Advanced Materials Research Vols. 332-334

Abstract: The non-isothermal crystallization behaviors of poly (trimethylene terephthalate) (PTT), poly (trimethylene terephthalate-co-isophthalate) (PTTI) and poly (trimethylene terephthalate isophthalate-co-polyethylene glycol) (PTTI-PEG) were investigated using Differential Scanning Calorimetry (DSC). The experimental results showed the crystallization temperature of PTT, PTTI and PTTI-PEG increased when the heating rate increased, and the Avrami exponents n of PTT, PTTI ranged from 3.5 to 5.5, and it was assumed that the non-isothermal crystallization mechanism for PTT and PTTI was the combination of homogenous and heterogeneous nucleation. However, the n value of PTTI-PEG was below 2.5, and the non-isothermal crystallization mechanism was ascribed to heterogeneous nucleation different from that of PTT and PTTI. The activation energy of PTTI increased with the IPA ratios increasing, and the activation energy of PTTI-PEG was the highest, suggesting that the crystallization rate was more sensitive to the temperature in comparison with PTT. Therefore, it was of great importance to control the temperature in processing.

Abstract: Polyphenylene sulfide (PPS) fiber is a kind of high-performance fiber. This paper aimed at investigating the acid resistant performance of PPS fiber. The corrosive action of PPS fiber in nitric acid (HNO3), sulfuric acid (H2SO4), hydrochloric acid (HCl), the mixture of HNO3 and HCl, the mixture of HNO3 and H2SO4, the mixture of HNO3, H2SO4 and HCl were researched. In addition, the influence of various acid concentrations on the performances of the PPS fiber was also studied in the paper. The acid-treated sample was analyzed by the fiber tensile instrument, the Fourier infrared spectrometer, and the scanning electron microscope (SEM) to observe the change of mechanical performance, configuration and appearance.

Abstract: According to the main features of many switch signals, very strict logical waves, complex electromagnet interference in the weaving machinery, the embedded design scheme based on SoC technique is employed. The consideration of designing a universal electrical control system for weaving machinery based on SoC and FPGA is presented by making full use of the internal structure and the resource configuration. In accordance with the characteristics of weaving machinery, the proposed design methods are applied in the control system of glove knitting machinery. The typical structure and the partial electromagnet waveforms are provided. The practical application shows that the peripherally hardware circuits and the control programs are simplified in the embedded control system based on SoC technique. The reliability of the whole equipment is rapidly improved. This system can be widely applied in weaving machineries.

Abstract: In this paper, we use pure cotton yarn and cotton/coconut carbon blended yarn to develope interwoven fabric of different weave and different coconut carbon fiber content. We set up the experiment device which can test the adsorption performance of formaldehyde and use it to test the fabric, discuss influence of the time, weave and coconut carbon fiber content on the fabric's adsorption performance .

Abstract: This Research Is to Study the High Strength Polyester Fabric Pre-treatment by Oxygen Plasma and Far-infrared, in the Rfl Chemical Solid Composition and Methylenediphenylisocyanate Concentration of 4% for Adding. Analysis Adhesion Strength between Fabric to Fabric and Fabric to Rubber of the Conveyor Belt, and the Effect of Pet Fabric Mechanical Properties. from the Result, the Best Treatment Condition Is Oxygen Plasma Treated 1min 120w and Add 4% Methylenediphenylisocyanate(mdi). in the Adhesion Strength of Fabric and Fabric Layer Compared with the Untreated Has Raised up to 21.5kgf (25.0%), and Fabric and Rubber Layer Has Raised up to 23.7kgf (55.9%). Heating 20 Seconds, after Stop 10 Seconds and then Heat 20 Seconds and Add 4% Methylenediphenylisocyanate(mdi) Fabric-fabric Adhesion Strength Is 13.4 Kgf, Fabric-rubber Adhesion Strength Is 15.8 Kgf, Fabric-fabric and Fabric-rubber Adhesion Strength that Improve 24.1%, 43.6%.

Abstract: T-400 is an elastic fiber developed by Dupont. It was commended as one of the best developing prospect chemical fiber in the 21 century. In this paper, the elasticity of spun silk/T-400 interlaced fabric was studied. The elastic characteristic of the spun silk/T-400 interlaced fabric with different warp density, weft density, fabric intensity and fabric weave were tested and analyzed. And the stress relaxation was studied. It shows that elastic reversion at certain elongation of the fabric is correlative directly with the warp density, weft density, intensity and weave. The elastic reversion at certain elongation decreased following the warp density and weft density increased. And it was increased following the ratio of weft intensity to warping intensity and the fabric average float increased. The time of stress relaxation is longer if the warp density is larger. The time is shorter when the warp density and the fabric average float is larger. And the correlative curve was pictured and the correlative formula was built.

Abstract: In order to realize the parametric design of the conjugate cam beating-up mechanism, on the basis of the technological parameters of beating-up mechanism, ideal kinematical curves of the beating-up mechanism are builded, and the mathematical model of reverse solution for this mechanism is established. The parameters of this beating-up mechanism are obtained by reverse solution according to the kinematic requirements and the constructed ideal kinematic curves. The secondary development of UG is conducted based on VB.NET, the parametric design platform which is integrated with the functions of parametric reverse solution, motion simulation, three-dimensional modeling and virtual assembly is built. After entering the technological parameters of beating-up and essential structural parameters by users, the three-dimensional drawing of main parts such as the conjugate cam and shaft, can be obtained by this platform, also the processing data of the cam can be calculated. This platform provides a rapid approach for the parametric design of beating-up mechanism.

Abstract: 1-Butyl-3-methylimidazolium chloride ([BMIM]Cl) was applied as solvent to dissolve the cellulose diacetate (CDA) directly. The solution rheology of CDA in [BMIM]Cl was investigated by steady shear and oscillatory shear measurements. In the range of the concentration and temperature studied, CDA/[BMIM]Cl solutions showed the typical shear-shinning behavior and the viscosity decreases with increasing temperature. Compared with the cellulose solutions in [BMIM]Cl, the smaller apparent viscosity of CDA/[BMIM]Cl was shown, which mainly resulted from the weakened interaction between substituted cellulose chains and ionic liquid. The deviation of Cox–Merz rule with steady shear viscosity smaller than complex viscosity in the whole deformation rate range we studied indicates that entangled CDA/[BMIM]Cl solutions are not homogeneous solution systems.

Abstract: In this paper, Wide Angle X-ray Diffraction (WAXD), Small Angle X-ray Scattering (SAXS), Dynamic Mechanical Analysis (DMA) and mechanical testing were employed to characterize the effect of heat treatment under constrained condition on poly(ethylene terephthalate) (PET) fiber. The microstructure and property of the PET fiber with moderate tenacity changed with the heat treatment temperature from 110 °C to 190 °C. No change happened in the crystalline phase while the micro-crystal formed in the amorphous phase from the result of crystalline parameters, which led to the increase of T_g of the fiber. The decrease of the tenacity is due to the decrease of the amorphous orientation and the decrease of the long period leads to the increase of the stability of the fiber.

Abstract: In this study, composite nanofibers of polyaniline doped with dodecylbenzene sulfonic acid (PANI-DBSA) and Poly(lactic acid) (PLA) were prepared via an electrospinning process. The surface morphology, thermal properties and crystal structure of PLA/PANI-DBSA nanofibers are characterized using Fourier transform infrared spectroscopy (FT-IR), wide-angle x-ray diffraction (WAXD) and scanning electron microscopy (SEM). SEM images showed that the morphology and diameter of the nanofibers were affected by the weight ratio of blend solution.