Inclusion complex of cyclodextrin (CD) with vitamin E (VE) or iodine was fixed onto a fabric using water
based polyisocyanate as a crosslinker, and their durability and anti-oxidant activity or bactericidal activity were
discussed. γ-CD complex was used for VE and α-, β-, or methylated β-CD complex were used for iodine. The poly(ethylene terephthalate) fabric was dipped into a suspension of a complex and polyisocyanate, and the fabric was cured to prepare a network of the complex and polyisocyanate. When a complex was fixed on the fabric with empty CD of its same kind showed higher fixed rate of VE or iodine. The fabric showed higher durability when a complex was fixed using treatin solution with lower ratio of a complex and higher ratio of a catalyst on polyisocyanate at higher curing temperature. For the fabric with the highest durability, 20 % of VE remained on the fabric even after 50-times wash. Anti-oxidant activity of the fabric was evaluated from the quenching of 2,2-diphenyl-1-picrylhydrazyl radical. The iodine-fixed fabric showed bactericidal activity after 10-times wash, which came up to the anti-bacterial standard of textile for general-use (orange ravel) of Japan Textile Evaluation Technology Council (SEK).
Polypropylene fibers, prepared by melt-spinning of the resins which have various melt flow rates (MFRs),
were drawn with the laser irradiation heating. As a result of WAXD measurements, it was revealed that the as-spun
fibers made from the resin whose MFR less than 30 contains α crystal. Comparing with the same draw ratio, the higher
tensile strength and Young's modulus were obtained for the lower MFR. However, the maximum draw ratio was
increase with the increase of MFR. Therefore, the maximum Young's modulus of 156 cN/dtex was obtained from the
highest MFR resin. In contrast, the maximum tensile strength of 9.59 cN/dtex was obtained for the fiber made of
MFR11/MFR30 melt-blend. Moreover, the utility as the concrete pieces fall protection sheets was evaluated for the
fabrics made by the drawn fiber. The punching load of 1.5 kN was obtained for the fabric of mock leno weave with the
use of acryl resin adhesive.
The function of molten urea as the solvent for wool and other animal proteins were investigated. Molten urea
at 150 ºC could dissolve wool without addition of water or any other chemicals. Also, it could dissolve other animal
proteins such as hair, feather and silk. When the concentration of wool in molten urea was up to about 10 %, the recovery of water soluble and water insoluble keratins were determined by 13C-CP/MAS NMR spectroscopy. It was found that the water soluble keratin consists of 61 % β-sheet and 39 % α-helix, and the water insoluble keratin almost consists of β-sheet. The result of nitrogen content assay by elementary analyzer revealed that 9.2 % (w/w) urea par water soluble keratin might form chemical bonds with the keratin.
In order to examine the distribution of a polyacrylamide (PAM) on exact fiber surface, the latest imaging
with a scanning ESCA microprobe, which analytical depth is up to 10 nm, was adapted to papers containing a cationic
PAM dry strength resin. The exact surface PAM contents were significantly higher than the total PAM content, which
indicates that the PAM added would be concentrated nearby the surface of fibers. And the degree of the concentration
decreased with increasing in beating degree. C1s and O1s images apparently showed unevenness due to the surface
roughness of paper irrespective of beating degree of the fibers, although these images derived from cellulosic fibers
may be expected to show their uniform distributions. On the other hand N1s image derived from the PAM gave isolated
and scattered signals. This characteristic distribution of the PAM on fiber surface differed from the generally uniform
in-plane distribution of the PAM within a fiber wall as shown in the imaging with a microscopic ATR/FT-IR in which
the analytical depth is about 1 µm.