部分加水分解した羊毛繊維および羊毛粉末のサクシニル化とその吸水性への効果

Wool fiber and powder were succinylated with succinic anhydride in aqueous alkaline solution in order to improve water absorbability after partial hydrolysis with HCl that was a pretreatment to enhance the reactivity. Succinylation after partial hydrolysis raised the water absorbabilities of both samples to ca. 5 times. The water absorbabilitiy of the succinylated samples and add-ons of succinic anhydride showed a linear relationship in each case of wool fiber and powder, which suggests that carboxyl groups introduced in the samples by succinylation contribute the absorbance of water. Water regain of these samples also increased by 1.0～4.1% after the partial hydrolysis and succinylation

化学処理による羊毛への消臭機能の付与

Some chemical treatments were applied to convert wool fibers into a polymeric material with high deodorization performance for the purpose of effective re-use of waste wool fibers. Oxidation with performic acid remarkably accelerates sorption of ammonia to wool fibers, which suggests that enrichment in -SO_3H is very effective in sorption of ammonia. Succinylation with succinic anhydride of the oxidized wool fibers shows no improvement of the sorpability, because sulfonic and carboxylic groups in the wool fibers respectively formed the sodium salts through succinylation reaction in phosphate buffer solution with using NaOH. On the other hand, it was found that wool fibers reduced with 2-mercaptoethanol slowly sorb vapor of ethylmercaptan

染色したセルロース繊維の光劣化について

The influence of reactive dyes on the photodegradation rates of cellulosic fabrics (cotton, linen, rayon) were evaluated. Cellulosic fabrics were dyed with reactive dyes and then exposed to xenon arc lamp light for incremental doses for up to 40 days. Changes in color, tensile strength, a degree of polymerization (D.P.) and cellulose crystallinities were evaluated. After exposure each undyed cellulosic fabric showed a greater loss in tensile strength and D.P. than the dyed fabrics. Tensile strength and D.P. of dyed rayon fabrics decreased at a constant rate. The tensile strength of dyed cotton and linen also decreased similar to that of the dyed rayon, but D.P. of cotton and linen didn\u27t decrease severely as the tensile strength. This suggests that cleavages of glycoside linkage as well as pyranose ring and/or hydrogen bonds may occur by exposure to the light. Crystallinity did not change after the exposure. From this result, it was thought that both crystalline and amorphous regions in the fibers degraded