Advanced Materials Research Vols. 332-334

Abstract: In this study, the image definition of animal fibers captured by Axioskop 2 MOT PLUS differential interference contrast (DIC) light microscope using 1-bromonaphthalene, diethylene glycol, n-decyl alcohol, and ethylene glycol monomethyl ether as embedding medium, respectively, is compared with the image definition obtained using paraffin wax, the reference embedding medium. The effects of the four kinds of embedding media on the image definition of camel cashmere, yak cashmere, wool, and cashmere are also analyzed. Results show that topographical feature, scale structure, and pigmentation are better visualized when n-decyl alcohol is used as embedding medium compared to when the other kinds of embedding media are used. This meets the requirement of computer image analysis method for the identification of camel cashmereand yak cashmere fibers. Furthermore, the image definition of wool and cashmere is clearly improved when n-decyl alcohol is used as the embedding medium compared to when paraffin wax is used in the same condition.

Abstract: In this paper the components of Broussonetia Papyriferalvent (BP) white bast were tested and compared with some bast fibers such as hemp, flax, jute and and ramie, the cellulose content is as high as 63.76wt%. The bio-enzyme pre-trement and alkali-H2O2 one bath processing were employed to extract BP fibers. The effect of bio-enzyme pre-trement and alkali-H2O2 one bath processing on the morphological structure of cellulose was investigated with X-ray diffraction (XRD). The tensile and moisture properties of BP fibers were tested and discussed.

Abstract: Degumming technology of broussonetia papyrifera fiber with ultrasonic wave- microwave assisted to chemic technique and alkaline pectinase was introduced in this article. Practice showed that this degumming technology had the characteristics of efficient, little pollution and excellent fiber performance index. It would have broad prospects in the degumming process of broussonetia papyrifera bark and other similar material.

Abstract: PVC coated fabric has poor self-cleaning property. The surface treatment with TiO2 can improve the self-cleaning property of PVC coated fabric by photocatalysis. The surface treatment agent used in this experiment contains nano TiO2 power and PVDF. The treatment of coupling agent can improve the surface properties of nano TiO2 power and the performance of the surface treatment agent. The effects of coupling agent on the modification of nano TiO2 power and the surface morphology of the treated PVC coated fabric were researched by IR and SEM respectively. The photocatalysis of the top layer on the treated PVC coated fabric was evaluated by the degradation of methyl orange dye.

Abstract: In this study, sisal fiber and lotus petiole fiber were compared in structure and properties. SEM photos showed that the sisal fiber surface was rough, but lotus petiole fiber was smooth. The thermal properties of lotus petiole fiber and sisal fiber were studied with TG, the results shown that the law of degradation of the two fibers is similar. FT-IR measurement could confirm that the composition of the two fibers was almost the same.

Abstract: segment-color yarn is a new type yarn. It can be spin by ring frame with computer numerical control. The basic principle of spinning segment-color yarn was developed in this paper. The main parameter of segment-color yarn were discussed. This can help produce high quality segment-color yarn.

Abstract: Cotton fabric with excellent antibacterial properties was obtained by treated with polyamide-amine (PAMAM) dendrimers as a carrier and silver nitrate as an antibacterial agent. The antibacterial cotton fabrics were prepared by the methods of one-bath process and two-bath process. Antibacterial activity of cotton fabrics treated by two different methods was good, but the antibacterial durability of cotton fabric treated with two-bath process was better than that treated with one-bath process. After 50 washing cycles, cotton fabric treated with two-bath process still had good antibacterial property and its inhibitory rate to Gram-positive S. aureus and Gram-negative E. coli was over 99 %. It was found that the breaking strength retention of finished cotton fabrics was 85.83 % and the decrease of cotton fabrics’ whiteness index was about 15 %.

Abstract: Melting point of cotton waxes and effects of temperature on cotton waxes removal were investigated. Based on these results a temperature control process for cutinase was developed to improve cotton waxes removal: Firstly cotton fabric was treated by cutinase at 70°C for 10 min, and then the treatment temperature was switched to 55°C and kept this temperature till to the end of the treatment. As a result, maximal cotton waxes removal of 67.69% for cutinase and 75.37% for combined enzymes (cutinase with pectinase and cellulase) were achieved, which was 17.96% and 13.88% higher than that of treatment at 55°C for cutinase and combined enzymes respectively. Moreover, the mechanism involved in enhancing cotton waxes removal in temperature control process was also discussed.

Abstract: Thick defects and thin defects are the important targets of assessing the quality of the raw silk. To rationally establish the grading standards of raw silk, the frequency distributions of thick and thin defects of the raw silk should be found out. For this purpose, tests by the raw silk electronic detector were done to investigate the frequency distributions of thick and thin defects in the electronic testing for raw silk, and the fact that the thick and thin defects appropriately take negative binomial distribution as well as Neyman distribution in the electronic testing was confirmed by fitting test.

Abstract: Eliminating the prickle of ramie knitting fabric was studied by using cellulose, through the method of quadratic general rotary. The influence factors including pH value, cellulose enzyme density, liquor ratio, temperature and time of the treatment fluid were investigated. The optimum processing conditions for eliminating prickle of ramie knitting fabric were determined as follow: pH 5, 3%(o.w.f) cellulose enzyme density at liquor ratio of 1:20 for 45min at 45°C.