Yong Zhu Cui

The Effect of Ultrasonic Wave Pretreatment of Reed Leaf Cellulose Dissolved in Ionic Liquids

It took long time for reed leaf cellulose to dissolve in ionic liquid (1-butyl-3-methylimidazolium chloride), and part of the cellulose was degraded and the fiber strength reduced greatly. In order to decrease its dissolution time, the ultrasonic wave pretreatment was applied in this article. Results were showed through polarizing microscopy, SEM, FT-IR and XRD. By comparing the original fiber with the regenerated cellulose, it can be concluded that Ultrasonic wave pretreatment significantly increased the crystallinity of the fiber, weakened the fibrillation on fiber surface obviously, which proved the process was a physical change and did not affect the cellulose structure.

Design and Manufacture of 3D Flat Woven Fabric

In the ordinary loom, the 3D woven fabrics like the orthogonal/connected stitching structure, angle Alliance/interlocked stitching structure by the reasonable transformation, weaving diagram and looming draft, have been woven in this paper. Using ordinary loom weaving fabrics, it would not only save the cost of production, but also has good controllability of woven fabrics. Good structural design and integrity of the 3D woven fabrics, own tight fabric structure, superior mechanical properties, low price, and broad application prospects. The results shows that this design would give a basis for further study on the development perform of 3D textile structural composite materials.

Sound Insulation Properties of Abandoned Fibers Composites

In this article, in order to study the sound insulation properties, abandoned cotton and jute fibers were conducted as reinforced materials, TPU and PP were conducted as matrix materials, and double roller mixing and hot pressing molding processes were adopted to prepare composites. Through the L12 (42×13) mixed orthogonal experiment, cotton/TPU, cotton/PP, jute/TPU and jute/PP composites were prepared respectively. Standing wave tube and impedance tube’s sound absorbing and insulation test system which was produced by Beijing Prestige Company were employed to test the sound insulation (transmission loss). And they were used origin software to analyze. Universal mechanical testing machine and Jane suspension combined impact tester were employed to test tensile, bending and impact strength of jute/TPU composites. Results were showed that four kinds of composites had excellent sound insulation properties. And the jute/TPU composite was the most optimal. Under the conditions of thickness in 6 mm and frequency at 6300Hz, transmission loss of jute/TPU composites was up to 30 dB and it had excellent mechanical properties.

Immobilization of Hydroxyapatite Particles onto PET Filter Fabric via Heat Treatment

Heat fusion method and hot-press method were applied to immobilize hydroxyapatite (HAp) particles onto the surface of PET filter fabric separately. The effects of treating temperature, treating time and HAp amount on immobilization rate of HAp and pore size of filter fabric were discussed. The high immobilization rate of HAp could be obtained and pore size could be maintained. FTIR, SEM and XRD were used to characterize the structure of filter fabric embedded with HAp particles. Good adsorption property of Cd2+ onto HAp immobilized filter fabric was achieved.

Dye-Free Coloration in Dyeing and Printing of Tussah Silk Based on PHBA

Dye-free coloration in dyeing and printing for tussah silk were studied in different conditions. The optimal processes of dye-free and printing has been got. The optimal process of dye-free was PHBA1.5%, acid 14%, 60°C for 30 min, then add H2O2 for oxidation. And the optimal printing process of dye-free was PHBA2.0%, acid 18%, steam for 20 min after being printed. Colored and printed tussah fabric reactions occurred in the fabric itself, so the mechanical properties of chromogenic fabric unchanged almost, which had excellent color fastness and levelness.

Analysis of Certain Phenomena in Tussah Silk Dye-Free Coloration

Different color tussah fabric was got applied by dye-free coloration technology. When tussah fabric was treated with p-hydroxybenzaldehyde, red tussah fabric was obtained by coloration directly and two-step for deeper color, and brown color fabric was shown in one-bath coloration. In this paper, some phenomena showing in different processes of dye-free colorations was analyzed.

In Situ Synthesis and Characterization of Nanosize Hydroxyapatite/Polyacrylonitrile Composite Bead

nanosize hydroxyapatite/polyacrylonitrile composite bead was prepared via in-situ synthesis method. Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), particle size measurement and X-ray diffraction (XRD) were used to characterize the HAp/PAN composite bead. XRD curve indicates low crystallinity of HAp. Particle size and SEM analysis demonstrates that decreased partical size of synthesized HAp as well as good distribution with the addition of PAN is found. The HAp is well-distributed and the combination between HAp and PAN is well. FTIR showed that there was no shift of characteristic peaks of synthesized HAp in PAN, which proves the physical interaction between PAN and HAp. The approximate HAp content of 28.6% calculated from thermal analysis curves means high conversion ratio of HAp. The adsorption amount of cadmium ions onto composite beads is lower than HAp particles.

Kinetics and Thermodynamics of Sodium Alginate/Hydroxyapatite Composite Adsorption Fiber for Cd(II) Adsorping

In this study, kinetics and thermodynamics of sodium alginate/ hydroxyapatite composite adsorption fiber for adsorping Cd () were studied. The morphology and structure were characterized by SEM and IR, and the effects of pH value and bath ratio on Cd () adsorption were discussed. The model of adsorption kinetics and thermodynamics were simulated, and the parameters were calculated. The results showed that the sodium alginate/hydroxyapatite composite adsorption fiber possessed good adsorption ability towards Cd (). The optimum adsorption was found at the pH value of 6-7. High removal percent of more than 90% at low concentration and high concentration of Cd () was obtained at the bath ratio of 1:100 and 1:1000, respectively. The adsorption kinetics and thermodynamics studies showed that the pseudo-second-order model and Freundlich isotherm described the adsorption behaviors well. The thermodynamic parameters indicated that the adsorption of Cd () onto sodium alginate/hydroxyapatite composite adsorption fiber was physical and chemical sorption, endothermic in nature.

Optimization on the Preparation of Heat-Resistant Cotton Stalk Bast Fibers Reinforced PLA Composites by Response Surface Analysis

Response surface analysis was applied to optimize the processing of preparing the heat-resistance of the cotton stalks bast fiber reinforced PLA composite. Effects of all factors were evaluated and three factors were selected, which were addition of TAIC, mass fraction of fibers and length of fibers. Subsequently, response surface analysis based on Box-Behnken experimental design was employed to evaluate the interactive effects of three factors. One mathematical model for the processing of composites as functions was established. The results showed that the optimal processing was that the addition of TAIC was 2.1%, the mass fraction of fibers was 26.7%, the length of fibers was 11.7mm, and the HDT of composite was 161.39°C. Under the optimal conditions, the true value was close to the predicted value.

Preparation of 3D Honeycomb Basalt Fibers Woven Composites

The ordinary loom was used to weave different sections of 3D honeycomb fabrics based on the reasonable design of maps and parameters. It could save production cost to ordinary loom used to weave 3D fabrics and controllability of fabrics was good. The fabric was used as enhance phase, 307-3 polyester resin was used as matrix, and VARTM process was used in making 3D honeycomb basalt fibers woven composites. The composites can overcome the shortcomings such as poor integrity, easy to be cracked, low interlaminar strength and easy to be damaged. This study provides theoretical guidance for 3D textile composites.