Advanced Materials Research Vols. 332-334

Abstract: This paper is aiming to research the impact behavior of flax fiber reinforced PP laminates considering the end use of the products. Flax yarn and Polypropylene (PP) filaments were twisted together with three fiber volume fraction 0.45, 0.50 and 0.60 to form the commingled yarns which were woven into fabrics as prepreg with plain and twill structures respectively. The prepregs of different layers were pressed into flax reinforced PP composites in the process of hot-pressing. The laminates with different fiber volume fraction, layer, and woven structure were tested and analyzed respectively aiming at the impact resistibility in succession. SEM micrograph of the impact fracutured surface was observed and analyzed as well. The results reveal that the impact properties of laminates with twill structures are prior to those of laminates with plain structures when other technical parameters are the same. The ability of impact resistibility of flax reinforced PP laminates improves with the increase of the fibre volume fraction, layer amount and impact velocity respectively in this research.

Abstract: This work focused on the release behaviour and antibacterial efficiency of Polypropylene (PP)-based and Polyethylene terephthalate (PET)-based hollow fiber with silver particles incorporated (shortened as PP/Ag and PET/Ag). Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) were used to investigate the antibacterial capability of Ag/PP and Ag/PET with the method of antibacterial kinetics experiments. The antibacterial results demonstrated that all samples had an excellent antibacterial property against E. coli and S. aureus, and the antibacterial efficiency of Ag/PET was greater than that of Ag/PP. Furthermore, Inductively Coupled Plasma Atomic Emission Spectrometer (ICP-AS) was applied to detect the release behaviour of silver ions from Ag/PP and Ag/PET. And the results showed that in the same weight of silver incorporated in hollow fibers, the release behaviour of silver ions from Ag/PET was more than that from Ag/PP , which may be explained by the moisture absorption of the PP and PET. From the results of antibacterial and release experiments, it could be concluded that the release behaviour of silver ions from the fibers, which was depended on the moisture absorption of the matrix, was an important parameter to affect the antibacterial efficiency.

Abstract: A new spinning method was presented to spin three-axial stainless steel filament wrapped yarn by modified ring-spinning, where the stainless steel filament was set as the core yarn and the nylon filament for decoration wrapping the stainless steel filament in the fields of the fabric for Shielding application. A set of process parameters was obtained by the ring spinning frame improvement and spinning process optimization, which realized to spin nylon filament wrapped stainless steel filament yarn. Moreover, the structure, and tensile mechanical properties were measured on the wrapped yarns. The results show that the process can spin stainless steel wire wrapped yarn and acquire the excellent performance of the yarn.

Abstract: Two kinds of woven spacer fabrics were designed and woven with high strength low extension technical polyester filaments. Then the sandwich composite panels were built by filling polyurethane foam in the space of the fabric and combined the epoxy resin on the surface of the fabric by means of handle paste shaping craft. Finally the property of the composites，including the flexure, impact resistance and compression performance, were measured. The experimental results showed that the woven spacer fabric sandwich panels have high flexibility and rupture toughness. When the stesses of bending, impact and compression were relieved, No visible distroy of the integral panel structure was observed.

Abstract: Experimental study of the fading rate and mutation point of induction periods for three natural dyes are carried out. Besides, illuminace distributions and visual effects in two exhibiting modes, vertical hanging mode and inclining exhibiting mode under the same illuminace are investigated. The results of both experiments are analyzed and their implications for the safe exhibiting and lighting mode for museum silk textiles are discussed.

Abstract: Poly (3-hydroxybutyrate) (PHB)/poly (L-lactide) (PLLA)/poly (ethylene-oxide) (PEO) composite Ultrafine Fibers were prepared by solution dry spinning technique. Scanning electron microscope (SEM) and X-ray diffraction (XRD) were used to characterize the PHB/PLLA/PEO composite Ultra-fine fibers. In all of the spinning conditions investigated, the average diameter of the as-spun PHB/PLLA/PEO fibers was 2.1 μm and increased with increasing the mass ratio of PHB/PLLA. The degree of crystallinity of as-spun PHB/PLLA/PEO fibers increased with increasing PHB content in their blends, and the α-form crystals of PHB and PLLA in as-spun fibers were obtained. When the mass ration of PHB/PLLA in as-spun PHB/PLLA/PEO fibers was 3:1,the structure of as-spun fibers was the skin-core, which PHB formed core of fibers and PLLA form skin of fibers; when the mass ration of PHB/PLLA in as-spun PHB/PLLA/PEO fibers was 1:1, PLLA and PEO were embedded into PHB phase by droplet and febrile morphology to form matrix-fibril structure of as-spun PHB/PLLA/PEO fibers.

Abstract: A series of experiments was performed on studying the dynamic heat and moisture transferring procedure and evaluating heat and moisture comfort properties of different weight cotton fabrics. In experiments, the real time changes of temperature and relative humidity in inner and outer surfaces of different cotton fabrics were measured using self-made textile-microclimate measuring instrument. Then, the temperature and relative humidity in inner surface of fabric, and the difference of temperature and relative humidity between inner and outer surfaces of fabric were analyzed. Finally, in order to evaluate cotton fabric's dynamic heat comfort property and dynamic moisture comfort property comprehensively, two dynamic values were introduced to make evaluation. Results show that as the increase of cotton fabric's weight, fabric will have better thermal insulation performance and worse moisture permeability performance.

Abstract: Magnesium hydroxide (Mg(OH)₂) particles were synthesized and modified via a reaction-hydrothermal process in the present of NaOH. The resultant magnesium hydroxide was characterized by X-ray powder diffraction (XRD), field-emission scanning electron microscopy (SEM) and BET specific surface area. It was found that NaOH played a key role in the morphology and dispersion Mg(OH)₂ particles.

Abstract: In order to study the change of the filter cloth and the change of supramolecular structure after heat setting, two groups of filtering cloths were produced using polypropylene monofilament, Scanning electron microscope, IR Spectrometer FTIR and differential scanning calorimeter were used to observe the structure variation before and after heat setting. It was found that the fabrics in different groups exhibited significantly different surface structures, after heat setting. In addition, the infrared spectrogram and DSC data revealed that supramolecular structure of polypropylene fiber did not change after heat setting, since no new chemical bond was observed after heat setting.

Abstract: in view of the specialty of sparse woven fabric, a particular method of testing slippage resistance force of yarns has been designed. Several woven fabrics with different yarns count, friction coefficient, warp density and weft density and woven texture had been tested. The influencing factors for warp and weft slippage resistance force had been discussed and analyzed.