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The influence of acid dyes upon some structural and physico-mechanical indices of polyamide fibres

Nedkova M., Pavlov P., Pishev D.

Autex Research Journal

2005

Vol. 5, no. 3

162--175

The influence of three acid dyes upon some physico-mechanical indices of polyamide multifilament yarn has been studied as a consequence of the structure modifications which occur during the dyeing process. It has been established that, irrespective of the differences in the chemical composition of the dyes, the modifications in the properties of the samples used are quite similar. Some structural characteristics, tenacity and elongation at break, crease resistance and the critical time of dissolution, have been determined. The dependencies of the indices listed on the dye concentration are of a complex character, which reflects the gradual penetration of the dye molecules into the inter-fibrillar and intra-fibrillar amorphous areas of the structure which are different in solidity. The fluctuations in the course of the dependencies in the area of the lowest concentrations are the result of the combined influence of the processes of improvement of the crystal phase and the relaxation phenomena, occurring in the most accessible amorphous areas of the fibrous structure. With the increase in the dye concentration, the so-called 'cross-linking effect' starts to appear, as a result of the formation of inter-molecular links of the polymer-dye-polymer type, which influence the properties under investigation in a characteristic way. The increase in the dye presence in the substrate provokes the repeated alternation of the above-mentioned phenomena in the thicker amorphous areas of the samples, with a pronounced influence of the 'cross-linking effect' in the highest concentrations.

Influence of Reactive Dyes on the Structure and Physico-Mechanical Properties of Viscose Fibres

Pavlov P., Nedkova M.

Fibres & Textiles in Eastern Europe

2002

Vol. 8, no. 2 (37)

60--64

The influence of three monofunctional reactive dyes on the physico-mechanical properties, relaxation characteristics and deformation behaviour of viscose rayon is followed as a consequence of the structural alterations occurring during the process of dyeing. The alteration in the studied indices is of a complex character, which reflects the two-stage penetration of the dyes in which inter-fibril and inner-fibril amorphous regions of the structure differ in density. The alterations registered in the propertiesy are the result of the complex influence of the relaxation processes and the 'cross-linking effect' in the regions of the viscose fibres mentioned.

Badano wpływ trzech monofunkcyjnych barwników reaktywnych na właściw fizyko-mechaniczne, charakterystyki relaksacji i przebieg deformacji jedwabiu wiskozowego, wynikające ze zmian strukturalnych zachodzących podczas procesu barwienia. Zmiany badanych parametrów mają skomplikowany charakter spowodowany dwustopniową penetracją barwników w amorficzne przestrzenie międzyfibrylarne oraz do wnętrza fibryli, stanowiące obszary o zróżnicowanej gęstości. Zmiany właściwości są wynikiem oddziaływania zarówno procesów relaksacyjnych jak i sieciowania w wyżej wspomnianych obszarach włókien wiskozowych.