Advanced Materials Research Vols. 476-478

Abstract: Selecting a residence of eastern region of Qinghai province as the research object, the author conducted the test on indoor temperature and relative humidity in winter. Based on the analysis of test data, quantitative assessment was made on residential thermal environment in different passive energy saving measures. The results showed that houses with additional sunspaces or the houses with passive technology can still reach the basic requirement of human thermal comfort even in the absence of heating measures. In the daytime, indoor and outdoor temperature could reach to 21.4 °C. According to the test results, passive energy saving measures should be adopted in house construction in order to adapt to the local climate. This way can effectively improve the local building indoor thermal environment in winter.

Abstract: Combining with Jeffery equation and mechanics model of fixed point of Euler rigid body, research was done to study the mechanism and method of the short fiber radial orientation and characteristics of movement in tread extrusion process. The influence of tension flow field and shear flow field in flow channel on short fibers orientation has been systemically analyzed by flow characteristics of the tread during the extrusion process and combining with Jeffery equation and mechanics model of fixed point of Euler rigid body. The result show that the expansion ratio and the expanding angle of cross section are the key factors to determine the radial orientation of short fiber. Mathematical model of short fiber radial orientation was established. The extrusion die, which has a hinder dam by adopting such principle has been designed. The result also show that the best expansion ratio was 3-4, obtaining the average orientation angle between 70o-80o. and the rationality of the radial oriented mechanism and the mathematical model are verified.

Abstract: Gamma irradiation crosslinking of nylon6 fibers with and without the presence of triallyl cyanurate(TAC) was studied, XRD、DSC、IR and TG were used to analyze the effects of irradiation crosslinking on structure and properties of PA6 fibers. The melt-drip performance of PA6 fibers was improved after irradiation crosslinking. The breaking strength increased first then decreased as a function of absorbed dose, while elongation at break decreased. The melting temperature and crystallinity decreased with increasing the dose. Besides, the onset temperature of degradation fell slightly and the amount of non-volatile residue at 600oC increased as the irradiation dosage increased.

Abstract: Cationic polymethyl acrylate emulsion which was prepared with no soap emulsion polymerization was used in bleached wheat straw pulp as papermaking retention agent. The main influence factors on retention effect, such as dosage of polymethyl acrylate emulsion, pH value of the bleached wheat straw pulp, reaction time after adding the polymethyl acrylate emulsion and stir velocity were discussed in detail. Experimental results showed that optimal application conditions were that first step was adding cationic emulsion which dosage was 0.64% relative to dry fiber, stir velocity was 1400r/min, 90s for reaction, second step was adding anion components which dosage was 0.16% relative to dry fiber, stir velocity was 750r/min, 60s for reaction, pH value was 4.5~5.0. The cationic organic particles system has good retention aid effect which one pass retention was 96.4%.

Abstract: The objective of the present study was to prepare a novel mixed functional cationic exchange copolymer microsphere containing methyl methacrylic acid and sulfonated styrene crosslinked with divinylbenzene. The emulsion polymerization was used to prepare the cationic exchange copolymer microsphere which was characterized by the scanning electron micrograph (SEM) and the fourier transform infrared spectroscopy (FTIR). The release characteristic of the loaded drug i.e. dextromethorphan hydrobromide from the copolymer microsphere was studied under both simulated gastric (pH 1.2) and intestinal (pH 6.8) conditions. The result showed that the drug released from the novel copolymer microsphere depended on the pH of the release media.

Abstract: Three identification methods, the time domain method (TDM)、the conjugate gradient method (CGM)and the pre-treatment conjugate gradient method (PCGM) are employed for moving force identification. Related research shows that the PCGM have higher identification accuracy and robust noise immunity as well as producing an acceptable solution to ill-posed cases to some extent when they are used to identify the moving force. However, the pre-treatment matrix is very important to the PCGM because it affects the identification accuracy and robust noise immunity as well as ill-posed cases to some extent. The theory study results are practical significant to selection properly pre-treatment matrix.

Abstract: Gelatin microspheres (GMSs) prepared by the inverse suspension cross-linking reaction, was characterised by scanning electron microscopy. The influence of pH on kinetics and mechanism was verified. The kinetic models such as pseudo-first-order, pseudo-second-order and intraparticle diffusion models were selected to understand the reaction pathways and mechanism of adsorption process. Adsorption of food red 7 (FR7) and food yellow 2 (FY2) onto GMSs occurred by chemisorption. For both dyes, adsorption occurred by film and intraparticle diffusion, and the pH increase caused an increase in film diffusion resistance. The biomass GMSs had a substantial potential for removing food dye from wastewater owing to great adsorption capacity and adsorption rate to dye.

Abstract: Abstract. Expanded graphite (EG) was prepared through high-temperature oxidation using natural flake graphite (NG). The curing system of epoxy resin (EP)-low molecular weight polyamide (LPA) was modified with expanded graphite. The mechanical property, thermal stability and electrical property, micro-structure and micro-morphology characterization of the curing system EP-LPA/EG were studied. The results showed that impact strength and thermal stability of the EP-LPA/EG increased with the addition of expandable graphite. Expandable graphite lowers the electrical resistivity of the complex curing system. SEM analysis indicates that expanded graphite dispersed homogeneously in the EP-LPA/EG curing system. The existence of EG made the curing system taking on loosen multiporous structure, and increased the interface effect of the EP-LPA/EG systems.

Abstract: An high-performance water-based drilling fluid is a hot subject of research both at home and abroad in recent years. In this paper, the inhibition property and the influence of amino polyols AP-1 and aluminum polymer DLP-1 on drilling fluid properties were evaluated, on this basis, through the formula optimization, the high-performance water based drilling fluid was developed and and field applied. Both laboratory study and field application showed that aluminum polymer can reduce viscosity and filtration rate, and can effectively inhibit the hydration expansion of clay. Amino polyols had a little effect on the viscosity, gel strength and filtration of drilling fluid, but it had a good shale inhibition. This drilling fluid has good properties in rheology, filtration, inhibition and anti-contamination, with a satisfactory overall performance, which is helpful in solving wellbore instability that are due to unenven hydration or well developed micro fractures.

Abstract: A water soluble branched polyacrylamide has been synthesized through solution polymerization. The polymerization was initiated by potassium diperiodatocuprate, K₅[Cu(HIO₆)₂](Cu(III)), in alkaline medium and capable of initiating the self condensation vinyl polymerization of acrylamide monomer. The polymer obtained was characterized using Fourier-transform infrared (FTIR) spectroscopy and nuclear magnetic resonance (NMR) spectroscopy. Its flocculation properties were evaluated with clay suspensions using standard jar tests. The concentration of monomers, concentration of initiators, reaction temperature and solution pH on the influence of intrinsic viscosity and flocculation properties of production were studied. The results demonstrate that the branched polymer can be used as a kind of novel flocculant in water and wastewater treatment.