laying Angles
    Autorzy:
    Zhang, Xiaofeng
    Zhu, Lvtao
    Cao, Shengbin
    Shen, Wei
    Zhu, Chengyan
    Wydawca:
    Sciendo
    Cytata wydawnicza:
    Zhu L, Cao S, Zhang X, Shen W, Zhu C. Comparison of the Bending Resistance Properties of Carbon Fiber/Foam Sandwich Structural Composites with Different Laying Angles. Fibres & Textiles in Eastern Europe. Sciendo, 2022;30(2): 75-81. https://doi.org/10.2478/ftee-2022-0010
    Opis:
    This work was supported by the Zhejiang Provincial Natural Science Foundation of China under Grant No. LGG21E050025, the Fundamental Research Funds of Zhejiang Sci-Tech University (Project Number: 20202113- Y), Teacher Professional Development Project of Shanghai Municipal Education Commission 2020 Shanghai Higher Education Teacher Training Plan, the Fundamental Research Funds of Shaoxing Keqiao Research Institute of Zhejiang Sci-Tech University (Project number: KYY2021001G), as well as the Open Project of the State Key Laboratory of Non-ferrous Metal Material Preparation and Processing (No:19AZ02). We also acknowledge the support from the Open Project of Key Laboratory of Silk Engineering of Jiangsu Province (No. KJS2059).
    This research aimed to explore the influence of fiber laying angles on the bending resistance properties of carbon fiber/foam sandwich structural composites. Four kinds of composites with the following laying angles: [0°]8, [0°/45°/90°/−45°]s, [0°/90°]4 and [45°/−45°]4 were prepared and tested in three-point bending experiments. The results obtained showed that the bending resistance performance was the best when the laying angle was [0°]8, while it was the worst when the laying angle was [45°/−45°]4. Besides, it was found that the tensile performance was the best when the fibers were arranged in the 0° direction when the strength utilisation rate was the highest. In addition, by observing the failure morphologies of the composites, the delamination and foam cracking were found in the four groups of composites. In contrast, the phenomenon of significant fracture was found on composites with a laying angle of [45°/−45°]4 only, indicating it had a poor bending resistance performance.
    Dostawca treści:
    Repozytorium Centrum Otwartej Nauki
    Artykuł
    Tytuł:
    The Nd-(Fe,Co)-B Powder Biencapsulation With Cu/epoxy Resin and Its Effect on Pitting Corrosion Resistance of Bonded Magnets
    Autorzy:
    Klimecka-Tatar, Dorota
    Pawłowska, Grażyna
    Wydawca:
    Savaş Kitap ve Yayınevi
    Opis:
    Stanisław Borkowski
    In this chapter the effect of the Nd-(Fe,Co)-B powder particle biencapsulation with Cu layer on bonded magnetic materials corrosion behaviour has been investigated. Bonded magnets were prepared from nanocrystalline magnetic Nd11Fe77Co5B6 powder. Powder particles before consolidation were preliminary etched with oxalic acid and then coated with bilayer (powder biencapsulation). The powder surface was coated as a first with Cu layer during 1 or 5 minutes in copper plating bath and the second layer was thermosetting epoxy-resin. The polarization curves in phosphate environment with addition of chloric ions were determined. It has been established that the used biencapsulation method not always satisfactorily isolate individual particles of the powder and consequently, significantly inhibits corrosion processes of the final material, especially in passivating environment containing Cl-.
    Dostawca treści:
    Repozytorium Centrum Otwartej Nauki
    Artykuł
    Tytuł:
    Mechanical Properties of Textile-Reinforced Composites with a 3D Printed Core
    Autorzy:
    Szary, Jakub
    Świniarski, Jacek
    Barburski, Marcin
    Wydawca:
    Sciendo
    Cytata wydawnicza:
    Szary, J., Barburski, M. & Świniarski, J. Mechanical Properties of Textile-Reinforced Composites with a 3D Printed Core. Fibres & Textiles in Eastern Europe, 2023, Sciendo, vol. 31 no. 4, pp. 38-45. https://doi.org/10.2478/ftee-2023-0034
    Opis:
    The article discusses the mechanical properties of glass fiber epoxy composites with three types of textile structures. Braided, knitted and woven sleeves were placed on a 3D printed flat core and impregnated with resin using the vacuum bag method. The 3-point flexural and tensile tests were performed. The results were compared with those of 3D-printed flat bars and proved that woven textile structures increase the strength and modulus of elasticity, whereas braided and knitted structures only increase the moduli. The advantages, drawbacks and failure modes of each reinforcement structure are also discussed including the drapeability on the spatial core.
    The funders had no role in the study design, data collection and analysis, decision to publish, or manuscript preparation.
    Dostawca treści:
    Repozytorium Centrum Otwartej Nauki
    Artykuł
    Tytuł:
    Fabric Treated with Dye Modified TiO2/Graphene Composite and its Photocatalytic and Self-Cleaning Properties
    Autorzy:
    Bao, Li-hong
    Fanglan, Guan
    Wen, Yu-xin
    Jinmei, Nie
    Ling, Jia-wen
    Mei, Zhang
    Wydawca:
    Sciendo
    Cytata wydawnicza:
    Wen, Yu-xin, et al. "Fabric Treated with Dye Modified TiO2/Graphene Composite and its Photocatalytic and Self-Cleaning Properties" Fibres & Textiles in Eastern Europe, vol. 30, no. 5, Sciendo, 2022, pp. 53-59. https://doi.org/10.2478/ftee-2022-0044
    Opis:
    In this paper, a dye modified titanium dioxide/graphene composite (DTG20) was prepared using direct grey D, a dye with good water solubility, as a modifier. Then the DTG20 and its intermediates, including TiO2 and titanium dioxide/graphene (TG), were finished on cotton fabric through the padding, coating and compounding methods, respectively. Photocatalytic properties of the treated fabrics were investigated using the MB simulated pollutant. It was found that the photodegradation efficiency of MB shown by DTG20 finished fabric treated with the compounding method can reach 90.55 %, and after four recycling experiments, the removal rate of MB can still reach 77.07 %. After being exposed to sunlight for 6 hours, the photodegradation efficiency of MB stained on the surface of DTG20 treated fabric can achieve 91.44 %; therefore, it also exhibited an excellent self-cleaning effect.
    This work was financially supported by the National Natural Science Foundation of China (52173001, 52003010), and the authors would like to thank the Foundation of BIFT for the grant (No. BIFTXZ201808).
    Dostawca treści:
    Repozytorium Centrum Otwartej Nauki
    Artykuł
    Tytuł:
    Experimental Investigation on the Bending Behavior of Weft Interlaced Multilayered Woven Fabrics for Composite Applications
    Autorzy:
    Cherif, Chokri
    Sennewald, Cornelia
    Vorhof, Michael
    Pilgrim, Jasmin
    Weise, Daniel
    Schegner, Philipp
    Hoffmann, Gerald
    Wydawca:
    Sciendo
    Cytata wydawnicza:
    Schegner, P., Vorhof, M., Weise, D., Sennewald, C., Pilgrim, J., Hoffmann, G. & Cherif, C. Experimental Investigation on the Bending Behavior of Weft Interlaced Multilayered Woven Fabrics for Composite Applications. Fibres & Textiles in Eastern Europe, 2023, Sciendo, vol. 31 no. 5, pp. 24-33. https://doi.org/10.2478/ftee-2023-0042
    Opis:
    Direct preforming processes have potential for fiber-reinforced semi-finished products, creating 3D structures with strong delamination resistance using double-flat-steel-healds. However, the shedding method limits pattern variety, necessitating alternative options for interlacing diversity. One approach is using weft yarn instead of warp yarn for interlacing. This study explores its impact on mechanical properties, focusing on bending behavior, fiber volume content, and micrograph analysis of infiltrated warp and weft interlaced structures. The result shows interesting differences in mechanical behavior regarding different weave types and test direction as well as communalities within the individual structures.
    This research and the APC were funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) Grant Number 280656304, CH174/42/2. The IGF research projects 21333 BR of the Forschungsvereinigung Forschungskuratorium Textil e. V. are funded through the AiF within the program for supporting the „Industriellen Gemeinschaftsforschung (IGF)“ from funds of the Federal Ministry for Economic Affairs and Climate Action (BMWk) by a resolution of the German Bundestag.
    Dostawca treści:
    Repozytorium Centrum Otwartej Nauki
    Artykuł
    Tytuł:
    On sets W \subseteq \mathbb{N} such that the infinity of W is equivalent to the existence in W of an element that is greater than a threshold number computed with using the definition of W
    Autorzy:
    Tyszka, Apoloniusz
    Opis:
    Let f(1)=2, f(2)=4, and let f(n+1)=f(n)! for every integer n \geq 2. For a positive integer n, let \Theta_n denote the statement: if a system S \subseteq {x_i!=x_k: i,k \in {1,...,n}} \cup {x_i \cdot x_j=x_k: i,j,k \in {1,...,n}} has only finitely many solutions in integers x_1,...,x_n greater than 1, then each such solution (x_1,...,x_n) satisfies min(x_1,...,x_n) \leq f(n). The statement \Theta_9 proves that if there exists an integer x>f(9) such that x^2+1 (alternatively, x!+1) is prime, then there are infinitely many primes of the form n^2+1 (respectively, n!+1). The statement \Theta_{16} proves that if there exists a twin prime greater than f(16)+3, then there are infinitely many twin primes. We formulate the statements \Phi_n and prove: \Phi_4 equivalently expresses that there are infinitely many primes of the form n!+1, \Phi_6 implies that for infinitely many primes p the number p!+1 is prime, \Phi_6 implies that there are infinitely many primes of the form n!-1, \Phi_7 implies that there are infinitely many twin primes.
    Dostawca treści:
    Repozytorium Centrum Otwartej Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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