We modified the poly(ehtylene terephtalate) (PET) wire meshes with hydrophilic monomers by the electron beam irradiation induced graft-polymerization method, to protect the PET meshes from pitch stain in papermaking process of recycled papers. Di-hydroxyethyl methaclylate (HEMA) with the hydroxyl group, acrylic acid (AA) with the carboxylic group, acrylamide with the amide group and glycidyl methacrylate (GMA) with the epoxide group were used for grafting onto the fiber surfaces of the PET meshes. Grafting efficiency and hydrophilic property were studied by means of grafting ratio and FTIR spectra and by contact angle of water, respectively. As a result, PET mesh which di-hydroxylated after GMA grafting was found to show the most hydrophilic properties.
Five kinds of cotton fabrics were treated using a practical liquid ammonia unit and consequently treated with hot water at 70°C or 130°C for two hours. The lattice type, the washing shrinkage, the water retention, the moisture absorbency, the dry and wet crease recovery angle and the bending repulsion were measured. Five data items for each measurement were averaged and analyzed. Due to the hot water treatment after liquid ammonia treatment, the dry crease recovery angle and the bending repulsion were decreased; on the other hand, the water retention, the wet crease recovery angle and the moisture absorbency were increased. These changes represent a rearrangement of the hydrogen bonding from a non-swollen state to a swollen state and stabilization of the fiber shape in the swollen state. Through this stabilization, a decrease in the washing shrinkage is thought to occur. The changes of the lattice type by the hot water treatment occurred a little at 70°C and occurred largely at 130°C. On the other hand, the washing shrinkage and other physical properties changed largely at 70°C. These results suggest that the decrease of washing shrinkage and the changes in the other properties depend mainly on the changes in the amorphous region.
Strain 2Cb that hydrolyzed the ester bond of ethylene glycol dibenzoate (EGDB) efficiently was isolated. We describe its isolation and its identification as a Rhodococcus sp. based on morphological and rDNA sequencing. In a medium containing 0.5% of EGDB at pH 7.0, 30°C, the strain completely degraded EGDB in 30 days. The strain also grew on benzoic acid, p-hydroxybenzoic acid, and protocatechuic acid as the sole source of carbon. Distribution study of EGDB degrading enzymes indicated that the degradation activity was found on the cell surface.
Wool fabrics were treated by corona discharge irradiation at different experimental conditions in this study. The results showed that the moisture regain of the samples, the corona discharge voltage and the treating times have complicated influences on the shrink-resistance and the hydrophilic properties of the treated fabrics. The shrink resistance of the fabric can be further improved by combining corona discharge irradiation with enzyme or resin treatment which are widely used in the treatment currently.