Search results for "dyeing"
showing 10 items of 21 documents
Effects of Different Test Setups on the Experimental Tensile Behaviour of Basalt Fibre Bidirectional Grids for FRCM Composites
2020
Fibre-reinforced cementitious matrix (FRCM) composites have been effectively used during the last ten years for the strengthening of existing concrete and masonry structures. These composite materials are made of medium- and high-strength fibre meshes embedded in inorganic matrices. Synthetic fibres are the ones that are currently the most used
An aging evaluation of the bearing performances of glass fiber composite laminate in salt spray fog environment
2019
The aim of the present paper is to assess the bearing performance evolution of pinned, glass-composite laminates due to environmental aging in salt-spray fog tests. Glass fibers/epoxy pinned laminates were exposed for up to 60 days in salt-spraying, foggy environmental conditions (according to ASTM B117 standard). In order to evaluate the relationship between mechanical failure mode and joint stability over increasing aging time, different single lap joints, measured by the changing hole diameter (D), laminate width (W) and hole free edge distance (E), were characterized at varying aging steps. Based on this approach, the property-structure relationship of glass-fibers/epoxy laminates was a…
Modular Paradigm for Composites: Modeling Hydrothermal Degradation of Glass Fibers
2021
Fiber-reinforced composite materials are often used in structural applications in humid, marine, and offshore environments. Superior mechanical properties are compromised by environmental ageing and hydrolytic degradation. Glass fibers are the most broadly used type of fiber reinforcement to date. However, they are also most severely affected by environmental degradation. The glass fiber degradation rates depend on: (1) glass formulation; (2) environmental factors: pH, T, stress; (3) sizing; (4) matrix polymer; (5) fiber orientation and composite layup. In this short review (communication), seven modules within the Modular Paradigm are reviewed and systematized. These modeling tools, encomp…
Screening of some banned aromatic amines in textile products from Indian bandhani and gamthi fabric and in human sweat using micellar liquid chromato…
2021
Certain dyes in textile products, which are capable of reductively splitting into carcinogenic aromatic amines, are strictly controlled in many countries. A simple, rapid, sensitive and green chromatographic method has been developed and validated for the simultaneous determination of 4-aminophenol (4-AMP), p-phenylenediamine (p-PPD) and benzidine (BNZ), banned aromatic amines in dyeing clothes and human sweat. The separation was achieved using a micellar mobile phase of 0.1 M SDS, 4% 1- butanol (v/v) buffered to pH 7 with sodium dihydrogen phosphate, flowing under isocratic mode at 1 mL/min through a C18 column. Photodiode array detector was set at 210 nm. Using the above chromatographic c…
Coloristic and antimicrobial behaviour of polymeric substrates using bioactive substances
2016
A major concern in reducing microbial contamination of healthcare and hygiene products motivated us to seek viable alternatives in order to create such barriers. The antimicrobial and anti-oxidant effects of natural extracts are well-known, their application onto polymeric supports is still challenging in terms of investigation. To our knowledge, the method of natural dyeing of different polymeric substrates using bioactive substances derived from black currant and green walnut shells, in conjunction with biomordants, and their long term effects have not been very consistently reported. The main objective of the study is based on the comparative study of different polymeric fibrous substrat…
Health-Improved Textiles Obtained by Heat Surface Ecodyeing Treatments
2015
The central idea of the present research aims at achieving textile substrates through an efficient inclusion of a wild black cherry extract into the grafting agent-monochlorotriazinyl-β-cyclodextrin (MCT-β-CD). The methodology consists in a permanent/irreversible entrapment onto the fibres surface of the natural extract through inclusion mechanism. Exhaustion and sonication dyeing procedures were used alternatively. The obtained materials were characterized, by FT-IR and BET analysis. The experimental results reveal good adsorptive feature of the samples, due to a higher specific surface created by the inclusion complex (MCT-β-CD-dye pigment). An efficient blocking of the natural dye pigmen…
Domowe sposoby farbowania włosów z wykorzystaniem surowców roślinnych
2022
Koloryzacja roślinna jest naturalną metodą farbowania włosów, która pozwala na uzyskanie różnych barw oraz dodatkowo pielęgnuje skórę głowy i włosy. Celem pracy było przybliżenie wiedzy na temat dostępnych metod farbowania z wykorzystaniem surowców roślinnych oraz zbadanie potencjału kolorystycznego wybranych ziół. Jako testowane rośliny wybrano lawsonię bezbronną, ketmię szczawiową, rzewień, bez czarny oraz rumianek pospolity. Aby ukazać wpływ procesu koloryzacji na strukturę oraz wygląd: kory, otoczki i rdzenia włosów, użyto wideodermatoskopu. Naturalną metodę farbowania włosów cechuje niższy potencjał alergizujący w stosunku do syntetycznej. Jednak biorąc pod uwagę ograniczenia kolorysty…
Strengthening of Masonry Columns with BFRCM or with Steel Wires: An Experimental Study
2016
Nowadays, innovative materials are more frequently adopted for strengthening historical constructions and masonry structures. The target of these techniques is to improve the structural efficiency with retrofitting methods while having a reduced aesthetical impact. In particular, the use of basalt fiber together with a cementitious matrix emerges as a new technique. This kind of fiber is obtained by basalt rock without other components, and consequently it could be considered a natural material, compatible with masonry. Another innovative technique for strengthening masonry columns consists of applying steel wires in the correspondence of mortar joints. Both techniques have been recently pr…
Indigon sinisestä kokenillin punaiseen : tekstiilivärjäyksessä käytettyjen luonnonväriaineiden tuonti Suomeen (1791–1856)
2022
Tutkimme ulkomaisten luonnonväriaineiden tuontia Suomeen 1790-luvun alusta 1850-luvun puoliväliin. Ajankohtaa voidaan luonnehtia murroskaudeksi väriaineiden käytön historiassa. Selvitämme mitä väriaineita Suomeen tuotiin, millaisia määriä, minneniitä tuotiin sekä mistä satamista väriainelastit olivat lähtöisin. Lähdeaineistomme perustan muodostavat Tanskan Juutinrauman tullitilit, joista on koostettu suomalaisia satamia koskeva tietokanta (FIN-STRO: 1560/1791–1856). Lähdepohjaa on täydennetty muulla tilastoaineistolla sekä laadullisella materiaalilla, kuten värjäysoppailla ja Kansalliskirjaston digitaalisella sanomalehtiarkistolla. Tutkimme erityisesti sinistä, punaista ja keltaista väriä t…