Chun Yan Wei

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.

Preparation and Mechanical Properties of Cotton Stalk Bast Fibers Reinforced Polypropylene Composites

The cotton stalk bast fibers are a new kind of natural cellulose fibers, which have the similar properties as the flax fibers. Polypropylene (PP) is a type of matrix material and commonly used in composites. The cotton stalk bast fibers as reinforced materials and PP as matrix were used to make a new kind of composite in the experiment. The composites were prepared by mixing, molding and cold forming. Orthogonal experiment table including mass fraction of fibers, molding temperature, molding pressure and molding time was devised. Then the flexural strength, tensile strength and impact strength were tested and the analysis of range was done. The optimal processing condition was obtained as follows: mass fraction of fibers was 30%, molding temperature was 190°C, molding pressure was 12MPa and molding time was 480s. The result showed that the cotton stalk bast fibers reinforced PP composites had good mechanical properties.

Kinetics and Thermodynamics of Cd(II) Sorption onto Sodium Alginate/Poly(Vinyl Alcohol)/Hydroxyapatite Composite Fiber

In this paper, the sodium alginate (SA)/poly (vinylalcohol)(PVA)/hydroxyapatite (HAp) fiber was prepared via solution spinning. The adsorption properties of SA/PVA/HAp composite fiber were studied,and the adsorption kinetics and isotherms were investigated. The experimental results showed that the adsorption process was fast, in which half-equilibrium and equilibrium was obtained in 5 and 30 minutes, respectively. The pseudo-second-order kinetic model provided a better correlation of the experimental results. Both of Langmuir isotherm and Freundlich isotherm could describe the adsorption behavior of SA/PVA/HAp composite fiber towards cadmium. The positive H° value and increased absolute value of the G° with temperature indicate that high temperature is good to the adsorption process.

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.

Preparation and Mechanical Properties of Cotton Stalk Bast Fibers Reinforced Polylactic Acid Biodegradable Composites

The cotton stalks bast fiber was a new kind of natural cellulose fiber, the fibers had the similar properties as the flax fibers. Polylactic acid (PLA) is a class of biodegradable matrix material. As the flax fibers can be reinforced materials and then compounded with PLA, cotton stalks bast fibers as reinforced materials and PLA as matrix were used to make a kind of green and biodegradable composite in the experiment. The composites were prepared by mixing, molding and cold forming. Orthogonal experiment table including length of the fibers, mass fraction of PLA, molding temperature and molding pressure was devised. Then the tensile strength, flexural strength and impact strength were tested and the analysis of range and variance was done. The optimal processing condition was obtained as follows: length of the fibers was 6mm, mass fraction of PLA was 75%, molding temperature was 175°C and molding pressure was 12MPa. The result showed that the cotton stalks bast fibers reinforced PLA biodegradable composites had good mechanical properties. Through this study waste cotton stalks basts were turned into useful resources and provided a kind of environmentally friendly composites.

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.

Operation Parameters of UV Photografting of Modified Reactive Dye with 2-Methyl-3-Buten-2-Ol onto Cotton Fabric

The clean dyeing of cotton fabric was realized using UV-induced photografting of modified reactive dye. The reactive dye was interacted with 2-methyl-3-buten-2-ol to introduce C=C double bonds. The modification conditions of reactive dye were discussed. The dyed cotton fabric was measured by color difference, scanning electron microscope(SEM),and attenuate total reflection Fourier Transform infrared(ATR-FTIR). Under the conditions of pH value of 8, C.I. reactive red dye 198/2-methyl-3-buten-2-ol mole ratio of about 1:3, interaction time of 40 min, interaction temperature of 70°C, and dye concentration of 40g/L,good color depth of cotton fabric was achieved. The results of SEM and ATR-FTIR verified the occurrence of graft polymerization.

Fabrication and Properties of Corn Husk Fiber / Polylactic Acid Fiberboard

In this study corn husk used as raw material, and achieved corn husk fiber through degumming properly. Then degradable fiberboard can be obtained with husk fiber and polylactic acid particles through blending and hot pressing. Taking mass fraction and length of corn husk fiber, hot-pressing time and temperature as factors, and taking tensile, bending and impact strength as index, through the L9 (34) orthogonal testing and range analyzing and achieved the optimal process parameters is: corn husk fiber mass fraction is 50%, corn husk fiber length is 10 mm, hot pressing time is 6 min, hot pressing temperature is 180 °C. Under the optimal process condition, a optimal fiberboard is obtained, whose tensile strength is 69.32 MPa, bending strength is 90.26 MPa, impact strength is 18.5 KJ/m2. The conclusion of this paper provides the theoretical guidance for the reuse technology of corn husk fiber.