Advanced Materials Research Vols. 306-307

Abstract: In this paper, three kinds of molecularly imprinted sol-gel film (MISF) which have good thermal and chemical stability and three-dimensional network porous structure have been developed. The material was synthesized by sol-gel technology using lambda-cyhalothrin, trichlorphon and beta-cyfluthrin as model analytes. The special structural behavior makes the material have good capability to seizure and capture template molecules which enhanced the MISF’s recognition efficiency and the property of separation and enrichment. The material was environmental friendly and easy to operate. The binding characteristic of the imprinted film to the three pesticides was evaluated by equilibrium binding experiments. The SEM of the three MISF has been performed to characterize the morphology of MISF. The MISFs were combined with chemiluminescence (CL) technology by modifying the sol-gel into 96 micro-well plate to establish one molecular imprinting- chemiluminescence (MI-CL) sensor which realized high selectivity, sensitivity and high throughput simultaneous assay of three pesticides. The proposed method was successfully applied to the simultaneous determination of multi-component pesticide residue in foodstuff.

Abstract: This paper carried out the applications of grey system theory to correlate asphalt compositions and heating conditions which consist of asphalt mass, heating temperature and length of heating time. To clarify the influences of the heating conditions, the asphalt compositions were determined, including four generic components, namely asphaltenes, resins, aromatics and saturates, the total contents of asphaltenes and resins replaced by A value, the total contents of aromatics and saturates replaced by B value, and the ratio of A and B(A/B value). Results show that all the four generic components are affected obviously by different conditions and none of the four generic is affected by the largest. The component most affected by asphalt mass is A/B value. In additionally, A value is influenced mainly by the length of heating time while B value by heating temperature.

Abstract: In this paper the influence of parameters of fabric preforms on permeability is described. The two-dimensional (2D) permeability has been determined continuously in a matched metal tool incorporating capacitive sensors with LabView. Beforehand, the glassfiber plain, twill, satin weave textile has been thoroughly evaluated to determine the permeability behavior of the textile in dependence on the fiber volume fraction. The paper reveals the significant influence of the fabric structure, and yarn linear density on the permeability values K1 and K2, the flow front ellipse shape, and the anisotropy of preforms.

Abstract: Super-absorbent polymer particles (SAPs) were used as a self-curing admixture for mortars. The effect of SAPs on mechanical properties of mortars was investigated. The performance of the mortars with SAPs added by two different ways was tested, which showed that the way of adding dried was more feasible to application. The performance of mortars with different curing methods was also tested. The results showed that SAPs in the mortars played a role of reserving water and the mechanical properties of hardened mortars with SAPs were better than those had no SAPs and exposed to the air, which suggested that incorporating SAPs can be an effective self-curing method.

Abstract: A novel amphoteric polycarboxylic acid-based superplasticizer (APC) was prepared by solution copolymerization from maleic anhydride (MA), allyl polyethylene glycol (APEG) and dimethyl diallyl ammonium chloride(DADMAC). The cationic monomer DADMAC was introduced for improving the performances of sulphoaluminate cement (SAC) with APC. The condition on preparation of APC was determined by the orthogonal experiment. The flow of paste and mortar were alao assessed. Results indicated that APC could improve the fluidity of paste and motar with APC. Zeta potential measurements indicate steric repulsion between the cement particles carrying adsorbed polymer molecules is the main mechanism for dispersion.

Abstract: Phase behavior of ternary systems involving PEO-PPO-PEO block copolymer (Pluronic P123), room-temperature ionic liquid, 1-butyl-3-methylimidazolium hexafluorophosphate [Bmim]PF6, and glycerol is investigated at 25 °C by using small-angle X-ray scattering (SAXS) techniques. In this ternary system, the structures formed in the binary P123/[Bmim]PF6 system, hexagonal phase (H1) and lamellar phase (Lα), are still obtained. At lower P123/[Bmim]PF6 ratio, the H1 phase can accommodate more than 30 % glycerol. At higher P123/[Bmim]PF6 ratio, the Lα phase only accommodates less than 2 % glycerol and Lα changes to H1 with increasing the glycerol content. Moreover, a phase separation takes place at a higher glycerol content. Solvatophobic interactions between hydrophobic groups of [Bmim]PF6 and P123, coulombic force existing in the polyoxyethylene chain and imidazolium cation, H-bond between P123 and glycerol, accompanying with the force ascribe to the nitrogen of the imidazole ring and the oxygen of alcohol are helpful for the formation of long-range ordered structure.

Abstract: Ultraviolet(UV) radiation is one of the main factors induce asphalt aged in the field in-service. Asphalt mortar greatly affects the pavement performance. It is scarce that studies concerning UV aging on the performance of asphalt mortar. In this paper, asphalt mortar with a 1.0 F/A (filler to asphalt)after UV aging were subjected to the test of the Dynamic Shear Rheometer (DSR).Effects of UV aging on the High-Temperature and fatigue performances of asphalt mortar were studied by using the rutting parameter G*/sinδ, fatigue parameter G*sinδ and dynamic viscosity. The results show UV aging had prominent effect on asphalt mortar’s properties, with the decrease of film thickness and increase of UV aging temperature, the ability of rut resistance enhances and fatigue performance weakens.

Abstract: The objective of this study is to investigate the preliminary feasibility on the utilization of shaped-stabled phase change materials (SSPCM) in asphalt concrete to control pavement high-temperature. A comparative study has been conducted on the properties of asphalt with and without SSPCM. The properties investigated include basic and rheological performance along with temperature-controlling effect of asphalt mortars. The results show that there exist stiffening and “temperature lag” effect for asphalt mortar containing SSPCM, which indicates that it may be promising to use SSPCM to reduce high-temperature of asphalt pavement.

Abstract: The static shear creep behavior of asphalt mastic containing recycled red brick powder (RBP) is investigated in this paper. The used mastic consists of asphalt and filler at a mass ratio of 1:1. Dynamic Shear Rheometer (DSR) performed the static shear creep tests at 0°C. The static shear creep behavior of RBP asphalt mastic was analyzed and modeled based on Burgers model. It is concluded that the introduction of RBP results in smaller deformation, higher static shear creep stiffness modulus of asphalt mastic at 0°C. It was also indicated that Burgers model can well explain the static shear creep behavior of RBP asphalt mastic.

Abstract: Carbon fiber with diameter in the range of nano to micro meter was prepared by carbonization of polyacrylonitrile (PAN) and polymethylmethacrylate (PMMA) blend fiber which was produced via wet spinning of PAN/PMMA blend solution. At the same technical condition, the high molecular of PAN favored the production of thin diameter of carbon fiber, and the high drawing ratio led to small diameter of the obtained nano/micro carbon fiber. The formation of graphite structure during carbonization was characterized by Raman and X-ray diffraction. The results improved that high temperature of carbonization developed high degree of graphitization and high conductivity of the nano/micro carbon fiber. The composites containing 2-8wt% of the obtained nano/micro carbon fiber were fabricated. The complex permittivity ε’ and ε’ for the composites in the frequency range of 8-12 GHz was measured, and the reflection loss for 180×180×3mm3 composites was also investigated. The microwave absorption property of these composites was improved greatly with increasing content of the nano/micro carbon fibers. At the addition of 8 wt% of the nano/micro carbon fiber, the reflection loss of the composite displayed -16dB at 11.3GHz, and the band with smaller than -5dB was 3GHz. Moreover, the calculated results based on the complex permittivity seem identical with the experimental values.