STUDIES ON DYEING OF POLYOLEFINS
| Autor: | Izumi Fumoto |
|---|---|
| Rok vydání: | 1965 |
| Předmět: | |
| Zdroj: | Sen'i Gakkaishi. 21:590-597 |
| ISSN: | 1884-2259 0037-9875 |
| DOI: | 10.2115/fiber.21.590 |
| Popis: | Polypropylene fibre was fluorinated in nitrogen atmosphere with fluorine gas at 25°C. The effects of fluorination on the dyeing, physical and chemical properties of polypropylene fibre were investigated.The infra-red spectrum of fluorinated fibre container a broad and intense absorption over the 1040_??_1340cm-1 range. This absorption is very characteristic for fluorinated fibre, may be due to C-F linkage. The infra-red spectrum of fluorinated fibre treated with hot alkaline aqueous solution no longer displays the absorption over the 1040_??_1340-1 cm range and a new absorption at 3400cm-1, presumably arising from C-OH linkage, The results indicate that the C-F linkage in the fluorinated fibre is hydrolyzed by the treatment with alkaline solution. The infra-red spectrum of the fluorinated fibre treated with hot water is virtually identical with that of original fluorinated fibre, and it might be concluded that the C-F linkage in the fluorinated fibre is stable to hot water. By the treatment with hot water, however, the fluorine content of the fluorinated fibre is clearly reduced. This means that not all of the fluorine atoms in the fluorinated fibre are chemically bonded with the fibre, but some of them are merely adsorbed physically on the internal surfaces of the fibre, presumably in the form of HF.An examination of X-ray diagrams of polypropylene fibre, fluorinated polypropylene fibre and polypropylene fibre fluorinated and then treated with hot water shows that fluorination causes a decrease in the crystallinity of polypropylene fibre, and with hot water treatment an increase in that of fluorinated fibre.Fluorination has a pronounced effect on the dyeing properties of polypropylene fibre for cationic dyes. The fluorinated fibre could be easily dyed with cationic dyes from neutral or slightly alkaline dye-bath at 100°C. Under the acidic condition, however, the penetration of cationic dyes into the fluorinated fibre could not be attained even at 100°C. A probable mechanism involving the iondipole interaction between positively charged dyes and C-F groups in the fluorinated fibre suggest to explain the dyeing behavior of cationic dyes. The dyeing properties for disperse dyes are scarcely affected by fluorination. |
| Databáze: | OpenAIRE |
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