Advanced Materials Research Vols. 821-822

Abstract: Incineration technology were studied in order to investigate the feasibility of incineration technology on disposal of the arsenic-containing hyperaccumulator Pteris vittata L,The muffle furnace experiment examined the changes of arsenic in fresh and withered leaves of P. vittata L.There are different temperature such as 200 °C, 400 °C, 800 °C three temperature gradient in the incineration experiment,which research the quality and volatilization of arsenic under the different temperature . The results showed that the plant quality reduced accompanied by the volatilization of arsenic was raised with the increasing of temperature . P.vittata L had maximum mass loss and the least volatile of heavy metal after burning treatment at 400 °C . The result provides insight into developing harmless disposal or resource-reuse-oriented methods for disposal of the plants used for large scale phytoremediation application. Key words: Hyperaccumulator; Incineration; Pteris vittata L.; dispose

Abstract: The cassava starch was firstly hydrolyzed using hydrochloric acid as the catalyst below the pasting point of starch, and then dried in the oven in order to get acid-hydrolyzed cassava starch, which would be used for the next size mixing. Effects of reaction time, temperature, and hydrochloric acid concentration on sizing liquor viscosity of acidolysis cassava starch were studied. The results show that, the viscosity of the acidolysis cassava starch decreases with the extension of reaction time, and it sharply declines before 60mins; the viscosity decreases with the increase of reaction temperature, and the change of viscosity is large when the reaction temperature of 40 °C increases to 45 °C; the viscosity decreases with the increase of hydrochloric acid concentration.

Abstract: Taking cassava starch as the raw materials and hydrochloric acid (HCL) as the catalyst, the acidolysis modification of starch was performed combining with the size mixture blending process. The results show that when the concentration of cassava starch is in the range of 8%~12%, the dosage of 6% hydrochloride acid for 1000g starch milk is about 0.8g~1.2g, and the viscosity of acidolysis starch decreases with the increase of hydrochloric acid dosage. The viscosity can reach the stable level when the reaction time is about 2 hours for the size mixture of low viscosity, and is about 3 hours for that of the high viscosity. Also, the viscosity thermal stability of size mixture is verified to be good.

Abstract: Biomass has attracted keen interest as a renewable resource and an environmental friendly material that is essential to realize a sustainable world. Lignin as biomass has been long labeled with waste material. But now the innate chemistry of lignin and a phenolic heteropolymer, has allowed it to make inroads into the high value polymer and natural biomass material industries. Supercritical fluids (SCF) have been shown to be a promising technique for future large-scale biofuel and base-chemicals production, especially for depolymerization production from lignin. This paper reviews the research progress of lignin-depolymerization processes, including effects of process parameters, such as reaction time, temperature, pressure and catalyst, product analysis, and reaction mechanism with different supercritical fluids. The problems of depolymerization with supercritical fluid technology and its development direction are also briefly discussed. Compared with conventional lignin production methods, the SCF technology processes of lignin can produce smaller fragments through breakage of the ether linkages and produce larger fragments through cross linking between the reactive fragments, and the depolymerization lignin processes are typically conducted at mild operating conditions, and the monomeric products have a high economic value because the aromatic products can be readily blended into current transportation fuels or used in chemical industry.

Abstract: This paper presents methods of cushioning package design. The analysis of existing shortcoming is made when the maximum accelerationstatic stress curve (what is called curve) is applied to the cushion package design, at the same time ,the principle and method steps to get curve are briefly introduced when the stressenergy method is used .the function between the key parameters of cushioning package design is acquired by the stressenergy method .By comparing the data produced with matlab software with the real experimental ones in some paper, the possibilities to get curve of casual drop height and cushion thickness by one-time experiment to get curve with stress-energy method is demonstrated. Based on the function of key parameters of cushioning package acquired, the reversed cushioning package design method is carried out.

Abstract: To improve the strength and toughness performance of PVC, the resin reinforced with magnesium borate whiskers (MBO_W ) were prepared by mixing whiskers into liquid PVC at room temperature. The effects of borate coupling agent (SBW-III) and contents of MBOw (0~30wt%) on tensile of PVC and composites were studied. The compatibility, hydrophilicity and morphology of MBOw/PVC composites were characterized by Fourier transform infrared spectroscopy ( FTIR), surface contact angle measurement and scanning electron microscopy (SEM) respectively. The results show that both the chemical bonding and physically adsorbed layers exist between MBOw and SBW-III. The surface of modified MBOw is hydrophobic which improves the binding force between PVC and treated MBOw, and the dispersibility of MBOw in PVC significantly. The tensile and the elastic modulus of the SBW-III-treated MBO_w /PVC composites increase in comparison to that of the composites filled with untreated MBOw.

Abstract: The study examined the wear resistance of Al₂O₃/epoxy resin composite coating including the composite curing agents and its ratio,fillers volume fraction and its particle size.The results show that, firstly, when the low molecular polyamide and phenolic amine composite curing agent were added into the epoxy resin system within a proper ratio ,it can improve the coating wear resistance property, especially the quality ratio is 1:1. Secondly, when the fillers particle size is fixed, its volume fraction ranges from 0 to 36.8%, when the volume fraction is 23.4%, the wear resistance property is better. Thirdly, when the fillers volume fraction is fixed, its particle size ranges from 28μm to 106μm, when the size within the range of 58-75μm, it can significantly improve the wear resistance ,the best wear resistance is about 3 or 5 times of the basal material Q235,having a higher cost performance. Besides, the coating resistance mechanism was investigated.

Abstract: In this study, a kind of novel flexible foam-core sandwich composite was involved. The flexible foam-core sandwich composites were fabricated based on 3D warp-knitted spacer fabrics. The foam-core was filled in the spacer fabric by using a kind of modified hydrophilic polyurethane foam. In order to investigate the effect of spacer yarn inclination angle on the compression behaviors. A compression test was carried out. The compression stress-strain curve was used to analyze the effect of 3D warp-knitted spacer fabric spacer yarn arrangement. According to the experiment results, it indicates that the spacer yarn arrangement could influence the anti-compression capacity of the sandwich composites obviously. Therefore, the spacer yarn arrangement of 3D warp-knitted spacer fabrics can be changed to meet specific end-use requirement for foam-core sandwich composites.

Abstract: Wood composite is weak under heavy loadings, which was improved by reinforcing basalt fibres. In this study, chopped basalt fibres with different lengths (5mm, 10mm, 15mm and 20mm) were mixed with fir sawdust at 2.5%, 5%, 7.5% and 10% weight fractions to produce basalt fiber reinforced fir sawdust panels. The reinforced panels showed improved strength values. A maximum bending strength value of 44.1 MPa was obtained when the mean length of chopped basalt fiber was 15mm and the weight fraction was 2.5%. The tensile strength reached a maximum value of 17.4MPa when the mean length of basalt fiber was 10mm and the weight fraction was 10%. Compared with the unreinforced fir sawdust panel group, the reinforced panel group increased bending strength 60.7% and had a 47.5% increase in tensile strength. These findings demonstrate that basalt fibre has very promising prospects for strength improving.

Abstract: Ploy (N-hydroxymethyl acrylamide)/polyethylene glycol (PNHMPA/PEG) interpenetrating polymer network gel was prepared as new form-stable phase change thermal filler, and IPN distribute evenly in the new phase change thermal conversion coating. The polarizing microscope shows that IPN is crystalline, which proves its heat storage capacity. The DSC results indicate that the new PCM conversion coating has a good energy storage capability and an available phase transition temperature. The TG results show that the new coating has good thermal stability, and IPN effect of thermal decomposition is not affected by the coating composition.