Advanced Materials Research Vols. 197-198

Abstract: Structures of ferrocene containing hyperbranched polyester (HBPE-Fc) was characterized by FTIR and H1 NMR. The spectroscopic analysis provided evidence of the successful modification of ferrocene toHBPE. The catalytic performances for thermal decomposition of ammonium perchlorate (AP) were investigated by DSC techniques. The kinetic parameters were computed by the Kissinger method. The results indicated that the presence of HBPE-Fc reduces the maximum decomposition reaction temperature in AP samples. HBPE-Fc presented an efficient catalytic effect on the thermal degradation of AP and the catalytic reactions were characterized by decreased activation energy and increased rate constant of thermal decomposition. The possible catalytic mechanism was proposed.

Abstract: With science and standard of living progressing, functional textile become more and more popular. We reported that a new bamboo pulp fiber fabric with the chitosan modification (CMBPFF) was prepared by the selective oxidation of sodium periodate and then treatment with a solution of chitosan aqueous acetic acid. The resulting CMBPFF is a nonpolluting and eco-friendly fabric product through the method of natural raw materials and no additives, which not only increase the added value of the product but also achieve natural ecological fabrics. This research using Kjeldahl nitrogen analysis showed that the maximum percentage of chitosan crosslinked on bamboo pulp fiber fabric was 10.52% (w/w). FT-IR spectra characterization suggested that the imine covalent bond between the chitosan and the oxidized bamboo pulp cellulose was formed through a series of reaction. The breaking strength of the modified fabric remained basically unchanged when the concentration of sodium periodate was less than 2.0 mg/ml. Furthermore, the chitosan modified bamboo pulp fiber fabric had the good antibacterial property. The wrinkle recovery angle and moisture regain of the chitosan modified fabric were improved. Meanwhile, a model experiment for the controlled release the drug was investigated using cactus extracts, a component of a Chinese medicine, indicated the extensive applicability of CMBPFF as a carrier for the controlled release drugs.

Abstract: For investigating effect of soft finish on the handle of polyester fabric, the study shows physical properties on polyester fabric before and after finishing, then making some comparison base on the test results. KES-F (Kawabata Evaluation System for Fabric) system was used in the test. The study shows that the fabric samples exhibit noticeable improvement on wearable property after soft finish.

Abstract: N, N-diamino-N-octadecyl-N-trimethyl ammonium chloride were used as an intercalation agent to treat Na⁺-montmorillonite and for forming a kind of OMMT. OMMT was analyzed by fourier transform infrared spectroscopy (FTIR) and wide angle X-ray diffraction (XRD). Novel polybutadiene styrene rubber (SBR)/organic montmorillonite (OMMT) composites were prepared by SBR and OMMT. Properties such as cure characteristic, tensile strength, elongation at break, abrasion loss and thermal properties were researched and compared. Results showed that SBR/OMMT-10% composite had the best tensile properties.

Abstract: Polyarylene ether nitrile (PEN)/polyphenylene sulfide (PPS) blends were prepared via a melt-mixing process. The melting flow properties, compatibility, thermal and mechanical properties were characterized by melting index test, dynamic mechanical analysis (DMA), thermal analysis, tensile test and the fracture suface morphologies. The melt-mixed PEN/PPS blends displayed the excellent melting flow properties during processing. With the content of the PPS increased in the PEN, the melting index of the blends increased considerably, which is beneficial to the processability of PEN. PPS was found to be incompatible with the PEN by the DMA and DSC results. Morphology examinations reveal that the PPS phase is randomly dispersed as droplets with an average size of about 1~2 μm in PEN matrix, which is the main reason to enhance the toughness of PEN. Importantly, the blending materials maintained the characteristic thermal and thermo-oxidative stability as well as mechanical properties of the PEN as considering the further commercial applications.

Abstract: Sodium lignosulfonate -chitosan (SLS-CS) polyelectrolyte complex was prepared by alkaline lignin and chitosan as raw materials. The structure and thermal stability of SLS-CS polyelectrolyte were characterized by FTIR, XRD, DSC. The results indicated that NH³⁺ was formed by the protonated amino groups of chitosan and then came into SLS-CS polyelectrolyte complex with -SO3Na of sodium lignosulfonate through electrostatic adsorption. Compared with the sodium lignosulfonate and chitosan, the thermal decomposition temperature of SLS-CS raised and thus improved the thermal stability; the amorphous peak tends to decrease; SLS-CS polymer arrangement appeared more ordering, and the molecular interaction were enhanced.

Abstract: Direct preparation of activated carbon (AC) from coal was reported by microwave heating with potassium hydroxide as activation agent. Electrochemical properties of AC electrodes were investigated by cyclic voltammetry, constant current charge–discharge. The results show that functional groups on AC include –C=O, –O–H and –C–O. The micropore volume of AC from different coal totals 48.5–95.6%. The total pore volume of AC from different coal passes through a maximum with the decrease of volatile mater content in coal. The specific surface area and total pore volume of AC from Qing ting coal reach 1874 m² g^-1 and 1.00 cm³ g^-1, respectively. The specific capacitance and energy density of AC from higher coal rank is usually bigger than that of AC from lower coal rank.

Abstract: With Bridgeman directional solidification method the single crystal alloys of CuAl base shape memory alloy (SMA) with different components were prepared. And their shape memory performance characters were systematically investigated. The results show that the single crystal of CuAlNiBe quaternary shape memory alloy has much better shape memory properties than that of the CuAlBe and CuAlNi ternary alloy. That meant that in the CuAl base SMA alloy the mixed addition of Be and Ni changed the quenching microstructure has a strengthening effect to improve the shape memory performance of the SMA alloy.

Abstract: Hexanedioic acid, PEG6000 and zinc oxide (ZnO) was chosen as raw materials,and tetrabutyl titanate as catalyst to synthesize the poly(ether ester) containing zinc (PEEM). PEEM and Diphenyl-methane-diisocyanate (MDI) as chain extender was added into polycaprolactam whose molecular weight is about 4000 for synthesizing poly (ether ester amide) containing zinc (PEEAM). The rheological behavior of PEEAM was investigated by an advanced rheometric expansion system (ARES). Dynamic rheometer was used to measure the structures and properties of PEEAM. The dynamic rheological test indicated that the complex modulus (G*), the dynamic storage modulus (G”) and loss modulus (G’) of the PEEAM increase with the frequency (ω) increasing; the complex viscosity (η*) decreases linearly with the ω increasing, and decreases slightly with the temperature increasing, which indicates obvious flow behavior of pseudoplastic fluid. The Cole-Cole curves are convex, in the low frequency zone, the real number viscosity at 260°C is smaller than the real number viscosity at 230°C. The loss tangent (tan δ) presents a miximum with the increase of ω.

Abstract: A proton exchange membrane of blended poly (acrylamido-2- methylpropane sulfonic acid) grafted onto modified poly (vinylidene fluoride) membrane (PVDF-g-PAMPS) was prepared The influences of Na₄SiO₄ content, reaction temperature and time, content of ammonium persulfate and AMPS on PVDF-g-PAMPS membrane were discussed. The results show that the optimal reaction conditions are as follows: Na₄SiO₄ is 8%; ammonium persulfate is 0.016 mol / L; AMPS is 30 %; the reaction temperature is 80 °C and the reaction time is 1h. On the condition, PVDF-g-PAMPS membrane conductivity can reach to 1.27×10^-2 S/cm.