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EN
This study examines the potential use of betulin as an alternative to silver in enhancing vinyl-coated fabrics. Silver, commonly used to impart antimicrobial properties to polymers, raises environmental and cytotoxicity concerns. Betulin, known for its antibacterial, anti-inflammatory, antiviral, and antifungal characteristics, emerges as an eco-friendly alternative. The study highlights the possible applications of betulin in various sectors, such as medical, military, and public settings, where addressing the challenge of harmful biofilms is critical. The aim of this research was to assess the possible effectiveness of betulin as a modifier in polyvinyl chloride (PVC) coated textiles. The study involved extracting betulin, preparing plasticizer-based betulin premix, incorporating it into plastisol, and then coating fabrics to analyze its effect on surface bioactivity. Preliminary tribological studies were conducted to assess the durability of the coating. According to the ISO 22196:2007 standard, significant antibacterial effects were observed, with an activity rating (R) ranging between 1.55 and 2.0. In addition, tribological studies indicated an improvement in coating durability compared to conventional PVC coatings. The results suggest that betulin shows potential as a cost-efficient and environmentally friendly alternative, contributing to improved product functionality while minimizing environmental impact. Further research is planned to investigate the potential of betulin in polymer modification and to exploit its positive impact on human health and environmental sustainability.
PL
Dokonano oceny metody doboru najkorzystniejszej struktury wewnętrznej dla elementów pracujących w warunkach przenoszenia naprężeń. Przedstawiono czynności związane z zaprojektowaniem modeli do druku 3D, a także opisano ich zachowanie podczas badań wytrzymałościowych.
EN
Six geometric models with different internal structures were designed by using a computer-aided procedure (shape program) and 3-dimensionally printed by incremental technol. A polyol-modified and SiO2 nanoparticles-filled polycarbonate was used as the filament. The model with the large hexagon structure showed the highest compressive strength and with the circular structure showed the lowest one. A large discrepancy between the simulated and actual values of compressive strength was obsd.
4
Content available Organic bacteriostatic material
EN
The use of antibiotics to treat bacterial infections is becoming less and less effective year by year due to the increasing resistance of bacteria. The microbial evolutionarily acquired resistance to antibiotics increases the threat to man’s life due to difficulties regarding effective therapies to fight infections. Therefore, apart from treatment, it is necessary to introduce appropriate prophylaxis which limits the multiplication of bacterial colonies on everyday use objects. Due to the antibiotic resistance phenomenon, it is important to find a new material with antibacterial properties for FDM 3D printing in medical applications. The work contains research on a new chemical compound used as an additive to thermoplastics. The rhodamine derivative was synthesized via the 4-diphenylaminobenzaldehyde reaction with 1.3-indendione in a boiling mixture of EtOH/H2SO4. The obtained chemical compound was used as a bacteriostatic modifier of the polycarbonate (PC) properties, as such a modification enables application e.g. for medical device housings or for surfaces frequently touched by people. The modifier and the commercially available polymer were compounded with a high-temperature screw extruder and a filament for FDM 3D printer was created. The modified polymer revealed antibacterial properties relative to Escherichia coli and good thermal stability during the processing.
5
Content available remote Porowate materiały poliuretanowe do zastosowań w diagnostyce medycznej
PL
Opracowano proces wytwarzania pianek węglowych (synteza, karbonizacja), a także dokonano ich szerokiej charakterystyki, wykorzystując mikroskopię świetlną, skaningową mikroskopię elektronową SEM, mikrotomografię komputerową μCT, spektroskopię w podczerwieni FT-IR i chromatografię gazową sprzężoną z detektorem mas GC-MS. Wyniki przeprowadzonych badań umożliwiły wyselekcjonowanie pianek o najlepszych właściwościach sorpcyjnych, które mogą znaleźć zastosowanie w diagnostycznych badaniach fazy oddechowej.
EN
Polyurethane (PUR) foams were synthetized from polyols and methylene diphenyl diisocyanate polymers at mass ratios 1:1, 1:3 and 3:1 without any catalyst or in its presence. The porous structure of the PUR foams was detd. by using scanning electron microscopy and high-resolution 3D computed tomog. The PUR foams showed a good sorbability and could be used in the human diagnostic (respiratory phase).
PL
Opisano czynności związane z doborem materiałów polimerowych oraz procesem wytwarzania prototypów wózków w systemach drzwi przesuwnych, a także dokonano ich charakterystyki, posługując się metodami projektowania bazującymi na metodzie elementów skończonych. Wyniki przeprowadzonych badań posłużyły do wyselekcjonowania materiałów o najlepszych właściwościach wytrzymałościowych w zastosowaniach związanych z obciążeniem dynamicznym, które mogą być wykorzystane w profesjonalnych systemach przesuwnych, zarówno przemysłowych, jak i do użytku prywatnego.
EN
High d. polyethylene and polycarbonate (PC) were used as materials for designing carts used in sliding door system. The computer-aided design based on the finite element method was used to det. both stresses in the designed subassembly as well as its optimal shape and mass then its computer-aided manufg. The tested cart made of PC had twice as large the allowable stresses.
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