Włókna o wielu zastosowaniach

Stawski, Dawid : Instytut Materiałoznawstwa Tekstyliów i Kompozytów Polimerowych - Wydział Technologii Materiałowych i Wzornictwa Tekstyliów - Politechnika ŁódzkaArtykuł zamieszczony jest w : Życie Uczelni : biuletyn informacyjny Politechniki Łódzkiej nr 151, marzec 2020Na Wydziale Technologii Materiałowych i Wzornictwa Tekstyliów PŁ odbyła się dziesiąta konferencja naukowa Central European Conference Fibre Grade Polymers, Chemical Fibres and Special Textiles. Tematyka koncentrowała się na otrzymywaniu i właściwościach polimerów włóknotwórczych, metodach syntezy włókien chemicznych oraz wykorzystywaniu tych materiałów do otrzymywania wyrobów włókienniczych o specjalnych zastosowaniach.[...

Andrzej Dems (1938-1988)

Artykuł zamieszczony jest w : Życie Uczelni : biuletyn informacyjny Politechniki Łódzkiej nr 151, marzec 2020W trzydziestą rocznicę śmierci Andrzeja Demsa wspominali Go uczestnicy konferencji Central European Conference Fibre Grade Polymers, Chemical Fibres and Special Textiles związanej z tematyką badawczą, nad którą pracował

Antioxidant and hydrophilic poly(lactic acid) fibers obtained through their modification with amines and ferulic acid

The ferulic acid (FA) is a natural antioxidant, abundantly present in plants, which acts as the plant's immune system. In order to take advantage of its properties, a method has been developed, which combines antioxidant FA with bio-based biodegradable poly(lactic acid) fibers and biocompatible hydrophilic polyallylamine, enabling the production of versatile base material that could be used for active anti-inflammatory wound dressings. The fibers are first subjected to aminolysis in order to obtain amino moieties on the surface, able to react with the molecules of FA. Next, the FA was attached to the aminolyzed fibers surface with use of 1-ethyl-3–(3-dimethylaminopropyl) carbodiimide and N-hydroxysuccinimide. The anti-inflammatory properties of the modified fibers were assessed using 2,2-diphenyl-1-picrylhydrazyl radical scavenging assay. Presence of FA on the fibers’ surface was investigated through X-ray photoelectron spectroscopy analysis and Folin–Ciocalteu (total phenolic content) test

Antibacterial properties of poly (N,N-dimethylaminoethyl methacrylate) obtained at different initiator concentrations in solution polymerization

Funding Information: The manuscript was financed from funds assigned for 14-148-1-21-28 statuary activity, by the Lodz University of Technology, Institute of Material Technologies of Textiles and Polymer Composites, Poland. Publisher Copyright: © 2022 The Authors.The samples of poly(N,N-dimethylaminoethyl methacrylate) were synthesized by radical polymerization. The amount of monomer and solvent was constant as opposed to an amount of initiator which was changing. No clear relationship between polymerization conditions and the molecular weight of the polymer was found, probably due to the branched configuration of produced polymer. Bactericidal interactions in all samples against Gram-positive and Gram-negative bacteria have been demonstrated. However, the observed effect has various intensities, depending on the type of bacteria and the type of sample.Peer reviewe

The private sphere of life of the factory-owners in Łódź in the second part of the 19th century

Praca przedstawia stronę prywatną życia łódzkich przemysłowców w drugiej połowie XIX wieku. W pierwszej części zostały opisane warunki mieszkaniowe, sposoby spędzania wolnego czasu, zainteresowania. Natomiast druga część poświęcona została porównaniu łódzkiej burżuazji z warszawską.Author examines the private sphere of life of the factory owners in Łódź in the second part of the 19th century. In the first part the following subjects are described: housing, free time, hobbys. In the second part the burgeoisie of Łódź is compared with the burgeoisie from Warszawa

Thermal properties of poly(N,N-dimethylaminoethyl methacrylate).

Poly(N,N-dimethylaminoethyl methacrylate) (PDMAEMA) is a promising quite new polymer with very interesting properties. The thermal degradation process of PDMAEMA was investigated. The polymer was heated at specific time intervals, then heating was stopped, and infrared analysis was performed to obtain information on the structure of the solid residue. The thermal degradation process has a two-stage character. The limit temperature for the first decomposition step was about 390°C, after which the second stage of sample decomposition began. The order of disintegration of the macromolecules was determined. Activation energy values for the thermal decomposition process have been calculated; they are 89.8 kJ/mol for the first stage and 17.7 kJ/mol for the second stage of the degradation process

Thermal and Mechanical Characteristics of Okra (Abelmoschus esculentus) Fibers Obtained via Water- and Dew-Retting

In this research, fibers were extracted from different parts of the okra plant (Abelmoschus esculentus) via water- and dew-retting methods. The fibers were subjected to physical and thermal analyses. The fibers obtained from the upper part of the okra plant showed higher breaking strength and lower linear density. Fibers obtained via water-retting exhibited higher breaking strength, higher elongation at break rates, and lower linear density values. The paper also presents the results of thermogravimetric analysis of the okra fibers. Tests were carried out in oxygen and inert gas atmospheres. Slight differences were found in the thermal resistance of the tested fibers, which was confirmed by an analysis using the αs-αr methodology. The calculated activation energy showed a widespread range of values

The Effect of Molecular Weight on the Antibacterial Activity of <i>N</i>,<i>N</i>,<i>N</i>-Trimethyl Chitosan (TMC)

N,N,N-trimethyl chitosan (TMC) with 93% degree of trimethylation was synthesized. TMC and the chitosan starting material were subjected to acidic hydrolysis to produce 49 different samples with a reduced average molecular weight (Mw) ranging from 2 to 144 kDa. This was done to allow the investigation of the relationship between antibacterial activity and Mw over a wide Mw range. NMR investigation showed that hydrolysis did not affect the degree of trimethylation (DSTRI) or the structure of the polymer backbone. The activity of TMC against Staphylococcus aureus (S. aureus) increased sharply with Mw until a certain Mw value (critical Mw for high activity, CMW) was reached. After the CMW, the activity was not affected by a further increase in the Mw. A similar pattern of activity was observed for chitosan. The CMW was determined to be 20 kDa for TMC and 50 kDa for chitosan

Poriferan Chitin as a Versatile Template for Extreme Biomimetics

In this mini-review, we shall first cover a short history of the discovery of chitin isolated from sponges; as well as its evolutionarily ancient roots. Next, we will delve into the unique structural, mechanical, and thermal properties of this naturally occurring polymer to illuminate how its physicochemical properties may find uses in diverse areas of the material sciences. We show how the unique properties and morphology of sponge chitin renders it quite useful for the new route of “Extreme Biomimetics”; where high temperatures and pressures allow a range of interesting bioinorganic composite materials to be made. These new biomaterials have electrical, chemical, and material properties that have applications in water filtration, medicine, catalysis, and biosensing