Advanced Materials Research Vols. 197-198

Abstract: Fe (III)-amidoximated PAN fiber complex was prepared and used as a heterogeneous photo-Fenton catalyst for the oxidative degradation of Reactive Red 195 in water. The nature and concentration effect of inorganic salts on the dye degradation was investigated. Moreover, UV-Vis spectrum was also used to examine the decomposition process of the dye in the presence of the salt. The results indicated that the existence of the inorganic salts limited the photocatalytic degradation of the dye in water. Na₂SO₄ shows more strong inhibition effect on dye degradation than the other salts at the same conditions. UV-Vis spectrum demonstrated that the decomposition of the aromatic rings in the dye molecules was also reduced in the presence of the salt.

Abstract: The tribologcial performance of PTFE composites filled with different contents of spherical-graphite and Flake-graphite were comparatively evaluated on MM-200 test rig in block-on-ring configuration under dry condition. The microstructures of worn surfaces of PTFE composites were examined with SEM, and wear mechanisms was also analyzed. The changes of notched impact strength with the content changed were also considered. The results show that the tribological performance of spherical-graphite was better than flake-graphite with same weight filled: The friction coefficient of spherical-graphite, about 0.10~0.15, was under flake-graphite, about 0.12~0.18; the wear rate of spherical-graphite was lower than flake-graphite at each content. Notched impact strength of spherical-graphite was from 7.0kJ/m² to 8.7 kJ/m² with the content increased, while flake-graphite was fall rapidly from 8.5kJ/m² to 3.0kJ/m² with the content added more than 5wt. %.

Abstract: In this paper, the buffer clay was prepared by methylphenyl silicone oil mixed with talcum powder, molybdenum disulfide (MoS₂) and zinc oxide (ZnO), and the methylphenyl silicone oil was synthesized by the mixture of methylphenyl cyclosiloxane (Ph-D₄) and the octamethylcy-clotetrasiloxane (D₄) with tetramethyl ammonium hydroxide as catalyst. By ultraviolet spectroscopy (UV), nuclear magnetic resonance (NMR) analysis of the molecular structure of methylphenyl silicone oil was characterized.

Abstract: A SiO₂ aqueous sol was prepared and mixed with the anatase TiO₂ sol synthesized at low temperature in different molar ratios for the coating of cotton fabrics using padding-drying process. And then the photocatalytic activity of the resulting SiO₂/TiO₂-loaded cotton fabrics was evaluated in the degradation of Rhodamine B in water. The effect of the SiO₂ content on the photocatalytic performance of the loaded fabrics was investigated with respect to dye decoloration percentage. UV-Vis spectrum was also used to examine the dye degradation process in the presence of the SiO₂/TiO₂-loaded cotton fabric. The results indicate that when the ratio of Si/Ti reaches 1:1-3, the finished fabrics have the best photocatalytic activity. Moreover, UV-Vis spectrum indicates that the addition of SiO₂ on the cotton fabric can enhance the decomposition of the dye molecular azo linkages and aromatic rings.

Abstract: A series of polyols (GSOLs) with a range of hydroxyl numbers based on epoxidized soybean oil (ESO) were prepared by ring opening with glycol. These Polyols of hydroxyl (OH) numbers ranging from 111 to 162 mg KOH/g were obtained. The environmentally friendly soybean-oil-based waterborne polyurethane dispersions (SPU) with very promising properties have been successfully synthesized from a series of soybean-oil-based polyols (GSOLs) with different hydroxyl numbers by a polyaddition reaction with toluene 2,4-diisocyanate (2,4-TDI). The structure and thermophysical properties of the resulting SPU films have been studied by Fourier transform infrared spectroscopy, differential scanning calorimetry, thermogravimetric analysis, and hardness testing. The experimental results showed that the functionality of the GSOLs and the hard segment content play a key role in controlling the structure and the thermophysical properties of the SPU films.

Abstract: The cotton fiber was oxidized to dialdehyde cellulose by sodium periodate oxidation reaction. The oxidized cotton samples having different oxidation level were obtained with adjusting the periodate concentration and oxidation time. The wide angle X-ray diffraction analysis indicated the crystallinity of the cotton cellulose by the slight oxidation increased, whereas the crystallinity decreased significantly with increase in the degree of oxidation of the cotton cellulose. Differential scanning calorimetric curves of the oxidized samples showed that the slightly oxidized cotton cellulose decomposed at a somewhat higher temperature than the original cotton cellulose in the endothermic decomposition stages up to 350 . However, as the periodate concentration and oxidation time were enhanced further, the endothermic decomposition peak of the oxidized cotton cellulose shifted fast to lower temperature. Furthermore, the changes in the structure and crystallinity were also reflected in the mechanical property studies of these oxidized cellulose samples. The mechanical strength of the cotton thread, which was oxidized by periodate at the concentration of 0.0–1.0 mg/ml and oxidation time for 0–3 h, was found to be almost the same as the original cotton thread, but it decreased remarkably when the oxidation conditions became stronger. These results obtained suggest information in understanding the crystalline structure changes of cellulose in periodate oxidation and planning applications of the oxidized cellulose products.

Abstract: A series of cross-linked polyurethane(PU) elastomer samples with various crosslink density were synthesized from polyether diol(PPG2000), 4,4’-diphenylmethane diisocyanate(MDI), 1,4-butanediol(BDO) , trimethylolpropane (TMP) and glycerin. The cross-linking density of the PU elastomers was calculated by Flory–Rehner equation. The degree of hydrogen bonding, the microstructure and the morphologies of these PU materials were characterized by means of FT-IR, DSC and DMA. The experimental results showed that the PU elastomers containing a small amount of crosslink agent ( TMP or glycerin ) may make tanδ to a very low value above the ambient temperature. The PU elastomer samples using glycerin as curing agent can make tanδ to a low value in a lower temperature compared with the ones using TMP as curing agent.

Abstract: In this paper, the property of the ceramic corundum (SG) abrasives are studied with the way of roasting the ceramic corundum (SG) abrasives in the different roasting temperature, and using microscope, the change pattern of the ceramic corundum (SG) abrasives have been observed under different roasting temperature. The research results indicated that when the temperature achieves 900°C, the ceramic micrite abrasives start to have flaws, crack and hole. Therefore, the ceramic corundum (SG) abrasives with the roast, the manufacture and the application temperature to control in 900°C below, which guarantee the performance of the ceramic corundum (SG).

Abstract: The aim of this study was to prepare and investigate the isosorbide dinitrate transdermal patches (IDPs) in the concentration of 40 mg/cm². Acrylic pressure sensitive adhesives (PSA) were used to formulate IDPs. IDPs were prepared by casting method. The effect of content of PSA, and concentration of enhancer, propylene glycol, in the formulations were evaluated. IDPs were investigated for their thickness, weight/area ratio, adhesiveness and in vitro skin permeation. The higher the content of PSA in the formulation, the higher the thickness and the W/A ratio. Propylene glycol added in the formulation (2.5, 5, 10%) significantly enhanced the skin permeation of ISDN. The higher the content of PG, the higher the flux of ISDN through the skin. Our research suggests that isosorbide dinitrate loaded with 10% of propylene glycol in acrylic matrix pressure sensitive adhesive can be potentially used as a transdermal drug delivery system.

Abstract: Novel soluble three-component conjugated copolymers are synthesized by palladium- catalyzed Suzuki coupling reaction from 9,9-dioctylfluorene (DOF), 9-ethylhexylcarbazole (Cz) and 4,7-dithien-2-yl-2,1,3-benzothiadiazole (DBT) with Cz composition varying from 1-15 mol% in the copolymer. All of the polymers are soluble in common organic solvents and are highly photoluminescent. The electrochemical, optical, photoluminescent (PL) and electroluminescent (EL) properties of the copolymers were studied. When the hole transmitting material carbazole is introduced into the copolymer PFO-DBT, the hole mobility of the luminescent layer material is improved. The three-component copolymers compared with copolymer PFO-DBT15, Devices made up of these copolymers still emit saturated red light. The highest external quantum efficiency achieved in the device configuration ITO/PEDT/PFO-Cz-DBT15/Ba/Al is 1.81% for the copolymer for 10% Cz content, higher than that of the device made from PFO-DBT15.