Advanced Materials Research Vols. 113-116

Abstract: In order to extend the preservation time of the ferrate, the experiment was carried out to study the type of strong oxidizer and buffering agent through static comparing test. The orthogonal test determined the best parameters of sulfate type, temperature and the dosage. The result shows that the inhibitory action of Na2S2O8 is the strongest oxidizer, and the temperature had the important role on ferrate stability. The higher temperature, the quicker the ferrate decomposition speed. The Na2S2O8 effect on stability was the best at any temperature and the dosage of Na2S2O8 could be controlled between 0.5% and 1.0%.The carbonate buffering agent could play certain stable effect, the ferrate decomposition is only 7.65% from the 2nd day to the 10th day when the mole ratio of NaHCO3 and NaOH was 2:1 and the density was the ferrate’s 100times.

Abstract: Anthocyanins are natural colorants which have recently received worldwide attention due to their extensive range of colors, innocuous and beneficial health effects. In this study, anthocyanin pigment isolated from purple hulless barley were subjected to spectral (pH 1~12) and stability analyses (pH 1, 3 and 5). The pigment exhibited red, green or yellow-brown color depending on pHs, and the most reddish (517 nm) and bluish color (582 nm) was around pH 1 and pH 8~9, respectively. The light irradiation and heating (50 and 95 °C) tests indicated that the pigment was more stable at lower pH than at higher pH, and the light and heat could accelerate its color degradation. After 15-day storage under darkness, about 6.8, 7.6, 8.6, 10.4, 11.1 or 17.6% additional anthocyanin residual was respectively observed in the pigment solution (pH 3) in the absence of added 0.25 M KCl, NaCl, CaCl2, MgCl2, ZnCl2 or AlCl3. These results suggested small metal ions, especially highly charged ions had protective effects on storage stability of anthocyanin pigment.

Abstract: Microwave-assisted extraction (MAE) is first used to extract baicalin from Scutellaria baicalensis extractive drug residue to study the value of Scutellaria baicalensis extractive drug residue. The content of baicalin in the Scutellaria baiacalensis extractive drug residue was determined by UV. Effects of different granularity sizes of its extractive drug residue, different microwave output power, duration of microwave irradiation and different concentration of ethanol on yield of baicalin were discussed. The results indicated that the microwave power was 500w, granularity of Scutellaria baicalensis extractive drug residue was 0.25mm, 30% ethanol was as solvent, duration of microwave irradiation was 3min.The　yield of baicalin arrived 9~10%.The conclusion is that some active component such as Baicalin is still in Scutellaria baicalensis extractive drug residue, Scutellaria baicalensis extractive drug residue can be reused as resources again.

Abstract: Food Packaging material requires an excellent barrier ability to humidity and oxygen.SiOx barrier thin film deposited on high polymer substrate can compare beauty with aluminum foil in the barrier quality,even more SiOx barrier thin film is obviously allowing microwave permeating directly and it also provide a chance for merchant to vision their production in shelf life.SiOx film as barrier packaging material is becoming a high light.The current status and research progress of new type high barrier thin film packaging material were overviewed and production technology was introduced. The various influencing factors were discussed, including background vacuum, reactive gases, and pretreatment of the substrate surface and properties.

Abstract: As methods of preparation, many technical such as degradation of lignocellulose materials, organic synthesis, the reinforcement of composites et al. have been introduced into self-bonding technology. According to different treatment, pretreatment methods have been divided into three categories: Physical method, chemical method and biological method. According to different mechanisms, each method is further classified. The types and action mechanism of pretreatment were summarized. Physical pretreatment usually have various degrees impact on the bonding strength but weak controllability, while chemical pretreatment have obvious effect on the bonding strength increased but serious pollution. Biological pretreatment is a promising but immature technology. By comparing the advantages and disadvantages of different methods, Feasibility of combined application of different methods is analyzed. Finally, the development foreground of pretreatment techniques in self-bonding composites is predicted based on the current research.

Abstract: To characterize the combustion behavior of wood-polymer composite (WPC), plain larch wood veneer (PLW), treated with or without fire-retardant FRW, was impregnated in the solution of monomer methyl methacrylate (MMA) and initiator azobisisobutyronitrile (AIBN), then heat-cured by the protection of nitrogen gas, and then analyzed by a cone calorimeter using PLW as control. The results showed that the heat and smoke release of the composites with and without FRW increased with the increase of the polymer loading; that compared to PLW the time to ignition(TTI) prolonged, the distribution region of heat release rate(HRR) of WPC broadened, the total heat release(THR) increased and the smoke ratio(SR) increased; that the FRW treatment of PLW resulted in the significant fire retardation effects to the WPC, which caused decreases in the peak value of HRR, SR and THR.

Abstract: Nanocomposites with high density polyethylene (HDPE)/nanoclay/bamboo flour were fabricated by melt compounding. Their thermal behaviors and degradation kinetics of the composites with different clay contents were characterized through dynamic and isothermal Thermogravimetric (TG) analysis. It was found that the use of nanoclay improved the thermal stability of the composites. The nanolayers could act as a barrier for the degradation of HDPE/bamboo hybrids. The addition of compatibilizer also improved the thermal stability of HDPE/bamboo composites, but the effect was less significant than clay. It seems that there is no much difference in the thermal behaviors between HDPE/nanoclay/bamboo systems with and without the addition of compatibilizer. The activation energy values varied very little for different clay contents in the composites. Thermal decomposition process of HDPE/bamboo composites with various clay additions had similar TG curves.

Abstract: Flake alignment level (FAL) is a primary variable in oriented strandboard (OSB) manufacture that significantly affects the properties of OSB panels such as linear expansion (LE). Realizing the differences of FAL and LE among various OSB manufacturers will help the users have a better understanding of OSB performances in utilization. FAL and LE of various commercial OSB were investigated in this study. FAL was analyzed through percent alignment (PA) proposed by R. L. Geimer. This measures the average angle deviation from a reference angle of 45 degrees to the principal alignment direction of the board. It was found that different OSB manufacturers and even the same company showed significant variations in PA. In general, the front sides of panels had superior PA compared to the back sides. LE of commercial OSB had no clear relationships with PA. So it is hard to predict LE from flake alignment for commercial OSB.

Abstract: With tribasic sodium phosphate (Na3PO4) as electrolytic liquid, to adopt micro-arc oxidation (MAO) prepares titanium oxide films directly on the titanium net surface. In order to improve the photocatalytic activity of TiO2 films prepared by micro-arc oxidation, the titanium oxide films were treated by Sulphuric acid aqueous. The structures before and after surface acid treatment were characterized by XRD, SEM, EDX,and photocatalytic ability of titanium oxide coatings were evaluated by photocatalytic degradation of acid brilliant scarlet dye aqueous solution . It was found out that the titanium oxide films were mainly made of titanium and anatase. The sodium at titanium dioxide/itanium (TiO2/Ti) film surface was reduced after the Sulphuric acid treatment. The photocatalytic activity of the titanium oxide films were enhanced after Sulphuric acid treatment. When Sulphuric acidaqueous concentration is 0.1mol•L-1 and soak time is 18 hours, the TiO2/Ti films photocatalytic degradation rate increased from 15% to 31%.

Abstract: The spatial and temporal distribution of phenanthrene were examined with indoor simulation experiments to study the transportation and transformation of phenathrene in the groundwater aquifer. The result showed that non-point pollution of PAHs is easily formed because of the effects of PAHs pollution’s convection and dispersion along with groundwater. The experiment about relationship between pH, Eh, conductivity and pollution plume of phenathrene revealed that variation trend of pH and conductivity are the same. Yet Eh variation is just contrary as the average rising ratios were 0.194 mv/d and 0.163 mv/d, respectively. The natural attenuation of phenanthrene pollutants in aquifer is obvious for the initial 80 days. The three stages about variation of phenanthrene in groundwater aquifer were slow decline stage (stage I), rapid decline stage (stage II) and stationary stage (III stage). The removal rate of phenanthrene by aquifer is 37.2 %, which adapts to stage II concerning groundwater remediation.