Advanced Materials Research Vols. 332-334

Abstract: Abstract:Kaolin masterbatch was prepared first, and then three kinds of kaolin modified polyester fibers (100 dtex) which respectively contained kaolin masterbatch 2%(PK2), 4%(PK4), 6%(PK6) were successfully spun. Properties of kaolin modified fibers were discussed. The results showed that kaolin particles were evenly dispersed in polyesters. Breaking strength and Young’s modulus of the kaolin modified fibers were decreased with the increase of the kaolin content; moisture absorption was increased with the increase of the kaolin content; boiling water shrinkage was decreased with the increase of the kaolin content; and kaolin modified polyester fibers have good performance of ultraviolet resistance.

Abstract: A diacid monomer was prepared from trimellitic anhydride and aminobenzoic acid,and a novel poly(ester-imide) was synthesized through the diacid monomer and the 1, 4-butanediol.The structure and chemical resistance, intrinsic viscosity and thermal property and crystallization of the poly(ester -imide) were characterized by FT-IR spectra,various organic solvents,a capillary Ubbelohde viscometer,differental scanning calorimetry (DSC) and thermogravimetric analysis (TGA) and crystallization rate instrument.The results showed that the poly(ester-imide) has excellent chemical resistance and thermal property,its intrinsic viscosity is 0.46dL/g,it has high glass transition temperature (Tg) and relatively low melting temperature (Tm).Moreover,the novel poly(ester-imide) has obvious crystallization and excellent property to spin into fibers.

Abstract: In this work, polyacrylonitrile (PAN) with nanoporous structures were successfully prepared via electrospinning technique. For the preparation of porous PAN nanofibers, two kinds of polymers of PAN and polystyrene (PS) were used as electrospun precursor materials, and then the bicomponent nanofibers of PAN and PS were extracted with chloroform to remove the PS in the composite polymer nanofibers. Electrospinning of PAN with 0-50% w/w at a 15% w/w total concentration in N, N-dimethylformamide produced fibres with decreasing averaged diameters from 500 to 1500 nm. Evidence of phase separation between PAN and PS in the bicomponent fibres was indicated by the characteristic PAN and PS peaks by Fourier transform infrared (FTIR) spectroscopy

Abstract: The PET/PTT self-crimp filament appears obvious crimp elasticity under appropriate finishing conditions. The paper discusses the properties and structures of the PET/PTT filament at different temperatures. With the rising treatment temperature, the shrinkage of PET/PTT fiber increases, while its crimp elongation decreases; both the sonic orientation factor of PET/PTT fiber and the crystallinity of PET and PTT component in PET/PTT fiber decrease. The sonic orientation factor of PET fiber and PTT fiber decrease, their crystallinity increases with the rising treatment temperature. The decrease of the crystallinity of two components makes the orientation lower, which leads to the results that the length of the fiber shrinks and the shrinkage is higher than the crimp shrinkage from the shrinkage difference of two components.

Abstract: In this Study, Visible on the Far-infrared Emissivity of Knitted Fabric, its Rate of Change of Far Infrared Radiation Were Observed. in this Study, Light Exposure Time for 20,40,60 Minutes, the Experimental Results, the Longer the Kind of Light Source Distribution Is much Higher Surface Temperature Will Be Relatively Higher Rate of Infrared Radiation, when the Light Source when the Suspension Began Measuring Data, the Light Source, the Far Infrared Radiation Rate of about 0.941 ~ 0.975 when Reached Will Begin to Flatten, after 15 Minutes Returned to its Emission Rate of about 0.937, when the Far-infrared Light Irradiation of Polyester Fabrics through the Far Infrared Radiation Values Are Effectively Increase, so the Light Irradiation Intensity of Far Infrared Radiation Rate of the Subjects Were Characterized by Light and the Length of Time to Improve the Fabric Surface Temperature Change and this Temperature Rise Is the Key to the Experimen

Abstract: Based on melt spinning dynamic model and theory, a basic model of superfine denier polyester multifilament was established. Besides the expressions of quench air temperature and quench air velocity for superfine denier filament spinning process have been established in this paper. In different conditions of diameters of spinneret holes, spinning temperature and the quenching process, the degree of orientation, crystallinity and spinning stress of polyester filament in the spinning process was simulated, respectively. The variation of quench air temperature and air velocity of multifilament in different circles of spinneret was mainly discussed. The research was expected to provide basic theory for optimizing production technique and manufacturing high quality superfine denier polyester filament.

Abstract: Mechanism controlling longitudinal movements of guide bars in a warp knitting machine is still employed in many factories in China. But it is use a lot of time in order to change the type of fabrics. This sort of mechanism is gradually replaced by stepping motor that controlled by microcomputer. So, it is need to send data that guide bar need to move from computer to microcomputer. A circuit of transmission data is designed. The serial communication uses port of RS232C and potential convertor MAX232ACPE without model. There are use only three lines of RXD, TXD and GND of the serial communication port in the microcomputer (80C51). The protocol of transmission data is programmed. The serial communication baud rate at 2400 is set. The data that control movement of guide bars can be transmitted rightly.

Abstract: In the paper the structure of the compact spinning with pneumatic groove is introduced and the characteristics of three-dimensional flow field of the compact spinning with pneumatic groove are also investigated. Results from this research confirmed that In the compact zone, the air flows to the groove and enters the inner hollow of the slot-roller through the round holes, and the air on both sides of the groove condenses to the center of it and flows to the round holes; It is beneficial to compact the fiber and make the fiber slip to the bottom of the groove with shrink shape; the velocity and negative pressure are both not homogeneous, as the round holes are not continual, and the gradient of static pressure and velocity in compact zones are also perceptible.

Abstract: In this paper,antistatic property of PAN/PANI composite fiber was studied through the grafted polymerization of Polyacrylonitrile and Polyaniline (PANI). The preconditioning and the dosage of ANI influenced on the rate of bodyweight gain, breaking strength and tensile rate,mass specific resistance of the composite fiber were discussed. The mass specific resistance of conventional polyacrylonitrile fiber is 1011Ω•cm,the mass specific resistance of PAN/PANI composite fiber could be reduced to 106-108Ω•cm. It could prove that the antistatic property of PAN fiber has been greatly improved by PANI.

Abstract: Rheological properties of blend spinning solution of sodium alginate and carbon black (SA/CB) were investigated. The results reported that blend spinning solutions were non-newtonian fluids. The apparent viscosity and structural viscosity index increased with increasing CB content in SA spinning solution, but the non-newtonian index decreased, both demonstrated the blend solution was sensitive to shear rates. Blend spinning solution with 6% CB had large flow activation energy (Eη), so the temperature must be controlled exactly in spinning. Temperature had similar impact on sample spinning solutions: the apparent viscosity decreased when it increased. Study on dynamic rheological behavior shows SA/CB blend spinning solutions had greater die swell ratio and worse flowability than pure SA solution, but the flowability of blend solutions could be regulated by changing temperature.