Xu Pin Zhuang

Structure and Thermal Properties of Cellulose Diacetate-Graft-Poly(lactic Acid) Copolymer

To improve the thermal behavior of cellulose diacetate, cellulose diacetate-graft-poly(lactic acid) copolymers (CDA-g-PLAs) were synthesized by ring-opening polymerization of L-lactide using stannous octoate (Sn(Oct)2) as catalyst. The molecular structure of the copolymer was characterized by FT-IR and 1H-NMR and the thermal properties were investigated by differential scanning calorimetry (DSC) and thermogravimetric analysis (TG-DTA). The results showed that the product was grafted copolymer of cellulose diacetate-graft-poly(lactic acid) with different side-chain structure. The thermal processing properties of CDA-g-PLAs are remarkably improved with melting temperature(Tm) about 140°C which lower than that of CDA and decomposition temperature (Td) higher than 260°C.

Electrospun Antibacterial Chitosan/Poly (Vinyl Alcohol) Nanofibers Containing Silver Nanoparticles

New chitosan/poly (vinyl alcohol) (PVA) nanofibers functionalized with silver nanoparticles were electrospun using solutions of PVA blended with silver nanoparticles-chitosan composites. The structure of the electrospun fibers were studied with the aid of scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. The results indicated that the electrospun fibers smoothly with 220 to 650 nm diameter, and the silver nanoparticles were successfully embed into the fibers which show high antibacterial activity against E.coli.

Study on Raman Spectra of the Polyacrylonitrile Iron Complex Nanofibers

We have measured the Raman spectra of all samples in the process of preparing polyacrylonitrile (PAN) iron complex nanofibers, and compared their Raman spectral characteristics, and thus gained a preliminary result for the PAN nanofibers structural changes in the different stages. Through its Raman spectral analysis and comparison we can find that the cyano group (C N) of modified PAN nanofibers disappeared while the Raman bands of C = N group appeared. For the pre-oxidized PAN nanofiber, because the D and G bands of the C = C vibration appeared in the Raman spectra, it is concluded that the PAN nanofiber has an apparent structural change. Finally, it is also found that that Fe3+ and O2- ions have formed coordination bonds in the further prepared PAN iron (Fe3+) complex nanofibers because the characteristic Raman band of Fe = O bond appears.

Preparation and Properties of PP Melt-Blown Nonwoven Wadding Blended PET Crimp Fibers

Polypropylene (PP) melt-blown nonwoven has a good performance on thermal insulation, but it easily can be compressed tightly and hard to recovery. In this paper, to improve the disadvantage, we blended PET crimp short fibers into PP melt-blown nonwovens. Results showed that polyester (PET) crimp short fibers blended in melt-blown nonwovens supported as skeleton, effectively improved the bulkiness and compression-resisting performance of productions, as well the warmth retention properties.

Sound Absorption Properties of Polyester Fibers Needle-Punched Nonwoven Fabrics

Polyester fiber needle-punched nonwovens with different structures were manufactured and their sound absorption properties were examined using the standing wave tube method. The results show that the sound absorption property of the nonwovens depends on their thickness, needling intensity, fiber diameter and surface structure.

Theoretical Calculating Acoustical Absorption Coefficient of Nonwoven Fabrics

Nonwoven fabrics possess good acoustics properties and are used widely in many fields. Based on the Zwikker and Kosten theory, this paper suggests a numerical method for calculating their acoustical absorption coefficient.

Research on Properties of Aramid Fiber Needle-Punched Nonwoven Fabrics

Aramids fibers are among the best known of the high-performance, synthetic, organic fibers. Needle-punched nonwoven fabrics with various structures were manufactured and their physical properties, structure, thermal insulation property and acoustic absorption property were examined. The results show that the aramid fiber needle-punched nonwoven fabrics possess good performance at thermal and acoustic insulation besides light mass and inherent flame-resistant.

Study and Application of Nano Antibacterial Technology on Nonwoven Materials

The paper expatiates the nano material application on the nonwoven field and we carry on antibacterial test to the nonwoven fabric. All of these show that nano technology combine with nonwoven industry will have a great potential for widening product application field and promoting product overall performance, will create huge economical, social benefit on nonwoven industry in the future.

Morphology of Biodegradable Poly(hexamethylene Adipate)(PHMA) Nanofibers Prepared by Electrospinning

A kind of novel biodegradable poly(hexamethylene adipate) (PHMA) nanofibers with diameter of 100～700nm using a mixed solvent of 1,2-dichloroethane (DCE ) and trifluoroacetic acid (TFA) were obtained by electrospinning process in this paper. The morphology of electropun PHMA nanofibers were investigated by scanning electron microscopy (SEM). The results showed that the morphology, diameter and uniformity of the fibers were influenced by solvent ratio, solution concentration, applied voltage, capillary–screen distance and flow rate greatly. The finer and uniform nanofibers were electrospun from a mixed solvent of DCE and TFA with ratio of 70/30(w/w).