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The influence of different treatment media on the structure of PET fibres
Sfiligoj-Smole, Majda ; Zipper, Peter
The changes of supramolecular structure of PET fibres upon supercritical fluid (SCF) dyeing, conventional water dyeing, hot air thermofixation at 130°C, respectively were studied. The following ...observations were made: the increase in crystallinity is nearly alike with the SCF and water treated sample, while hot air results in lower crystallinity change. There is only a very slight change in the periodical structure along the fibre axis, determined by the long period. The diminution of the long period by the treatment at 130°C is nearly alike with SCF and hot-air treatment, while water medium decreases the long period less. The strongest influence on dimensions of crystallites is observed with water, while hot air and supercritical CO2 cause a smaller diminution of the crystallite sizes. After the treatments a slight disorientation is observed irrespective of the medium used. Perhaps water represents the medium where the relaxation process occurs easier and a slightly greater fall of orientation function is detected. Compared to SCF treatment of PET fibres both other treatment media cause a more pronounced change of the micro-void system and the inhomogeneity form factor additionally increases with the latter two treatment media. From only very slight differences between the samples treated at 130°C in different media a conclusion follows: obviously the medium used is not the main influence, but temperature used has the greatest influence.
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