Advanced Materials Research Vols. 535-537

Abstract: Here, we synthesized a series of polymeric thermal stabilizers for polyvinyl chloride (PVC) based on maleic anhydride derivatives, including N-phenylmaleimide (NPMI), N-p-chlorophenyl maleimide (NCIPMI), N-p-nitrophenyl maleimide (NNOPMI), dibutyltin maleate (DBTM) and dioctyltin maleate (DOTM). Five specimens were prepared by mixing and rolling through a blending machine and a double-roller mixer, respectively. These samples were first subjected to thermal degradation in a 180°C hot oven, and fractions were collected every 10 min, followed by spotting on a slip of test paper. From the degree of color change in the test paper, the influences of these compounds on the thermal stability of PVC were estimated and such mechanisms were also discussed.

Abstract: The copolymerization of acrylamide (AM), Dodecafluoroheptyl methacrylate (G04), acrylic acid and the polycondensate of maleic anhydride and Polyethyleneglycol (PEG400) was studied in detail with benzoyl peroxide (BPO) as initiator when supercritical CO₂ and the acetone solvent were presented. The functional fluoride hydrophobic associating polymer products have some special characters with excellent performance of gas storage The structure of the copolymer products was characterized by FTIR, MR, 1H-NMR and SEM analysis.

Abstract: PEN and PPS resin sections in certain proportion are blended together physically in order to produce filaments, which constantly go through the drafts so as to be converted into FDY. In this article, the effect of draft ratios to the strain and the shrinkage ratio of PEN-PPS FDY will mainly be discussed.

Abstract: The static scale inhibition method will be used to evaluate the scale inhibition performance of HEDP. In order to study the corrosion inhibition of 20A steel with additive of HEDP in the industrial boiler water medium，the total iron ions in the solution are determined through autoclave static experiments. The results indicated that the scale inhibition efficiency，in the simulation boiler water with a certain concentration ratio and temperature，reached the maximum when CHEDP is 7 mg/L. It has a good corrosion inhibition effect on the 20A steel when the HEDP concentration exceeds 15ppm.

Abstract: This paper describes the synthesis of new side chain nematic liquid crystalline elastomers (LCEs) by a one-step hydrosilication reaction. The phase behavior and mesomorphism were investigated by differential scanning calorimetry (DSC), polarizing optical microscopy (POM), and x-ray diffraction (XRD). The effect of the content of crosslinking units on the phase behavior and mesomorphism of elastomers P1 – P8 was discussed. The nematic LCEs exhibit elasticity, reversible phase transitions, and nematic thread texture. The experimental results demonstrate that the glass transition temperature and isotropic temperature of nematic LCEs decreased with increasing the content of crosslinking unit.

Abstract: Abstract: When the dose level of polymer is settled, the change of injection volume and concentration do not increase oil recovery obviously, while the result of lab research shows that the increasing of oil recovery of high concentration and high molecular weight polymer flooding can reach or over that of ASP flooding. The aim of this paper is to study the shear characteristic in high concentration and high molecular weight polymer flooding, and analyzed the suitable parameter of it.They can provide the theory of high concentration Polymer flooding. In the process of polymer flooding, it was because increasing the water phase viscosit and the retention effect of polymer molecules in porous media that making oil flow degrees than improved ,the sweep volume expand, and improve the oil recovery. Study confirmed [1-3], polymer solution with sticky elastic can effectively improve the oil displacement efficiency, reduce residual oil saturation [4-5]. So, the study on the shear properties of the polymer system in high concentration (>1000mg/L) can provide experimental base for a high concentration of polymer flooding, it also has important significance on theory of polymer flooding development and application research.

Abstract: Polydimethylsiloxane/poly (methyl methacrylate) (PDMS/PMMA) blends were prepared by radical copolymerization of methyl methacrylate (MMA) and divinylbenzene (DVB) in the presence of PDMS. Elastomers based on PDMS/PMMA blends were formed by cross-linking PDMS with methyltriethoxysilane (MTES). Mechanical property measurements show that the elastomers thus formed exhibit superior tensile strength with respect to general room temperature vulcanized silicone elastomers containing silica. Moreover, investigations were carried out on the elastomers by extraction, scanning electron microscopy (SEM) and differential scanning calorimetry (DSC) measurements. SEM shows that the elastomer has a microphase-separated structure consisting of dispersed PMMA domains within a continuous PDMS matrix. DSC result shows that the elastomers display two glass transition temperatures and confirm the incompatible nature of PDMS and PMMA.

Abstract: A theoretical study on damping properties of multi-layered hybrid materials was presented with the aim to obtain good damping materials with a broad and high damping range. The value of the multi-layered organic hybrid materials consisting of polarized polymers and small molecules was evaluated via the correspondence principle. Similarly, the damping properties of the multi-layered organic hybrid materials were predicted according to our previous work. With increasing the number of the layers of multi-layered hybrids, the temperature dependence of could be improved and it was almost rectangular transition range with values for the area under the linear curve. Therefore, it could be considered to be a new approach to improve the temperature dependence of the damping materials and obtain good damping materials with a broad and high damping range.

Abstract: The thermal aging experiments on nitrile rubber (NBR) and modified NBR were carried out in 25# transformer oil. Both of the content of CH4, microstructure, morphology and mechanics characterization was analyzed by Gas Chromatography (GC), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and Servo Control material testing machine, respectively. The results shows that the amount of CH4 released from the modified NBR is less than original NBR, and the mechanics characterization of the modified NBR is also satisfied with the application requirements.

Abstract: Polyaniline (PANI), one of the most studied conducting polymers (CPs), shows great promising application in supercapacitor in advanced power system. In present work, the capacitance fading of PANI nanofibers modified stainless steel (PANI/SS) electrode was investigated by combination of cyclic voltammetry (CV) and scanning electron microscopy (SEM). The kinetics of capacitance fading can be fitted to a second-order exponential decay. The fading rate constant of the capacitors increases by two orders magnitude when the upper-limit potential in CV increases from 0.55 to 0.80 V vs. SCE. We proposed that there are three factors leading to the capacitance fading, the first one is the hydrolysis of quinoid units in PANI produced during electrodeposition process or/and high potential applied, the second one is chemical degradation of PANI induced by the attack of solvated anions on nitrogen radical cation, and the third one is the electrochemical degradation of PANI which is due to the benzene radical cation. Additionally, the SEM images show that the morphology of newly formed PANI nanofibers are in gel structure, and become clear with the gel structure disappeared after 1000 cycles. Moreover, some regular particles appear at the electrode surface, which are supposed to be produced from the accumulation of the degradation product.