Advanced Materials Research Vol. 1088

Abstract: A flame-retardant polyester fabric was obtained by eco-friendly water-based polyurethane adhesive for coating, which was made of waterborne polyurethane and several flame retardants. It was found that the combination of Doher6206 and MCA is an effective flame retardant. The concentrations of the combination and polyurethane as well as the process conditions were optimized. The optimize result was gained while the cure temperature was 150°C, cure time was 3 min, coating width was 0.1mm and coating rate was 4.15 m/min. Because of the good performance in flame-retardant and eco-friendly, the flame-resistant polyester fabric has the potential to be used in the inner decoration of the car and the plane, curtain, and the inhibitor of baby car and so on.

Abstract: Waterborne polyurethane (WPU) emulsions were prepared with Tung oil anhydride-ester polyol (TOAEP) as modifier via the acetone process. The structure, morphology, emulsion particle size, thermal property and mechanical property of the Modified WPU were investigated by FT-IR, SEM, Laser particle size analysis, TG and tensile test, respectively. The experimental results show that the modified WPU emulsion particle size increases along with the growth of weight content of TOAEP. Compared with the unmodified WPU emulsion film, water and toluene absorption of the modified WPU emulsion film have decreased significantly, indicating that water and solvent resistance are remarkably improved after the modification. Tensile test shows that the tensile strength of the modified WPU emulsion film increases with the content of TOAEP while the reverse is true for the elongation at break. The characteristic thermo-decomposition temperatures of WPU have been increased notably after modification by the introduction of TOAEP which indicates that the heat resistance has been improved after modification. Morphology analysis shows that the soft segment phase and hard segment phase in the WPU are more compatible after modification.

Abstract: Unsaturated polyester resin (UPR) is one of the film-forming resins commonly used for preparation of coatings. However, the general type UPR has some disadvantages which limit its application such as poor water resistance, solvent resistance, heat resistance and mechanical properties. To improve common UPR’s comprehensive performance, methyl-α-eleostearate-maleic anhydride adduct (MEMAA), a derivative from Tung oil, was prepared and introduced into UPR system to form MEMAA modified UPR (M-UPR). Influences of MEMAA’s dosage in M-UPR on water and toluene absorption and tensile strength of M-UPR were investigated. The thermal property and morphology of M-UPR were also studied by TGA and SEM, respectively. Experimental results show that the water resistance, solvent resistance and tensile strength of UPR have been improved a lot and the heat resistance of UPR also has a certain degree of improvement after UPR’ being modified by MEMAA. Compared with the common UPR film, when the dosage of MEMAA is 9% of UPR’s mass, the water absorption, toluene absorption of M-UPR film are decreased by 21.0% and 18.6%, respectively, and whereas, the tensile strength and thermal decomposition temperature of UPR film are increases by 14% and 20 oC.

Abstract: A kind of high-performance bismaleimides composite has been fabricated using carbon nanotubes as filler, in which the carbon nanotubes was grafted by hyperbranched triazine compound (HPTC-CNTs). The investigation of properties the composites show that the addition of the appropriate content of HPTC-CNTs can enhance the tribological properties. It’s worth noting that when the content of HPTC-CNTs is 0.6 wt. %, the frictional coefficient and the wear rate decrease by 29.5% and 91.8% respectively compared to neat BMI. Scanning electron microscope（SEM）reveals that wear mechanism of neat BMI is mainly fatigue wear, but it turns adhesive mainly wear after the incorporation of HPTC-CNTs. The main reason can be the good dispersability and compatibility of HPTC-CNTs in the bismaleimides matrix.

Abstract: The properties of the interface between biomaterials and the host tissue play an important role for the process of successful adaptation of implants. Extensive research has focused on shortening the time of osseointegration by modifying the surface in adding a coating such as hydroxyapatite (HAp). We have developed a new type of biocompatible nanohydroxyapatite (n-HAp) coatings, which are characterized before and after deposit on a Ti-6Al-4V substrate using neutron diffraction and scanning electron microscopy. Three months after the implantation in the sheep tibias, high-energy synchrotron radiation (ID15B, ESRF, Grenoble, France) diffraction studies of the cortical bone identify that the c-axes of HAp are preferentially oriented in the direction of the stresses that bone usually withstands. This non destructive analysis of the bone-implant interface proves that bone maturation is achieved successfully with this novel n-HAp coating and demonstrates that the mineralization is completed without spatial organization. None of these findings are obtained with uncoated titanium alloys. The presence of this n-HAp coating on Ti-6Al-4V substrate is decisive in obtaining this mature bone at the interface.

Abstract: The research develops and tests new hybrid biomimetic materials that work as mechanically stimulating "scaffolds" to promote early regeneration in implanted bone healing phases. A biomimetic nanostructured osteoconductive material coated apparatus is presented. Bioinspired approaches to materials and templated growth of hybrid networks using self-assembled hybrid organic-inorganic interfaces is finalized to extend the use of hybrids in the medical field. Combined in vivo, in vitro and computer aided simulations have been carried out. A new experimental methodology for the identification of design criteria for new innovative prosthetic implant systems is presented. The new implant design minimizes the invasiveness of treatments while improving implant functional integration. A new bioactive ceramo-polymeric hybrid material was used to modify odontostomatological Titanium implants in order to promote early fixation, biomechanical stimulation for improved scaffold mineralization and ossification. It is a hybrid ceramo-polymeric nanocomposites based on Hydroxyl-Ethyl-Methacrylate polymer (pHEMA) filled with nanosilica particles that have shown biomimetic characteristics. This material swells in presence of aqueous physiological solution leading to the achievement of two biomechanical functions: prosthesis early fixation after and bone growth stimulation. Such multidisciplinary approach explores novel ideas in modelling, design and fabrication of new nanostructured biomaterials with enhanced functionality and improved interaction with OB cells

Abstract: A new phthalocyanine Zinc(II) bearing benzyl ether dendritic substituents with nitro-terminal group: tetra-{3,5-[di-(4-nitro benzyloxy) benzyloxy]} Phthalocyanine Zinc(II) (ZnPc(NO2)8), was synthesis and characterized by IR, 1HNMR, MALDI-TOF-MS and UV/Vis. UV/Vis spectra of ZnPc(NO2)8 exhibited characteristic absorption peaks at 290, 350 and 680 nm, and fluorescence emission peak was at 692 nm with a quantum yield at 0.20 in dimethylsulfoxide (DMSO). The polymeric nanoparticle ZnPc(NO2)8@MPEG-PLGA was formed between the amphiphilic block copolymer poly(ethylene glycol)-polylactic and polyglyctic acids (PEG-PLGA) and ZnPc(NO2)8, ZnPc(NO2)8@MPEG-PLGA formed a core-shell-type nanoparticle with diameter about 70 nm. UV/Vis spectra and fluorescence emission spectra of ZnPc(NO2)8@MPEG-PLGA were obviously lower than that of free ZnPc(NO2)8 in buffer solution, and with varying degrees of redshift. ZnPc(NO2)8@MPEG-PLGA would be a promising third-generation photosensitizer for PDT.

Abstract: Objective: To study the effect of concentrated growth factor (CGF) on reducing bone resorption in immediate implant. Methods: 20 immediate implant patients were divided into two groups, each group included 10 patients who were treated by adding CGF or Bio-oss to the gap of implant-bone, respectively; the labial new bone regeneration was evaluated in postoperative 1 years using cone beam CT. Results: The buccal bone width variation of the CGF group was 0.85±0.25mm, and the Bio-oss group was 0.35±0.25mm (p <0.05). Conclusion: The CGF has no significant role in promoting new bone regeneration when was used alone in the gap of implant - bone in immediate implant

Abstract: Currently, succinic acid produced from microbial fermentation has attracted great interests by many researchers, due to its low cost and friendly environmental benefits. Among various microbe, Escherichia coli species have been considered as suitable succinic acid-producing strains, which could utilized a wide range of substrate. In order to acquire sucrose-consumed strains, a genetically modified E. coli JH208 was constructed using the RED recombination system and the flipase recognition target (FRT) site-specific recombinant technology. In 48 h, the production of succinic acid from sucrose by JH208 is 48.46 g/L, the productivity is 1.01 g L^-1 h^-1, with a succinic acid yield of 0.83 g/g sucrose. The by-products were very low in the fermentation, acetic acid was 4.22 g/L, the ethanol concentration was less than 0.10 g/L, and formic acid and ethanol was not detected.

Abstract: G-quadruplex is expected to be a promising target for drug design. The manually synthesized small-molecule compounds are able to induce the formation of and stabilize G-quadruplexes. In this paper, we summarize the current understanding of the structure of G-quadruplexes, the binding mode of G-quadruplexes and small-molecule ligands, and important synthesized small molecules targeting G-quadruplexes as potential drugs.