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Modification of polyamide 6.6 dyeing properties by grafting with poly(acrylic a...
Miranda, Teresa; Santos, Jorge Gomes; Soares, Graça M. B.978-972-8063-67-2 ; The wet chemical surface modification continues to be a growing area of research interest. This study describes preparation and characterization of poly (acrylic acid)-grafted polyamide 6.6 fabric. Poly(acrylic acid) has been grafted onto polyamide backbone using benzoyl peroxide (BPO) as catalyst in aqueous medium. The benzoyl peroxide initiator optimum concentration was 0.03 M. The best c...
Preparation of silk fibroin–poly(ethylene glycol) conjugate films through click...
Sampaio, Sandra; Miranda, Teresa; Santos, Jorge Gomes; Soares, Graça M. B.Azide silk fibroin (azido SF) and alkyne terminal poly(ethylene glycol) (PEG) 2000 (acetylene-terminal PEG 2000) were synthesized. Azido SF was reacted with acetylene-terminal PEG 2000 to produce films via a copper-mediated 1,3-cycloaddition (‘click’ chemistry) generating a triazole linkage as the networking forming reaction. Through click chemistry, novel silk-based films with various weight ratios were prepar...
A study on the spectral changes of reactive textile dyes and their implications...
Santos, Jorge Gomes; Soares, Graça M. B.; Hrdina, Radim; Campos, Ana M. F. Oliveira; Gomes, Jaime RochaEvidence is presented that confirms the colour changes of a widely used trichromatic mixture of bifunctional reactive dyes (Levafix CA) under alkaline conditions, showing that they occur slowly and throughout the dyeing time, and not instantly after alkali addition to the dyebath. Thus, it is impossible to determine the specific absorptivity of the dyes at each moment of the dyeing process. An investigation int...
How to improve dyeing and antimicrobial properties of cotton materials
Soares, Graça M. B.; Silva, Raquel; Vieira, Raquel; Santos, Jorge Gomes; Gomes, Jaime RochaComunicação apresentada no 20th IFATCC Congress, Weimer, Germany, 5 - 6 Maio 2005. ; In the present work, some specific amino compounds were linked to the cotton fabrics on a process that can impart at the same time dyeability and durable antimicrobial properties. The process was monitored on-line in a prototype dyeing system since the addition of cationic agents will influence dye uptake. Different dyeing con...
Studies of durability and effect on material properties of different antibacter...
Soares, Graça M. B.; Vieira, Raquel; Cardoso, Isabel; Santos, Jorge Gomes; Gomes, Jaime Rocha; Lança, Ana; Pereira, PabloFabric treatments imparting bactericide characteristics are highly desired by the apparel, home furnishings, and medical industries. However, conventional processes used to impart such characteristics have a major drawback. That is, these effects are not permanent and the properties of the material may be altered. Laundering or wearing of the treated fabric causes leaching or erosion of the agents responsible f...
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