Advanced Materials Research Vols. 399-401

Abstract: The authors use the method of titanium salts on the surface of tourmaline particles hydrolyzing and coating TiO₂ to construct Tourmaline/ TiO₂ system in different conditions and characterize the catalyst system by TEM and SEM and Raman Spectra Pattern. The writers used phenol solution as the target compound to observe the removing effects of catalysis system on phenol under dynamic conditions. The results showed that: a. the compound photo catalysis system had brilliant decomposition performance on phenol. b. It would reach high decomposition efficiency on the initial phase of reaction when the rate of tourmaline to TiO2 was 1:1 and the decomposition efficiency could be 96.29% at 120min when the rate was 0.2, which was 26% higher than that of pure phase TiO2.

Abstract: Under conditions of microwave radiation (MW) and open-vessel reflux, acrylamide (AM) and diallyldimethylammonium chloride (DADMAC) were grafted to corn starch (St) by aqueous solution polymerization in air atmosphere. Continuous MW in conjunction with potassium persulfate (KPS) were utilized to initiate the above graft reaction. A representative copolymer of St-graft-poly(AM-DADMAC) was characterized by Fourier transform infrared spectroscopy, elemental analysis, scanning electron microscopy and energy disperse spectroscopy. Microwave power, radiation time, KPS concentration and AM/DADMAC molar ratio were investigated to examine their effects on grafting efficiency (GE) and cationic degree (CD). The optimal conditions under investigation were microwave power 500 W, radiation time 150 s, KPS concentration 2 mmol·L^–1, AM/DADMAC molar ratio 9∶1. The GE and CD obtained were 68.6% and 0.16 mmol·g^–1, respectively.

Abstract: Nitrogen organic boric acid ester was synthesized by hydroxymethylation BTA and oleic acid polyacrylamide boric acid ester two ethanol. Results showed that all of the capabilities were good when the synthesis of product’s additive quantity was 0.25%, and antirust properties kept well under a little higher temperatures and longer working-time. The product could be used as anti-rust and lubricating additives for water-based cutting fluid.

Abstract: In this paper, influence of micro-fines on the manufactured sand and influence of manufactured sand containing micro-fines on concrete is studied. Using the MB value of manufactured sand to control the content of micro-fines in manufactured sand. The experimental results show that if MB value is less than 1.0, content of micro-fines is less than 15%, concrete keeps a high level of compressive strength ; both the content and property of micro-fines have a certain influence on the compressive strength of concrete; the fineness of micro-fines has influence on the early strength of concrete, but little influence on the later strength of concrete.

Abstract: The influences of phenolic resin on the properties of both Magnesium oxychloride cement (MOC) pastes and MOC abrasive tools were investigated in this study. By incorporating phenolic resin in the MOC pastes,With 5% phenolic resin ,the compressive strength of MOC paste decreased by 26% , the flexural strength of MOC pastes decreased by 21%, the abrasion loss of MOC abrasive tools decreased by 37%, the strength softening coefficient greatly increased. The mechanism maybe due to the microstructure of the MOC pastes became more compact with phenolic resin adding, the rate of hydrolyzation reaction of MOC phases would be postponed.

Abstract: A new low cost adsorbent crosslinked chitosan resin has been used to remove dyes from wastewater. The crosslinked chitosan resin was prepared using inverse suspension polymerization with methanal and epichlorhydrin (ECH) using pre-crosslinking and crosslinking techniques. As comparison, the adsoption ability of chitosan and activated carbon was also investigated.

Abstract: The cotton stalks bast fiber was a new kind of natural cellulose fiber, the fibers had the similar properties as the flax fibers. Polylactic acid (PLA) is a class of biodegradable matrix material. As the flax fibers can be reinforced materials and then compounded with PLA, cotton stalks bast fibers as reinforced materials and PLA as matrix were used to make a kind of green and biodegradable composite in the experiment. The composites were prepared by mixing, molding and cold forming. Orthogonal experiment table including length of the fibers, mass fraction of PLA, molding temperature and molding pressure was devised. Then the tensile strength, flexural strength and impact strength were tested and the analysis of range and variance was done. The optimal processing condition was obtained as follows: length of the fibers was 6mm, mass fraction of PLA was 75%, molding temperature was 175°C and molding pressure was 12MPa. The result showed that the cotton stalks bast fibers reinforced PLA biodegradable composites had good mechanical properties. Through this study waste cotton stalks basts were turned into useful resources and provided a kind of environmentally friendly composites.

Abstract: The p-toluene sulfonate- pillared layered double hydroxide(PTS-LDH) was synthesized by co-precipitation method, unsaturated polyester resin/ PTS-LDH composites were prepared by solution blending and solidifying. The X-ray diffraction was used to characterize the structure of the composites. The thermal stability and fire properties of composites have been studied by thermo- gravimetric analysis, limit oxygen index and UL94 burning test. The results show that the interlayer space of original LDH was 0.775nm, which was increased to 1.73nm for PTS-LDH and 2.077 nm for unsaturated polyester resin/ PTS-LDH composite. The addition of PTS-LDH improved the flame retardancy of unsaturated polyester resin. Limit oxygen index of unsaturated polyester resin/ PTS-LDH composite was increased to 23.30 % from 21% of the pure resin, the char residue rate increased by 3.7% and the speed of horizontal burning was decreased by 20.24%. The vertical burning test (UL-94) results indicated that the materials achieved V-2 grade.

Abstract: In this study, a novel phosphorus-nitrogen containing intumescent flame retardant (P-N IFR) poly(melamine 2-carboxyethyl(phenyl) phosphate)(PMCEP) was prepared via the reaction of 2-carboxyethyl (phenyl) phosphinic acid (CEPPA) and melamine (MEL) in two-steps. Meanwhile, the molecular structure of the chemical compound was determined by FTIR,1H-NMR and elemental analysis; and the thermal properties was investigated by means of TGA. Combustion studies revealed high limiting oxygen index (LOI) indicative of better flame-retardancy properties for PBT resin.

Abstract: This work emphasizes on the study of Pozzolanics Local Soil Brick properties. The compressive strength and flexural strength on modulus of rupture properties are investigated. At the ratio of 5% Portland cement type 1 and 30% fly ashes by weight at water powder ratio (w/p) 0.3525. This brick is called as Pozzolanics soil bricks. Their properties are compared to soil cement bricks (RCM35) at the age of 3, 7, 14, 28, 60, 90, 120, 150, 180, 210, 240, 270, 300, 330 and 360. Results show that the compressive strength and flexural strength increase with increasing curing time. The compressive strength and the flexural strength at 360 day curing times increases as 41.83% and 43.77%, respectively compared at 28 day curing times. Similar to soil cement bricks, the compressive strength and flexural strength of Pozzolanics soil bricks increase as 20.80% and 11.94% respectively compared between 360 day and 28 day curing times. However, comparing to RCM35 at 360 days the compressive strength and the flexural strength are lower as 60.43% and 4.90 times respectively.