Applied Mechanics and Materials Vols. 117-119

Abstract: The relationships between (meth)acrylate polymers structure and its film surface wettability were analyzed. A series of random (meth)acrylate polymers were prepared by the free radical solution polymerization and their coating film wettability was analyzed by measuring water contact angles(CAs). There are three kinds of functional groups on the surface, including methyl, ethyl and ester group, and the surface energy of ester group is greater than the others. The more ester group on the surface will result in the better surface hydrophilicity. Polymer structure parameters as the side chain length(m) and glass temperature(Tg) are taken into account in discussing the migration of functional group to the outermost surface. It was found that the less m and lower Tg will promote the motion of the side chain and hence cause the surface exhibiting more hydrophilicity.

Abstract: Hemicelluloses were extracted from coconut shell by ultrasound-assisted alkaline solution of hydrogen peroxide method. Chemical composition and physicochemical properties of the hemicelluloses obtained were elucidated by FT-IR spectra analysis and molecular determination. The results show that the yield of hemicelluloses from coconut shell is highly dependent on the pH-solution, reaction time, and H₂O₂ concentration.

Abstract: Palladium catalysis cross-coupling reaction has been widely used and played an important role in medical, new material and other fields. In this paper, we take Pd₂(dba)₃ as catalyst and BINAP as ligand, formulate two poly(imino ketone)s (PIKs) by C-N Cross-coupling Polycondensation. The thermal property of PIKs were tested via thermogravimetric analysis (TGA), and the result showed that PIKs possessed high thermal decomposition temperature.

Abstract: Because of the requirements of building palisade structure, reinforced concrete members on the wall outside form thermal bridge. According to in hot summer and cold winter climate characteristics, and analysis of the exterior insulation system properties, thermal bridge from heat preservation material selection, construction technology and construction indoor maintenance in prevention and control measures proposed thermal bridge.

Abstract: Palm oil fuel ash is considered as an agro-waste material in Malaysia. Various investigations have been conducted on the use of palm oil fuel ash as a supplementary cementing material for concrete. In the present study, palm oil fuel ash was used as a partial replacement of normal portland cement to produce high-strength self-consolidating concrete. In total, twenty (20) self-consolidating concrete mixes were prepared by varying water to binder ratio, palm oil fuel ash content, and high-range water reducer dosage. Palm oil fuel ash was used by replacing 0–30% of normal portland cement by weight at the water to binder ratios ranging from 0.25 to 0.40. The compressive, splitting tensile and flexural strengths, modulus of elasticity, ultrasonic pulse velocity, and porosity of various self-consolidating concrete mixes were investigated. However, the correlations between the hardened properties of concrete were emphasized in this study. The experimental findings revealed that strong correlations exist between different hardened properties of high-strength self-consolidating concrete.

Abstract: New type Fe-Cu alloy is used in the bar of induction motor with compound cage rotor(IMCCR). In this paper, the preparation of three kinds of Fe-Cu alloy is introduced. The influence of its microstructures, hardness and impact toughness is studied by using metalloscope and scanning electron microscope. Meanwhile, physical propertie such as resistivity, and B-H curve is tested by using magnetic testing device and bridge circuit. The influence of carbon content changing on microstructure and performance of Fe-Cu alloy is analysised, which has positive significance to the new type material using in motor.

Abstract: In this paper, a new pH/temperature sensitive beads with core-shelled structure, composed of sodium alginate and poly(N-acryloylglycinate), were prepared using as drug delivery carrier. Selecting indomethacin as a model drug, in vitro drug release behaviors were investigated at different temperatures, phosphate buffer solutions (PBS) and polymer content. At pH=2.1, the release amount of indomethacin loaded in the beads was only 2.46% while this value approached to 95.23% in pH=7.4 PBS. In addition, the release rate of indomethacin at 37°C is much higher than at 18°C.

Abstract: Effect of phosphorus slag and fly ash on anti-corrosion property of high belite cement has been researched in the paper. Results show that, the anti-corrosion resistance of high belite cement is obviously higher than mediate heat cement. Admixing one of phosphorus slag and fly ash or both in cement all can improve the corrosion property, but admixing fly ash has more influence. For cement mixed with phosphorus slag and fly ash, effect of the fineness and proportion of phosphorus slag on anti-corrosion coefficient K is not significant.

Abstract: Piezoelectret films, with a controlled ordered microstructure and various porosities, were fabricated by using a patterning-fusion bonding method. The polarization in the films with various porosities is investigation. The results show that the critical applied bias voltage for the breakdown in the inner voids is dependent on the porosity in the films. The threshold voltages for the polarization in the fabricated films with the porosities of 0, 25 and 44% are around 4000, 2000 and 2000 V, respectively. The piezoelectric d33 coefficients are enhanced by increasing the applied bias voltage during polarization.

Abstract: In this study, poly(N,N-diethylacrylamide-co-itaconic acid) (P(DEA-co-IA)) copolymer hydrogels were synthesized by changing the initial DEA/IA molar ratio, N,N-methylenebisacrylamide and total monomer concentration. The thermo-sensitive and mechanical performances were optimized by altering the above parameters. In comparison with the PDEA hydrogel, the equilibrium swelling ratio (ESR) and lower critical solution temperature (LCST) of the hydrogels changed with the alternation of the above parameters. The swelling and deswelling kinetics was also studied in dital. The release behaviors of the model drug, aminophylline, are found dependent on hydrogel composition and environmental temperature, which suggests that these materials have potential application as intelligent drug carriers.