Advanced Materials Research Vols. 332-334

Abstract: In this paper anti-bacterial fiber, anti-bacterial fabric and antimicrobial clothing were combined organically. In order to study the nature of antibacterial clothing, the antibacterial mechanism of anti-bacterial fiber and anti-bacterial fabric was stated; the latest situation and processing method of anti-bacterial fiber and anti-bacterial fabric was summarized; finally the application prospect of anti-bacterial cloth was explained.

Abstract: This paper designs a type of small artificial blood vessel in a composite structure, which the nano cellulose coating is attached to the tube blank. The properties of this type of artificial blood vessel - radical and axial tensile property, area of aperture gaps - are observed by an electron microscopy and analyzed to prepare for the further experiments.

Abstract: Effect of substrate conditions, including material type, thickness and radius of substrate, on thermal-shocking stresses of plasma spraying Sm2Zr2O7/YSZ TBCs was analyzed through finite element method. Results show that radial stresses decrease with time increasing, and they decrease with the increasing of distance from center to edge along radius. However, axial residual stresses increse abruptly at the edge of specimen. All residual stresses increse with incresing of thermal expansion coefficient of substrate. Radial stresses increase with substrate thickness increasing, however, they are not effectd by substrate thickness if it is great than 25mm.and axial residual stresses and shear stresses are not effected by the substrate thickness. The maximum values of axial stresses and shear stresses were not effected by sustrate radius. and values of radial stresses remian invariable when substrate radius is over 18mm.

Abstract: The different organic montmorillonite (OMMT) orientation HIPS/OMMT nanocomposites were prepared through the melting intercalated method and second produce. The flame retardancy of the two composites was evaluated by the Cone calorimeter. The structure of burnt residues was observed by digital camera and scanning electron microscope (SEM). The experimental results show that the Heat Release Rate (HRR) and Mass Loss Rate (MLR) for horizontal orientation HIPS/OMMT nanocomposites are lowed in comparison with the vertical orientation composite. The burnt residue of horizontal orientation HIPS/OMMT nanocomposites has a continuous skin layer and three-dimensional texture cellular layer under the skin layer after burning. This kind of structure of char residues has a great effect on the flame retardancy of the composites. While vertical HIPS/OMMT nanocomposites do not formed the continuous skin layer, and the voids in char layer are vertical, which provide the passage for flammable gas, and its flame retardancy is not good.

Abstract: In this work, Strontium Titanate samples were synthsized by self-propagating high-temperature synthesis (SHS). Sr2+ directly took part in the synthesis process. As a result, immobilization limitation issue is basically resolved. The Strontium titanate was characterized by crystal structure, dense properties, leach rate, microstructure and scanning electron microscopy. And the synthesis process is feasible in technology and economy. It can be concluded that the strontium titanate synroc is a perfect material to immobilize HLW.

Abstract: In order to control digitally the print-through, the print-through standard of offset printing was studied in this article. For 4 given paper samples, the paper properties including paper opacity and K&N ink absorbency were tested, and then print-through value expressed with ΔD and ΔEab* was measured under 9 sets of printing condition. The results showed that lower printing press and higher printing speed were helpful to reduce the print-through. And under the same printing conditions, the print-through value of cyan ink print was slightly larger than that of magenta ink print. In addition, the print-through values of offset paper samples were a bit larger than that of newsprint samples. In particular, no matter what kind of conditions were, the print-through value expressed with ΔD and ΔEab* were lower than 0.04 and 4NBS when the PTR value was larger than 72%. The standard of print-through was firstly given, which was very helpful to choose paper during the offset printing.

Abstract: In this paper, super absorbent polymer was prepared through graft copolymerization by cellulose and acrylic acid (AA), acrylamide (AM), and butyl methacrylate (BMA) and its properties were determined. It showed that optimum reaction condition is the amount of cellulose, AA, AM and BMA is 10g, 4.5g, 2g and 1.5g respectively, the amount of initiator (potassium persulfate) and N,N'-methylene bisacrylamide is 0.01g and 0.012g, the pH value of AA after neutralization is 7. The water absorbency to distilled water, tap water and salt solution of super absorbent polymer which was prepared under these conditions is 770g/g, 113g/g and 86g/g respectively. The water retention rate of super absorbent polymer gel drops to 3% needs 130 hours under natural condition. It was expected that super absorbent polymer can be used for preservation processing of fruits.

Abstract: Based on the creep testing results of geogrids, a three-parameters viscoelastic constitutive model of the geogrids is established, and their applicabilities and reliabilities are evaluated by using the utmost optimization theory. It is illustrated that the three-parameters viscoelastic model of geogrids established can relatively accurately reflect the two-stage attenuation creep properties of geogrids at a low stress. Then, a constitutive model of reinforced soil considering viscoelasticity of geogrids is established, and the constitutive model parameters of reinforced soil are solved based on the utmost optimization theory. Finally, the variation regularities of stress-strain characteristics of reinforced soil with the changes of different influencing factors is studied.

Abstract: The microgels with semi-interpenetrating polymer network (semi-IPN) structure based on cross-linked poly(N-isopropylacrylamide) (PNIPAM) and linear poly(acrylic acid) (PAA) were fabricated by one-step precipitation polymerization technique. The chemical composition of the microgels was determined by Fourier transformation infrared spectroscopy and elemental analysis. It was found that the PAA content inside the microgels decreased as the pH value of reaction media increased. The semi-IPN structure of the microgels was confirmed by transmission electron microscopy using uranyl acetate staining method. The pH dependent hydrodynamic diameters obtained by dynamic light scattering revealed that these microgels can reversibly shrink and swell in the pH range from 4.0 to 6.0. The semi-IPN microgels synthesized at pH 3.0 could undergo about 120 times volume change in the pH range.

Abstract: Dialkoxysubstitued thiophene monomers were synthesized by the nucleophilic substitution and transetherification reactions. Electrochemical homopolymerization of 3,4-dioctyloxythiophene (DOOT), copolymerization of 3,4-dimethoxythiophene (DMOT) with DOOT were carried out via potentiodynamic and galvanostat methods in the supporting electrolyte. The polymers were characterized via cyclic voltammetry (CV), scanning electron microscopy (SEM), gel permeation chromatography (GPC). In the polymerization process, the electroactive copolymer was formed on the electrode surface with the Eonset(ox) at 970mV, which is 20mV higher than that of DOOT. The Eredox of the copolymer was approximately 15mV higher than that of POOT. The momorphology studies indicated that the electrochemical deposition of P(DMOT-co-DOOT) proceeds via a mechanism of nucleation and two-dimensional (2-D) growth.