Advanced Materials Research Vols. 332-334

Abstract: In this paper, the photocatalytic degradation of methylene blue solution by photocatalysis bamboo charcoal fiber knitted fabric was studied. The relationships were analyzed between the photocatalytic degradation rate and the reaction time, the initial concentration, pH of methylene blue solution, and the distance between the UV light centre and liquid level. The results indicates that there is an remarkable photocatalytic degradation effect of methylene blue solution by photocatalysis bamboo charcoal fiber knitted fabric under UV-irradiation, even the degradation rate could reach to 67.02%. The degradation effect was better with lower initial concentration of methylene blue solution, higher initial pH，and the shorter distance between light centre and liquid level.

Abstract: In this paper, polyphenylene sulfide（PPS） was synthesized through reactions of sodium sulfide and p-dichlorobenzene in N-methylpyrrolidone. Then antioxidant 4426, montmorillonite(MMT) were added into the PPS resin to improve its thermal oxidation stability. The polymer was characterized by FT-IR, Raman, and XRD analysis. Differential Scanning Calorimetry (DSC) was used to mensurate the oxidation induction temperature (dynamic OIT) of PPS, and Thermogravimetric analysis(TGA) was used to evaluate the thermal oxidation stability of PPS. The results showed that the addition of the antioxidant 4426, montmorillonite(MMT) leaded to a good improvement of the thermal oxidation stability of PPS. The PPS's dynamic OIT could up to 480.07°C and 481.61°C after mixed with MMT and anti-oxidant 4426, respectively. the sample of PPS mixed with both MMT and anti-oxidant 4426 has a dynamic OIT of 482.7°C.

Abstract: In present paper, the compression force and strain curve for both plane plate and spherical ball compressions are conducted, where the compression stress and strain curve in plane plate compression is calculated and divided into three linear sections. Each linear region has corresponding compression modulus. In addition, three compression characters of both plate plane and spherical ball compressions are featured as compression work, maximum pressure/force and linear degree. Correlations between the three characters of compression property show that there exist high correlations between compression work and maximum pressure/force for plane plated and spherical ball compression. Moreover, effects of sample size and shape on compression properties are also conducted, and we find that there are no significant effects and the three compression characters are stable in both plane plate and spherical ball compression. Finally, the explicit formula derived in the Part I of this series for the spherical ball compression is used, and the ball compression force and strain curves are simulated based on the compression stress and strain curves based on plane plate compression tests. The comparing results between measured and theoretical results indicate that the theoretical model is effective to simulate ball compression behaviour of general knitted spacer fabrics. It is highly helpful in designing and predicting compression force of knitted spacer fabric for virtual processing of textile materials.

Abstract: Because of the performance and cost, airbags are mainly made of coated or uncoated Nylon 66 fabrics. Different airbags, which use different fabrics, vary in the inflation and expansion of the airbag and the protecting function on vehicle occupants. Based on HIC drawn from pendulum impact tests conducted with 45L airbags, the paper analyses influence of some special critical characteristics of airbag fabrics into the performance of airbags. The results show that the weight and the air permeability are the main factors that influence protecting function of airbag. Under the condition of enough fabric strength, light and thin fabric is more preferable in making airbags.

Abstract: In order to know the absorption performance of Acrylic gel fiber(AGF) on heavy metal ion and provide theoretical basis for its application research on sewage disposal area, Effect of CuSO4 solution temperature, concentration, PH, absorbing time and Na+ concentration on absorption properties were researched. The investigations showed that with increasing of solution temperature, absorption of Cu2+ increased first and then decreased. Absorbed amount of Cu2+ decreased gradually with the reduction of PH value in acidic solution. With CuSO4 solution concentration uprising, absorption capacity of AGF increased. With absorption time prolonged, absorption capacity increased rapidly first and then turned to ease gradually. Absorbed amount of Cu2+ reduced sharply to almost zero with the concentration of Na+ increased. The absorption behavior of Cu2+ and water molecule is highly correlated.

Abstract: Rabbit hair has been expected to be a partial replacement of cashmere, due to its excellent performance and relatively cheaper price. However, the attempt has not been successful, since the morphological structure of the rabbit hair is quite different from other animal hairs. The literature regarding rabbit hair is fairly rich, but the morphology of rabbit hair is too complex to make a very certain conclusion. Hence, the morphological structure of rabbit hair was investigated again in this study, using optical microscopy and the scanning electron microscopy. The basic shape of the hair scale, the cortex distribution and the medulla of different fineness were studied. It was founded that no medulla existed when the diameter was less than 10um. When the fiber diameter was between 10um and 20um, there was normally one medulla layer. Two and three medulla layers occurred when fiber diameter was between 20um and 30um. When the diameter was more than 50um, multi-layers of medulla presented. Keywords: Rabbit Hair, Morphological Structure, Scale Layer, Cortex Layer, Medulla Layer.

Abstract: In order to improve the antibacterial property of silk fabric, nano-silver was used to deal with the silk fabric by steaming in the light of in-situ methanism. All of the factors which affect the content of nanosilver and the whiteness of the finished silk were studied. These factors are the concentration of RSD solution, the concentration of silver nitrate solution, the steaming temperature and the dipping time. The optimum technology obtained was showed as follows: the silk fabric should be treated with the concentration of 2g/L RSD and the concentration of 0.085g/L silver nitrate, and steamed for 30 minutes after dipped for 5 minutes. The results of the inhibition zone test and the antibacterial rate test indicated that both the silk fabric finished by the optimum technology and the one settled by five times diluted optimum technology showed highly antibacterial property. Even if the solutions are diluted by 5 times, the antibacterial rate of finished fabric is up to 99.67% to Staphylococcus aureus and 99.99% to Escherichia coli. Meanwhile, the inhibition zone is 7.9mm to Staphylococcus aureus and 8.3mm to Escherichia coli. In addition, the whiteness of the finished fabric was changed a little.

Abstract: Key morphological features of rabbit hair were investigated and compared with these of cashmere fiber. When the rabbit fiber diameter was about 10um, the angle of scale edge to the fiber axis was small. When the fiber diameter was around 40um, scale edges inclined larger angles to the axis. In addition, no overlapping and checks along the scale edges were observed in such coarse hair. The rabbit fiber diameters were normally between 10um and 20um and the scales of these fibers were long strip shaped with sharp tip at the middle. There was obvious boundary in the cashmere fiber after dyeing. One side is far darker than the other. On the contrast, this bilateral structure was not observed in the rabbit hair samples. The cortical cells presented in an uneven distribution in the rabbit hair. The mean ratio of medulla (filled with plenty of air) to fiber diameter was about 40%, which provide excellent thermal insulation to the rabbit hair assemblies.

Abstract: In this paper, a new type of LLDPE/nano CaCO3 composite based artificial turf yarns with good tensile property and UV resistance is introduced. The effect of nano CaCO₃ content on tensile properties shows that the tensile force reached the maximum value when the CaCO3 content is about 7wt%, and the elongation at break gets to the highest point at 10wt%. After 3000h UV accelerated aging, the nano-CaCO3 and LLDPE based artificial turf fiber yarns has tensile strength retention about 87%, and the elongation at break is higher than LLDPE. DSC results shows that with the increase of nano-CaCO3 content, the crystallization temperature gradually increased, and the crystallinity degree declined. SEM images of cross sections of monofilament fibers show that nano CaCO3 had a good dispersion in monofilament fiber matrix. These reasons give rise to the improved mechanical properties of turf yarns.

Abstract: The multiaxial warp-knit fabrics of glass fiber or carbon fiber as the structure materials have widely applied to many industries. In this study, in order to combined the advantages of these two fibers, glass fiber and carbon fiber were employed as reinforcement materials in RIMR 135 epoxy resins, and hybrid composites were formed. The tensile behavior of hybrid fiber-reinforced plastics (HFRP) were compared with CFRP and GFRP on the longitudinal orientation . The results suggested that HFRP was high tensile strength and modulus of elasticity. Scanning electron microscopy was used to characterize the morphology of damaged surfaces. The micrographs revealed that CF and GF maintained their own tension behavior in the hybrid composite materials as well in the neat FRP materials. The hybrid effect of HFRP was investigated by the hybrid theory, which was compared to the experimental results. It was confirmed that the tensile behavior of the hybrid composite materials matched the plus hybrid effect.